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Gisborne District Council
Water Supply
Activity Management Plan
Activity Management Plan Gisborne District Council Table of Contents
n-49637 Page 2
Version Description of change Date Initial Draft 3 Draft for Kevin Strongman 7/10/08 jjt
Activity Management Plan Gisborne District Council Table of Contents
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2009-2019
TABLE OF CONTENTS
1. Overview ............................................................................................................ 5
1.1. Why we do it ............................................................................................ 5
1.2. What we do .............................................................................................. 5
1.3. Where we are now .................................................................................. 5
1.4. Where we want to be .............................................................................. 6
1.5. How we plan to get there ....................................................................... 6
2. What we do ........................................................................................................ 8
2.1. Activity Description ....................................................................................... 8
3. Why do we do it ............................................................................................... 10
3.1. Activity Rationale .................................................................................. 10
3.2. Strategic Environment ......................................................................... 11
4. Where we are now ........................................................................................... 16
4.1 How the activity has developed ........................................................... 16
4.2 Levels of Service .................................................................................. 17
4.3 Asset Information ................................................................................. 18
Environmental Consents ........................................................................................... 21
Gisborne City Water Supply (GCWS) ........................................................................ 23
Te Karaka Water Supply (TKWS) .............................................................................. 38
Whatatutu Water Supply (WTWS) ............................................................................ 42
4.4 Current Costs and Funding Policy ...................................................... 46
4.5 Key partners/stakeholders ................................................................... 47
4.6 Assumptions ......................................................................................... 49
4.7 Risk Management ................................................................................. 50
4.8 Negative effects .................................................................................... 51
5. Where we want to be .......................................................................................... 53
5. Where we want to be .......................................................................................... 53
5.1 Growth ................................................................................................... 53
5.2 Trends .................................................................................................... 56
6. How we plan to get there ................................................................................... 63
6.1 Options and Choices ............................................................................ 63
6.2 Implications ........................................................................................... 69
6.3 Preferred option .................................................................................... 72
7. Improvement Plan ........................................................................................... 74
Appendix A - Levels of Service ........................................................................ 79
Appendix B – Asset information ...................................................................... 82
Activity Management Plan Gisborne District Council Table of Contents
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Asset Info – Graphs ................................................................................................. 82
Asset Condition, Capacity/Criticality, Performance and Life ................................... 84
Appendix C – Financial Information .............................................................. 113
Appendix D – Risk Management Approach .................................................. 126
Appendix E – Asset Management Approach ................................................ 131
Activity Management Plan Gisborne City Council Overview
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1. Overview
1.1. Why we do it
To provide a constant, adequate, sustainable and high quality water supply to Gisborne’s
reticulated areas.
1.2. What we do
The Council provides reticulated water supplies for Gisborne City including parts of Manutuke and
Makaraka. Council also provides reticulated rural water supplies for Te Karaka and Whatatutu.
For these areas, Council owns and maintains the whole water supply network which covers:
Collection of raw water.
Treatment of raw water to produce suitable quality and quantities of drinking water.
Distribution of treated water to the point of supply to the customer, where it consistently meets
specific flow, pressure and quality standards. This includes water required for the city‟s
emergency fire fighting services.
Community outcomes
This activity contributes to the following community outcomes:
Connected Tairāwhiti Healthy Tairāwhiti
1.3. Where we are now
The Council maintains and/or owns the Gisborne water supply from its source supply, via water
treatment infrastructure to the water reticulation network, including the connections from the street
mains to all serviced property boundaries. At commercial metered connections, Council owns the
water meter and backflow preventer and charges for actual water used.
The water quality grading of Gisborne‟s reticulated water supply is currently being reviewed by the
Ministry of Health in accordance with the NZ Drinking Water Standards 2005. The last water quality
grading held by the Gisborne City water supply was an Aa grading.
The current water supply for Gisborne City is provided through seven distinct water sources. These
are:
Mangapoike Dam Catchment (Clapcott dam and Williams dam).
Te Arai River.
Waipaoa River.
Emergency bores - Cameron Road (2 bores) and Hansen Road.
Rural water supply sources include:
Waipaoa River bore - Te Karaka supply.
Mangatu River bore - Whatatutu supply.
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Council‟s two treatment plants, Waingake Water Treatment Plant and Waipaoa Augmentation Water
Treatment Plant are modern and designed to meet requirements of the NZ Drinking Water
Standards.
Te Karaka and Whatatutu are serviced with supplementary supplies. These services are provided to
“top up” tanks during periods of insufficient rainfall. Water usage is restricted to approximately
1000 litres per household per day and is controlled using a ball cock system.
The Gisborne City system provides water to communities adjacent to the Waingake bulk water main,
which includes the communities of Manutuke and Papatu Road. Parts of the Poverty Bay flats
adjacent to the Waipaoa bulk water main are also supplied.
1.4. Where we want to be
Gisborne District Council is committed to retaining an Aa water quality grading for the Gisborne
City water supply and to be in full compliance with the New Zealand Drinking Water Standards
(DWSNZ) and the Fire Fighting Code of Practice.
The Council is also committed to improving the water quality gradings for Te Karaka and
Whatatutu (subject to Government funding under Capital Assistance Programme [CAP]).
Have properly maintained the integrity of the reticulated water supply assets (DWS 2005).
Adequately extend the reticulated water supply to new subdivisions within Gisborne City and to
Gisborne‟s rural communities as appropriate.
Ensure adequate security of supply for Gisborne‟s water network.
1.5. How we plan to get there
Undertake DWSNZ compliance projects including Hospital Hill Reservoir chlorine circulation
improvements, the installation of UV treatment at the water treatment plants and the Te Karaka
and Whatatutu rural water supply upgrades, which are solely dependent on Government
funding under Capital Assistance Programme (CAP).
Undertake key strategic asset management and maintenance projects to maintain the integrity
of the reticulated water supply assets. Key projects include:
Water Asset Componentry Condition Assessment and Renewals Programme.
Clapcott Dam Supply main replacement.
Te Arai pipe bridge repairs
Hospital Hill reservoir sealing
Knob Hill reservoir sealing
Hospital Hill reservoir waveband
Undertake a capital works to bring areas identified as not meeting the Fire Fighting Code of
Practice into compliance. Projects include:
Selected upgrades of water mains.
Construction of a new ring water main between Makaraka and the Awapuni Road water
main.
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Implement a demand management strategy that will improve security of supply for the water
network. The strategy will focus on water conservation programmes and public education, leak
detection programmes and may result in capital expenditure projects, such as the increase of
the Williams Dam storage capacity or potentially the installation of universal water metering for
domestic consumers.
Continue to undertake a comprehensive programme of maintenance and renewals. This will
minimise the need for emergency repairs that impose a greater cost and inconvenience to the
community.
INCLUDES TEXT INSERTED FROM THE TEN YEAR PLAN ON 19 FEBRUARY 2009
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2. What we do
2.1. Activity Description
Overview of the Public Water Supply System
Factor Gisborne City Te Karaka Whatatutu Total
Population Served 41,922 543 280 42,745
Length of Reticulation (kms) 240.58 4.1 2.7 247.38
Pump Stations (no.) 8 1 1 10
Fire Hydrants (no.) 1508 0 0 1508
Replacement Value ($000) 143,007 275 151 143,433
Depreciated Replacement Value ($000) 89,080 116 33 89,229
No. of Connections 12,972 162 42 13,176
How Water Sourced Dams, Rivers Bores Bores
Annual Total Volume of Water Produced (m³) 5.79M 36,500 11,960
Average Daily Volume of Water produced (m³) (2006/07) 15,540 142 33
Annual Total Volume of Water Sold (m³) (2006/07) 1.95M 0 0
Water Supply Grading U U U
Average Consumption per Connection (m³/year) 300 221 204
The following area communities are reticulated by Council administered supplies:
• Gisborne City, including parts of Manutuke and Makaraka
• Te Karaka
• Whatatutu
The following area communities are reticulated by non-Council administered supplies:
• Te Puia Springs
The following areas are non-reticulated, private supply systems sourced from roof catchments,
ground water bores/springs or surface water.
• Matawai
• Muriwai
• Wainui / Okitu
• Makorori
• Tolaga Bay
• Tokomaru Bay
• Ruatoria
• Tikitiki
• Te Araroa
• Patutahi
• Tiniroto
• Ormond
• Hicks Bay
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The Gisborne City Water Supply
The Council maintains and/or owns the Gisborne water supply from its source supply, via water
treatment infrastructure to the water reticulation network, including the connections from the street
mains to all serviced property boundaries. At commercial metered connections Council owns the
water meter and backflow preventer and charges for actual water used.
The Gisborne City system provides water to communities adjacent to the Waingake bulk water main,
which includes the communities of Manutuke and Papatu Road. Parts of the Poverty Bay flats
adjacent to the Waipaoa bulk water main are also supplied
The design capacity for the system is 30,000m³ per day. Demand on any given day may exceed this
and theoretically the system could be run to 43,000m³ per day (30,000m³ Waingake and 13,000m³
Waipaoa).
The water quality grading of Gisborne‟s potable water supply is currently being reviewed by the
Ministry of Health in accordance with the NZ Drinking Water Standards. The last water quality
grading held by the Gisborne City water supply was an Aa grading.
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3. Why do we do it
3.1. Activity Rationale
The goal of providing a public water system is to ensure the health of the community thereby
eliminating the need for individuals to provide their own water system with much higher health risks.
In providing a public water system the objective is to effectively provide a quality, efficient and
environmentally acceptable system in a controlled and regulated manner. To provide those services
for the present needs with an overview of not constraining future generations to ensure sustainable
growth for desired levels of service.
Other significant corporate goals are to:
Comply with all legislation.
Comply with audit requirements.
Complete programmes as detailed in the Strategic Plan, Annual Plan, Estimates and Activity
Management Plans.
The Council‟s principal objectives are:
The water network assets contribute to the practical delivery of the Council vision and mission as
follows:
Preservation Provide a water supply to protect public health.
Provides a modern and convenient to use
reticulation system, recognising the finite nature
of the water resource.
Enhance
Environment
Protects the physical environment through the
treatment and discharge of effluent through
approved methods with appropriate consents.
Sustainable
Management
Through ensuring water is transported in a
sanitary manner to its point of use in an integral
and secure system.
Economic Base Facilitate the continuing development of both
private and business interests by providing the
underlying water infrastructure required to
support the economic base of the community.
Future
Generations
Maintain the asset base in perpetuity by
providing a water system on a commercial basis
to achieve efficiency, sustainability and
customer focus.
The Council has several roles with respect to water supply services:
to co-ordinate the setting of community outcomes to which the water supply of the Council
might apply
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to monitor and report the progress that is being made towards achievement of those
outcomes
to act as service provider for ensuring good quality and safe community drinking water
supplies the publicly reticulated water supply areas
to act when any potential health risks relating to the absence of, or proper management of,
water supplies are identified
ensure proper maintenance of the reticulated water supply assets, so that their service
capacity and integrity is not reduced
anticipate the time when it may be necessary to extend, upgrade or renew the existing public
water supply system, and to plan accordingly
to ensure that fire hydrants are installed in the reticulated areas, and that they are kept
charged with water.
The Council currently provides reticulated water supplies for Gisborne City, Te Karaka and
Whatatutu. Council previously promoted the reticulation of Ruatoria but this, following community
consultation is still being reviewed. Consultation and investigation of the Council being involved in
the private water supply at Te Puia is ongoing. There are no other plans at this time for Council to
reticulate any other community. The Council also maintains an advisory and educational role with
respect to the private onsite supplies.
3.2. Strategic Environment
This AMP has been informed by a strategic stocktake of all relevant Legislation, Government
Strategies and Standards, Council Bylaws, Strategies and Plans etc. All capital and operating
projects (both proposed projects and those subsequently programmed for delivery) have been linked
to their associated strategic documentation, a summary of which is provided in Appendix X
A summary of the most relevant strategic documentation is provided below.
Community Outcome(s) How the Water Supply Activity Contributes
Safe & Healthy Haven: (Freedom
from health risk and harm)
By ensuring that the water is:
safe to drink;
clear
delivered under pressure; and
that the service meets the defined fire
fighting standards
Positive Leadership: (Positive
stewardship and improvements in
infrastructure promoting
environmental sustainability)
Through investment in infrastructure
Connected Communities: (Access
to essential services)
Provides a modern and convenient to use
Water Treatment and reticulation system
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The activity manager should list and describe the relationship to or impact of these plans on the
activity.
The following lists the corporate strategies, statutory requirements, plans, bylaws and other
important external stakeholder documents and plans relevant to the Water Supply activity.
Statutory
Health Act 1956
Health (Drinking Water) Amendment Act 2007
Local Government Act 2002
Resource Management Act 1991
Plans & Bylaws
Water Supply Bylaw 2008
Public Health Risk Management Plans (City and townships)
Regional Plan
District Plan
Corporate Strategies/Goals
Urban Development Strategy
Urban Coastal Strategy
Development Contributions
Procedural documents/Standards/Best Practice Documents
Drinking Water Standards 2005 (DWSNZ:2005)
Quality Management System
Engineering Code of Practice
Water Supplies Action and reporting protocol EHO – Water Utilities Protocol 2008
Utilities Assets Maintenance Contract
Professional Services Contract for Engineering Projects
NZS4404 – Subdivision Standard
Infrastructure Management Manual
Several key drivers to the Water Supply activity have been listed below describing its relationship
and/or impact.
Health Act 1956
The Health Act 1956 provides legal authority for Council to be involved in the provision of sanitary
works. The key provisions in the Act are as follows:
Ensuring the provision in any dwelling house of an adequate and convenient supply of wholesome
water.
Section 29 (Power and Duties of Local Authorities: Local Authority: Nuisances) provides for the
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Council to deal with nuisance so situated as to be offensive or likely to be injurious to health.
Health (Drinking Water) Amendment Act 2007
The main duties in the Act are to take all practicable steps to comply with the (previously voluntary)
drinking water Standards and to introduce and implement public health risk management plans. The
Act commenced 1 July 2008. From this date all drinking-water suppliers will be required to apply to
the Ministry for registration on the drinking-water register.
The other duties come into force progressively as follows: The Health (Drinking Water) Amendment
Act 2007 makes special provision for supplies that provide water for both agricultural and drinking
water purposes, to ensure that they are not required to make fit for humans water that is only used
by animals or crops. These supplies fit into the “rural agricultural drinking water supply” category.
Supplies in this category face no duties under the drinking water standards until 1 July 2013 at the
earliest. The drinking-water standards will be amended to determine exactly how such supplies will
be managed, and the Ministry is seeking opinions on how this should be done.
Local Government Act 2002
The Act provides the power of general competence for a local authority to undertake any business or
activity given certain provisos. The Act places limitations on the private sector involvement in the
ownership of assets and the delivery of services and has a general requirement that local authorities
continue to provide and maintain their capability to provide water services.
Resource Managemant Act 1991
The act establishes a planning framework covering land designation processes, requirements for
resource consents for activities which affect the environment. Gisborne is a unitary authority and
performs the functions of both a District and Regional Council. Regional Councils are responsible for
granting resource consents. The Gisborne District Council appoints independent commissioners to
determine its own consents in order to avoid any possible conflict of interest. The changing
legislative environment and higher environmental standards may present some challenges to the
operation of the Water Supply Activity in the future. Council staff will continue to monitor and report
on these changing legislative and environmental standards.
Water Supply Bylaw 2008
The Bylaw establishes a local regulating framework specifically set out for water supply relating to
aspects of service such as:
Conditions of supply (point of supply, metering, Level of Service, etc.)
Continuity of supply (restrictions, emergencies, liabilities and scheduled maintenance or
repair)
Types of supply (definition of ordinary, extra-ordinary and restricted supply)
Protection of water supply (entry to water reserves)
Customer responsibilities (backflow prevention, payment of services, etc.)
Breaches, offences and disputes
Public Health Risk Management Plans
The principle purpose of the Public Health Risk Management Plans (PHRMP) is to identify potential
events that present public health risks to the water supply system. Through this identification,
mitigation can occur and contingency plans can be put in place. Also, an improvement plan to further
isolate or eliminate the likeliness of this occurring is there for implementation, but this is subject to
future funding. Fields include: Identification of event, cause, preventative measures, monitoring
requirements and corrective actions.
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Regional Plan
The Regional Policy Statement is the main vehicle for interpreting and applying the sustainable
management requirements of the RMA in a local context. It identifies key issues and objectives,
policies and methods to guide the development of the lower order planning documents such as the
District Plan.
The Regional Policy Statement recognises the issue of competing demands on water resources and
that demand often occurs when resources are low. It also recognises that water use is sometimes
inefficient. Competing uses are to be managed through the resource consent process. The plan also
states that Council will investigate the charging for the use of water as a method for improving the
efficiency of the use of water.
Gisborne District Plan
The purpose of the Combined Regional Land and District Plan (District Plan) is to assist the Council
to carry out its statutory functions (both regional and territorial) in relation to the subdivision, use
and development of land. It includes standards and policy relevant to the development of water
supply networks in subdivisions and other developments.
For example, it requires reticulated water to be provided in streets built within the Gisborne Urban
Boundary and for reticulated water to be designed in accordance with firefighting codes of practice.
It also sets out a network design for the development of water in the Taruheru Block.
Urban Development Strategy
The Urban Development Strategy is being developed to guide the sustainable development of the
Gisborne urban area over the next 20 years.
Due to limited growth and the need to protect the rural hinterland, one of the strategy‟s key
directions is towards a compact city which will limit the expansion of the water supply network.
Urban Coastal Strategy
To shape future coastal development trends, the Gisborne District Council has prepared the Urban
Coastal Strategy for the coastal areas in and around the Gisborne area. Its purpose is to guide the
development of residential, business and open space areas along the coastline.
Development Contributions Policy
The purpose of the Development Contributions Policy is to ensure that developers make a fair
contribution towards the cost of infrastructure and services associated with developments.
The Development Contributions Policy includes a charge for both residential and non-residential
water supply.
Drinking Water Standards 2005 (DWSNZ:2005)
The Drinking Water Standards (DWSNZ:2005) contain comprehensive information for owners and
operators to assist in the management of public and private drinking-water suppliers.
It details how to assess the quality and safety of drinking-water using the revised water quality
standards and compliance criteria (collectively called the DWSNZ) that came into effect from
31 December 2005.
The drinking-water standards apply to drinking-water, that is, water intended to be used for human
consumption, food preparation, utensil washing, oral hygiene or personal hygiene. The criteria are
applicable to all drinking-water except bottled water, which must comply with the Food Act 1981.
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Gisborne District Council Engineering Code of Practice
The Code describes engineering standards which Council believes provide acceptable solutions, but
not necessarily the only solutions, for the engineering works associated with subdivision and land
development. Council will impose conditions on Resource Consents, using the Code of Practice as a
reference document for acceptable solutions. This practice provides acceptable engineering
standards for the design and construction of drinking-water reticulation systems that are to come
under Gisborne District Council jurisdiction and/or ownership. The design and construction objective
is to distribute water for consumption and fire fighting which meets the appropriate standards and
level of service for these uses.
Quality Management System
The Quality Management System Manual explains how the Council Water Treatment facilities
operate. This manual includes procedures and supporting documents such as forms, templates,
flowcharts and training manuals relevant to the council‟s water utilities division.
Linkages & Information Flow Between Key Legislation
Changing legislative environment and higher environmental standards may present some challenges
to the operation of the Water Supply system. Council staff will continue to monitor and report on
these changing legislative and environmental standards.
Figure 3i below indicates the linkages and information flow between key legislation, policy and
planning documents that guide the Council‟s Water Supply Activity and other corporate plans.
Local Government Act Resource Management Act
Water Supply
Activity
Management PlanAnnual Plan
District PlanLTCCP
Capital
Expenditure
Plan
Operational
Plans
Monitoring and
review
PHRMP
Public
Consultation /
District Vision
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4. Where we are now
4.1 How the activity has developed
Background and Rationale for the Council’s Involvement
Gisborne‟s public water supply was originally installed in the early 1900‟s.
The Council maintains and/or owns the Gisborne water supply from its source supply, via water
treatment infrastructure to the water reticulation network, including the connections from the street
mains to all serviced property boundaries. At commercial metered connections Council owns the
water meter and backflow preventer and charges for actual water used.
The current water supply for Gisborne City is provided through seven distinct water sources. These
are:
Mangapoike Dams (2)
Te Arai River
Waipaoa River
Emergency bores: Cameron Road (2) and Hansen Road
Rural water supply sources include:
Waipaoa River: Bore – Te Karaka supply
Mangatu River: Bore – Whatatutu supply
Council‟s two treatment plants, Waingake Water Treatment Plant and Waipaoa Augmentation Water
Treatment Plant were upgraded and constructed as part of Government Grants, post Cyclone Bola,
and contributions from a water levy provided by the citizens of Gisborne.
The two plants are considered modern and designed to treat water to meet the NZ Drinking Water
Standards turbidity requirements of less than 0.5NTU. Water consistently below 0.1NTU is routinely
produced.
The City of Gisborne is served with numerous reservoirs. These exist to balance demand within the
reticulation, provide additional city storage for fire fighting purposes, and general city security.
In general the system from Mangapoike Dams is gravity fed however to meet peak demands booster
pumping from the Mangapoike Dams to Waingake Water Treatment Plant is required. Pumping is
required when abstracting water from the Waipaoa River. Generally flows from Waingake to Gisborne
are gravitational and only during high summer flows is booster pumping at the city boundary
required. All water from the Waipaoa Augmentation Plant is required to be booster pumped and
cannot rely on any gravity. Additional booster pumping within the reticulation is provided at the
Ormond Road Booster Pump Station to equalise supply demands in outer Kaiti, and to maintain
equilibrium between the Hospital Hill Reservoir and the Knob Hill Reservoir.
The Gisborne City system provides water to communities adjacent to the Waingake pipe line,
including the communities at Papatu Road and Manutuke township. Manutuke properties should be
top up supplies only, similar to Te Karaka and Whatatutu, but is yet to be enforced effectively. Once
enforcement has been achieved, it should help alleviate the low suction pressure issues experienced
at the Makaraka pump station at high summer flows. Parts of the Poverty Bay flats adjacent to the
Bushmere line are also supplied.
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Te Karaka and Whatatutu are serviced with supplementary supplies. These services are provided to
“top up” tanks during periods of insufficient rainfall. Water usage is restricted to approximately 1000
litres per household per day and is controlled using a ball cock system.
4.2 Levels of Service
Water
How the LOS were developed:
The LOS project was initiated after the completion of the 2006-2016 LTCCP when it became
apparent that Councils current LOS and performance measures were inadequate. Council identified
the need for clearly defined levels of service so that the Council is able to monitor and report actual
service provision against intended service provision.
This LOS project in its entirety will not be reported in this Activity Management Plan however the
initial stakeholder identification, LOS survey and the final performance measures will be.
In 2006 Utilities identified a list of all stakeholders with respect to the three water activities
undertaken. A selection of the larger users and those we new little about were chosen. We then
surveyed these groups to understand better what they valued from each of the three water activities.
When the results were summarised the following groupings of value propositions were identified for
the water activity:
Supply of clean and hygienic water
Maintain a constant supply of water
Have a good water pressure
Water to be free from offensive taste and odours
Produce water in an environmentally friendly manner
Have a quick response to any breakdowns
These value propositions were developed into a full LOS survey in 2007. This survey combined the
three activities undertaken by Utilities. These are the water, wastewater and stormwater activities.
These surveys were undertaken by members of the Utilities Team and comprised of “door to door”
surveys in the evenings with “on the street” surveys at a selection of Gisborne City business areas.
These business areas comprised of the CBD, Balance Street, Kaiti Mall and the Elgin shopping
areas.
Over 300 survey forms were collected for the three water activities with around 100 being from the
business areas and the remaining 200 being from a variety of residential areas. The residential
areas were spread geographically around Gisborne. This was so not to favour the areas where we
had recently undertaken work. The residential areas were also selected to have an even range of
socio economic neighbourhoods. That is we had low, medium and high socio economic
neighbourhoods evenly surveyed. Larger industries and commercial businesses were also separately
surveyed.
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The survey results showed that for the water activity that most important two value propositions for
the respondents in order of priority were overwhelmingly:
to provide a clean and hygienic water supply
to maintain a constant supply of water
to provide continuity of supply
The results of the survey were used by managers to assist them in describing their levels of service,
and to identify appropriate performance measures with targets from years 1-10. This will assist
Council to deliver on the strategic direction agreed upon.
The LOS review will align all the activity‟s that we do on a daily basis. It will assist the decision
making role of our elected members. This will benefit the community in which we serve.
Please refer to Appendix A for technical and customer related measures.
4.3 Asset Information
Asset Valuations Asset Group Current Value Annual Depreciation Life Remaining (years)
Buildings and Services
The water activity asset has a replacement cost of around $120M and requires a total $2.5M per
annum to maintain and operate the asset to meet the service outcomes required. The increase in
costs is attributable to inflation adjustments and minor variations in maintenance and operating
associated with the capital programme.
Key to maintenance and operation is the feedback received from consumers. A 24 hour 365 day per
year call out service is provided by Council to receive information from the public in regards to the
water supply. Complaints provide “soft” information on reticulation performance. Despite greater
community awareness of its water supply (and hence an expected increase in complaints) the
number of complaints has remained reasonably static since 1999 at around 10.
The public water supplies administered by the Gisborne District Council were each established at
different times. Until November 1989 the supplies were administered by two independent local
authorities then known as Gisborne City and Waikohu County. Each authority had different levels of
service and different standards for providing those levels of service. The Gisborne City supply had
the higher standard.
The day to day management of the Gisborne public water supplies is carried out by the Council‟s
Engineering and Works Department. The performance of this department and therefore the
performance of the water supply are monitored by the Gisborne District Council. Water quality of the
supplies is monitored by the Environmental Health section of Council and the MoH representative -
the Public Health Unit. These assessments are carried out against the NZ Drinking Water Standards.
Maintenance can be defined as that group of activities that preserve an asset in a condition that
allows it to perform its required function. The on-going efficiency of the routine maintenance is
critical to achieve optimum asset life cycle cost that best suit the desired levels of service.
Maintenance falls within the categories of unplanned and planned. Unplanned maintenance is
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reactive work, carried out in response to reported or observed problems and defects, to enable the
scheme to function. Examples of unplanned maintenance include repair of leaking pipes, tobies and
fittings and maintenance required as a result of civil emergency damage. Planned Maintenance is
work carried out as a preventive measure to improve asset reliability for achieving levels of service.
Examples of planned maintenance include lubrication of components or routine flushing of water
mains to maintain water quality.
Operations can be defined as the group of activities which are necessary for the functioning of an
asset but which have no effect on asset condition. Such activities include resources, staff,
consumable materials and energy but exclude maintenance work. Operations of Council‟s water
treatment plant are undertaken by Council‟s Engineering & Works department. The operation of
Council‟s water treatment plants are undertaken by Council‟s Engineering and Works staff. Routine
maintenance is completed under contract for the reticulation assets. The management of the
schemes is performed by the Gisborne District Council Engineering & Works and the majority of the
routine maintenance is performed by contract. Much of the operational activity is based on local
knowledge and experience of long serving staff and is now all but captured and formally documented
in operational manuals.
Design functions are contracted through Opus International Consultants as a result of a competitive
tender, which included transfer of some of Councils staff. This Contract has recently been extended
and expires 1 July 2006.
To maximise efficiency, consultancy input is obtained for some specific and specialist tasks.
Key Maintenance and Operating Issues
After significant treatment plant optimisation and efficiency changes, the key issues relating to the
Gisborne water supply are now considered to be:
• DWSNZ:2005 Compliance
Includes Te Karaka and Whatatutu Water Supply Upgrades (subject to TAP & CAP
funding)
• Demand Management Planning
• Strategic Asset Management
• SNZ PAS 4509:2008 Fire Fighting Compliance
• Asset Maintenance
Further details on all of these issues are in Section 6: Options and Choices.
Business Continuity / Emergency Management
The Civil Defence Emergency Management Act 2002 (the Act) (enacted December 2002) required
the Gisborne District Council to carry out three major activities. These were:
• To form a Civil Defence Emergency Management (CDEM) Group within six months of Act‟s
enactment, with agencies identified in the Act. The Gisborne CDEM Group was formed on 23rd
May 2003.
• The development of a CDEM Group Plan within 2 years of enactment. The Plan was adopted on
the 30th June 2003.
• The formation of a Co-ordinating Executive Group (CEG). The CEG was formed prior to enactment
on the 9th of November 2001.
As required by the Civil Defence Emergency Management Act (CDEMA) 2002 Council has developed
a co-ordination team to consider the business continuity, lifeline and incident responses.
This team has produced a lifelines document that outlines Council's response should an event occur.
In support of this document a risk analysis of the water utility network has also been completed. The
water utility is part of the annual civil defence simulation exercise that regularly tests our emergency
preparedness. These simulations will be the basis for future plan development.
Activity Management Plan Gisborne District Council
n-49637 Page 20
Identified in the development of this Activity Management Plan, there are proposed projects to
facilitate the establishment and implementation of numerous response and management plans.
These are additional to recommendations made in past Activity Management Plans and are currently
included in the improvement plan:
• Emergency Response Plan
• Demand Management Plan
• Drought Management Plan
• Algae Management Plan
Further detail is included in Section 7: Improvement Plan.
Environmental Management
The Waingake consent for the water take at the dams is covered by an existing use right that is
specified to expire in 2035. Currently, there are no take restrictions other than a requirement to
manage the river to ensure a minimum flow of 10 litres per second and there are no plans to
produce a management strategy for this river; but there is a proposed legislation called the “National
Environmental Standard for Measurement of River Takes”. If this comes into effect, it may have a
bearing on the minimum flow levels on the Te Arai River and Mangapoike Dams overflow stream.
The following conditions are put on the discharge from water supply reservoirs or pipelines (a
permitted activity) by the Regional Plan.
“The discharge of potable water into fresh water from any water storage reservoir, or water supply
pipeline, excluding domestic storage and pipelines, which does not contain:
• Disinfectants, or antiseptics, except not more than 0.3mg/l or free or combined residual
chlorine; or
• Not more than 1 mg/l of fluoride; or
• More than 50mg/l of suspended solids
shall be a permitted activity provided that the discharge complies with the conditions below.
Conditions:
1. The Gisborne District Council is notified at least 48 hours prior to any such discharge
2. The discharge shall not cause any erosion at, or downstream of, the discharge point
3. The discharge does not alter the natural course of the river or stream.
Environmental Monitoring and Reporting
The ground water takes associated with the Te Karaka and Whatatutu bores and surface water takes
are subject to a monitoring programme. No restrictions on groundwater consents apart from draw
down limits are in place. River levels are managed to ensure minimum residual flows are
maintained.
Council‟s actual performance in relation to the conditions of the resource consents is reported as per
the individual consent conditions. Reporting is to the regional regulatory staff, who can issue
compliance or abatement notices if consent conditions are not being met.
Water take volumes from the bores and the river takes are reported to the Environment and
Planning Department at various intervals. This data is reported into the State of the Environment
report produced annually by Council.
Discharge monitoring data is reported at monthly intervals following testing, this report is supplied to
the consent authority for review and compliance.
Environmental monitoring of the dam catchment is undertaken by council staff and contractors.
Rainfall, dam water quality, catchment sanitary surveys and security are all regularly monitored on
various programmes. Our environmental and catchment monitoring is in need of review to align with
new MfE and MoH source water criteria.
Activity Management Plan Gisborne District Council
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Environmental Consents
Resource Consents (‘Rights to Take’ and Discharge Permits) Already Held or Being Sought
Plant or
Area Type of Consent
Consent
Number Date Issued Expiry Date Quantities Comments
Whatatutu Water take WP203088A 9/02/2004 30/06/2014
Take 104m³ of
water per day from
underground
Te Karaka Water take WP-2008-
8071-00 02/05/2008 30/6/2014
Take 300m³ of
water per day from
underground
Waipaoa
WTP
Take water from
Waipaoa River WP201014A 5/06/2001 30/06/2011 12,960m³ per day
Take water from
Waipaoa River WP201015A 5/06/2001 30/06/2011 13,392m³ per day
Cameron
Road
Take water from
underground
WP-2008-
4340-00 04/04/2008 30/06/2013 4320m³ per day
Take water from
underground
WP-2008-
4341-00 07/04/2008 30/06/2013 4320m³ per day
Hansen
Road
Take water from
underground
WP2008-
4306-00 07/04/2008 30/06/2013 2600m³ per day
Waipaoa
WTP
Discharge
sludge DW198004A 20/07/1998 31/12/2008
Application for
consent renewal
being processed
Discharge
sludge DW198002A 20/07/1998 31/12/2008
Application for
consent renewal
being processed
Waingake
WTP
Discharge
supernatant DW197011B 20/01/2000 31/12/2008
Application for
consent renewal
being processed
Discharge
sludge DW197012B 20/01/2000 31/12/2008
Application for
consent renewal
being processed
Waipaoa
WTP
To construct
emergency
intake
RW199014A 28/05/1999 28/05/2029
Property Designations
The Gisborne District Council District Plan contains a schedule of designated sites. Not all water
network activity sites are designated in the District Plan, and further research and investigation is
required to determine whether additional site designation is required. Future expansion of site
designations in the District Plan has yet to be addressed, and is not currently a priority. Major new
asset sites are considered for designation as they are acquired.
The water supply network sites currently designated in the District Plan include:
• Reservoirs
• Water works purposes sites
• Water supply pump stations (some)
The water supply catchments above the dams are protected by QE2 Park status.
Activity Management Plan Gisborne District Council
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Property Easements
Few easements exist for the water supply network as the majority of the reticulation is on public
land. In the few areas where private land is crossed some of these are covered by easement and
some simply rely on the provisions of the LGA 2002 for access and authority.
Asset Retirement / Disposals etc
Currently there are no known disposal issues relating to assets, normal accounting procedures are
followed where existing assets are renewed and the old assets are disposed of. No assets have been
identified as not being replaced when their economic life has been reached.
There is room for improvement in the programming of these renewals and some new projects reflect
alleviating this:
• Asset Componentry: Overall Strategy
• Condition Assessments: Pipe Bridges
• Condition Assessments: Pipe
There are no current plans to dispose (sell) any part of the existing wastewater system, the new
treatment plant has the option to allow private involvement but this has not been decided nor
formally discussed and is not factored into this plan.
The Supply of Water for Fire Fighting Purposes
In October 2006, Utilities commissioned OPUS Consultants to construct a detailed hydraulic model
of the city of Gisborne. The scope of work included the following:
Hydraulic Model – Construction and Verification
Scenario Testing
Study Documentation and Model Handover
This model now supersedes the Beca Stevens report (Overview of Gisborne Water Network Analysis)
and has been predominantly used to ascertain the effect that large additions to the water network
will have when the scenarios are run in the model programme. The Growth Scenarios already studied
are the Western Industrial Ring Main and Wainui and Okitu Growth.
Within the model lies the basis for the future improvements and also an understanding of the
present condition, capacity and performance of the water network also relating to Fire Fighting flows,
but in order to finalize all recommendations on this subject, the calibration of the water model must
be completed first. This is programmed for 2009/10. It is important to note that until the verification
of the Hydraulic model is completed, all recommendations and monies will come from the BECA
report..
This work is in need of review in the light of the most recent issue of the fire service Fire Fighting
Code of Practice.
Areas identified as not meeting the Fire Fighting Code of Practice will be included in capital upgrade
programmes as appropriate. Existing work programmed includes:
• Fire flow capacity enhancement in 2008/09.
• A ring main to the Western Industrial area to boost capacity and fire fighting ability in 2011/12-
2012/13.
Further detail is included in Appendix C: Financial Information.
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Gisborne City Water Supply (GCWS)
GCWS Collection/Source: Overview
HC Williams Dam
HC Williams is the largest dam in the network. Its condition remains good and ongoing monitoring is
occurring to monitor its performance. Summary details are given in the table below.
Clapcott Dam
Clapcott is the oldest of the three dams and the only concrete structure, (Williams and Sang both
being earth dams). This dam despite leaks is in good condition. A regular monitoring programme is in
place to monitor condition. Summary details are given in the table below.
Sang Dam
Sang Dam is the smallest of the three supply dams which feed the Waingake Water Treatment Plant
and acts as a header supply dam for the Clapcott Dam. The Sang Dam has a manual valve to allow
the discharge from it into the Clapcott Dam. An automatic siphon exists on the Sang Dam to siphon
excess flow from spilling down into the Clapcott Dam and discharges into the Mangapoike River.
Summary details are given in the table below.
Waingake Supply Dams
HC Williams Clapcott Sang
Capacity 2,291,864 m³ 1,121,365 m³ 347,568 m³
Useable Capacity 1,833,600 m³ 896,500 m³ 347,568 m³
Construction Earth Unreinforced concrete Earth
Date constructed 1974 1948 1972
Elevation (TWL) 473.50 m 472.89 m 514.65 m
Maximum depth 14.25 m 11.6 m 8.6 m
pH 7.8-8.0 7.6-7.7
Turbidity 0.7-1.0 0.7-1.0
Consent 30/6/2013 WP91002 30/6/2013 WP91005 30/6/2013 WP91003
Legal description Lot 1 SO 2163
Pt 2C SO 4299 CT 97/32
Pt 2C SO 4299 CT 97/32 3B1
and PT3B2 SO 4299 CT97/32 Pt 2 Sec 8 SO 6157
Summer water temp 19 C 19 C Empty
Summer oxygen levels 7.2-7.8 g/m³ 7.0-7.8 g/m³ Empty
Catchment area 254.9 ha 148.9 ha 41.1 ha
Replacement cost ($000) $10,330 $12,205 $2,393
Average annual rainfall 1,920 mm 1,920 mm 1,920 mm
Compressed air
(de stratification) Yes Yes No
Telemetry monitored Yes Yes No
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0
500
1000
1500
2000
2500
Sang Dam Clapcotts Dam Williams Dam
Storage capacity
Minimum acceptable
storage at peak demand
Actual historical storage at
peak demand
Te Arai Bush Catchment and River
This catchment is unique to the majority if not all other water catchments within New Zealand. This
uniqueness comes from its size 1100 Ha of original native bush vegetation, the minimum size for a
self sustaining population to survive and that council owns and controls 100% of the catchment
area.
This source supplies the majority of water for the Waingake Water Treatment Plant and is the “jewel
in the crown” of our collection system. Summary details are given in the table below.
Waipaoa River
The Waipaoa River has the 2nd highest sediment loading per volume in the world and is the major
water body in the southern half of the Gisborne region. The sediment loading poses challenges for
treatment that has been overcome so that the Waipaoa is an essential augmentation supply source.
Summary details are given in the table below.
Waipaoa Te Arai
Summer Winter Summer Winter
Average flow (Daily mean) 70,920 m³/hr 212,112 m³/hr 150 m³/hr 750 m³/hr
Turbidity (Daily mean) 3.5 NTU >5 NTU 0.9 NTU >5 NTU
PH 7.8-8.1 7.8-8.1 7.8-8.4
Hardness 150-310 g/m³ 150-310 g/m³ 90-120 g/m³ 90-120 g/m³
Extraction up to 540 m³/hr up to 540 m³/hr 100-200 m³/hr 500-600 m³/hr
Rationing likely Yes No No No
Catchment area (Bolitho Road) 2,000 km2 1,072.45 ha
Land use
- Forestry 28.0% 28.0%
- Horticulture 2.0% 2.0%
- Agriculture 70.0% 70.0% 5% 5%
- Other 95% 95%
Extraction right 540 m³/hr 540 m³/hr No restriction No restriction
GCWS Collection/Source Pump Stations: Overview
Damline Booster Pump Station
Damline Booster Pump Station (Damline) is situated below the HB Williams and Clapcott Dams
immediately below where the pipelines from the two dams join. Under full gravity from the Dams a
maximum of around 500m³/hr can enter the Waingake Water Treatment Plant; with Damline
Activity Management Plan Gisborne District Council
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Booster Pump Station (DBP) operating this can increase to around 1000m³/hr. DBP has a very high
criticality in the supply of potable water to the city during the summer period.
Fairview Booster Pump Station
Fairview Booster Pump Station (Fairview) is inline after Damline. Fairview is used to put additional
water into the Waingake WTP during peak demands. With Damline operating the maximum flow from
the dams is 1000m³/hr with Fairview this can be increased to 1200m³/hr.
Fairview has a very high criticality in the supply of potable water to the city during the summer
period.
Waipaoa Intake Pump Station
These pumps extract water from the Waipaoa River and pump into the sedimentation ponds. These
pumps are considered part of the supply system. Two pumps are permanently on duty and act in
tandem while a third stays on stand-by should a fault occur. Pump duty is rotated.
The pump station is housed in a 5m well on the river side of the stop banks of the Waipaoa River. A
ramp out to the pump station provides free board from any potential flood waters and provides
access to the pumps. The pumps in the dry well are designed to be submerged should that occur.
The Waipaoa Intake Pump Station (WIP) extracts water from the Waipaoa River, over the Waipaoa
stop bank intercepting ponds before water treatment. Two T-wedge wire screens have been
constructed in the bed of the Waipaoa River and provide some pre-filtering before the take. The
wedge wire screens are backwashed with the use of air, and is based on a measured head loss
and/or time, and can operate and maintain flow to the sediment ponds during backwash.
A large concrete tower has been constructed within the flood channel of the Waipaoa River, and
extends down to the bed level and up to and above the top of the flood bank. The pump station
houses three split case pumps, three variable speed drives, a compressor and an extraction fan.
Internal walkways provide safety access from the top down to the pumps and the design is such that
the pumps can be submersed and still be operated.
Emergency Bores
These pumps were installed during the Cyclone bola Civil Defence emergency in 1988. These pump
stations have been kept so as to provide an emergency supply should all surface water sources
become inaccessible (e.g. volcanic activity). These pumps are undersized and not capable of
supplying Gisborne‟s normal demand. In the unlikely event that these bores should be required,
supply will be restricted and rationed.
Pump Station
Ye
ar
Bu
ilt
Ye
ar
Up
gra
de
d
De
scri
pti
on
Co
nd
itio
n¹
Cri
tica
lity
¹
Re
ma
inin
g L
ife
Nu
mb
er
of
Pu
mp
s
kW
of
ea
ch
Pu
mp
To
tal C
ap
acit
y
(m³/
da
y)
Damline Booster – overall 1975 1993 1 5 29y 2 150/185 24,000
Mechanical Pumps 2
Building Building 2
Electrical / Telemetry PLC/Radio 1
Fairview Booster 1984 1994 2 5 38y 1 150 4,800
Mechanical Pumps 2
Building Building 2
Electrical / Telemetry PLC/Radio 2
Waipaoa Pumps 1990 1 4 55y 5 30 17,280
Mechanical Pumps 2
Building Building 1
Electrical / Telemetry PLC/Radio 1
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Pump Station
Ye
ar
Bu
ilt
Ye
ar
Up
gra
de
d
De
scri
pti
on
Co
nd
itio
n¹
Cri
tica
lity
¹
Re
ma
inin
g L
ife
Nu
mb
er
of
Pu
mp
s
kW
of
ea
ch
Pu
mp
To
tal C
ap
acit
y
(m³/
da
y)
Cameron Road Bore 1 1988 1996 1 2 39y 1 140 4,320
Mechanical Pumps 3
Well 97m 10m300mm screen 3
Building
Shed 2
Electrical / Telemetry PLC/Radio 3
Cameron Road Bore 2 1988 2 2 39y 1 4,320
Mechanical Pumps 3
Well 100m 10m300mm screen 3
Building Shed 2
Electrical / Telemetry PLC/Radio 3
Hansen road Bore 1988 2 2 39y 1 2,590
Mechanical Pumps 3
Well 87m 10m300mm screen 3
Building Shed 2
Electrical / Telemetry PLC/Radio 3
1Key:- 1 = Very Good
2 = Good
3 = Moderate
4 = Poor
5 = Very Poor
or Not Critical
Low Criticality
Moderate Criticality
High Criticality
Very High Criticality
Site Damline
(P1)
Damline
(P2)
Fairview
(FVB)
Waipaoa
Intake
(WPB)
Cameron
Road No. 1
Cameron
Road No. 2
Hansen
Road
Pumps 2 1 3 1 1 1
Type split case split case submersible submersible submersible
Make Harland WEIR PUMPEX PLEUGER
Model SDA10/10 SDA300/400 SDA250/300 KP203T-
4290
P104-3-V10-
70
Capacity 950m³/h 1000 m³/hr 200 m³/hr 396 m³/hr 234 m³/hr
Rated output 150 kW 185 kW 150 kW 30 kW 140 kW 75kW
Amps 255 313 252 54 -
Purchased 1993 10/94 23/5/91 1988
Installed 1993 10/94 23/5/91 1988
Hours (Total)
Overhauled 7/96
Reinstalled 7/96
Hours (since
overhaul)
Pump control PDL PDL DOL PDL PLC
Power Supply 3 phase 3 phase 3 phase 3 phase 3 phase 3 phase 3 phase
Activity Management Plan Gisborne District Council
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Combined 950m³/h 1000 m³/hr 1200 m³/hr 1+2 or 3
820m³/h
1 and 2
234 m³/hr
Duty Spare Well 2 Well 1 Duty Stand-by
Telemetry Yes Yes Yes Yes Yes Yes Yes
GCWS Treatment: Overview
Waingake Water Treatment Plant
The Waingake Water Treatment Plant commenced an upgrade prior to Cyclone Bola of March 1988
when three rapid sand filters were installed to increase water quality. Following Cyclone Bola there
was additional upgrading with two additional filters and relocation of the water treatment building to
the upper settling tank. This was completed at an approximate cost of $8M. The upgrade was
funded largely by Government grant as a recovery from Cyclone Bola, but included money from a
reserve funded from a water levy.
The Waingake Water Treatment Plant still remains one of the newer and well run plants in New
Zealand and the last Grading held for the Gisborne City Water Supply was an Aa Grading; the highest
possible. Winter flows average 12,904 m³ per day, peaking to an average summer flow of 20,006
m³ per day. The Waingake Water Treatment Plant can produce a maximum outlet flow of 31,000m³
(1,290m³/hr) but could not sustain this for a long duration because of several limiting factors. These
include:
Variable Te Arai Stream flows – Summer (time when large flows are required) usually have
low stream flows.
Variable Te Arai Stream quality – large flows usually mean higher turbidities untreatable by
the Waingake Water Treatment Plant.
Makaraka suction pressure operational restraints.
Water consumption demand in the city.
The likely maximum for a long duration is 29,000m³ per day. The plant has a reasonable level of self
sufficiency. Enough treatment chemical is held on site to operate for a minimum of one month.
Power supply is the limiting factor should mains power be unavailable. The site has emergency
power generators that run on diesel, enough diesel is held for between 3 and 5 days operation.
As part of the process the addition of lime for pH adjustment occurs at this site, with the lime being
stored in a silo and provides approximately six months of lime. Chlorine and fluoride are added to the
filtered water before discharging to Gisborne. Backwashing of filters is undertaken by gravity, from a
500 m³ high level storage tank, combined with compressed air to agitate and clean the filters.
Historically, substantial noise problems were present on site whenever the air compressor was
operated during backwashing. After installation of mufflers, this has reduced the noise considerably
and has hugely improved the working environment at the Treatment Plant.
An intermediate tank at the start of the distribution main exists and is called the clear water
reservoir with a capacity of 1,000m³ and acts as a balance tank between the City demand and the
treatment plant, and is necessary to allow operational changes to the treatment plant to meet
increased demand within the City. The clear water tank also acts as a buffer should operational
problems occur, causing a reduction in water quality and allows scouring of the water should an
unacceptable deviation from the NZ Drinking Water Standards occur. Additional security is gained
from the length and therefore time that it takes for water to be transported through the pipes from
the Waingake Water Treatment Plant to Gisborne, and generally provides a minimum additional
buffer of six hours before reaching the City.
Since commissioning, the Waingake Water Treatment Plant has been fine tuned to optimise the
operating regime and is also focused on future trends with changes in water quality. This is always
ongoing as a more efficient and effective way of operating the Treatment Plant will benefit all parties
from operations staff to customers. Also, any changes that can be incorporated to meet anticipated
future standards without any significant cost have been included over the last three years. An
indication of this is the current outward turbidity levels which Council is consistently meeting the NZ
Activity Management Plan Gisborne District Council
n-49637 Page 28
0.1 NTU Drinking Water Standards and has aligned with the likely future standards set by EPA and
WHO. The additional treatment to achieve this we believe also provides additional microbiological
protection.
Historic problems with the existing clarifier at high flows have been noted. During these flows
material on the bottom of the sediment tank is picked up and re-suspended, causing a carry over
onto the filters and resulting in a major reduction and through put for the treatment plant. As a result
of the inadequate performance of the clarifier, Council has trialled successfully the use of direct
filtration polymers, annual cleaning before the busy summer season begins and has overcome the
operational problem of the clarifier.
The Waingake Water Treatment Plant is seen as a critical and strategic asset and as a consequence
receives high level maintenance, high level on line and off line monitoring, high alarm annunciation
on all aspects of its operation and ready response from appropriately trained and qualified water
treatment operators and repair contractors.
Areas where issues of plant performance need investigation include;
Clarifier performance and efficiency
Backwash water availability
Dam water availability and condition
Filter performance
The site has two full time attendants who live on-site but expansion of the telemetry system has
been undertaken with a view to allowing more operational freedom of the operators and to gain
further efficiencies. Currently the total number of operators within the Gisborne District Council is
three plus one Cadet also utilised as a part time operator. These staffing levels are generally well
below those of similar type plants, and reflects the high level control and use of automation and
telemetry monitoring.
Waipaoa Augmentation Plant
As part of the Government funding for the upgrade of the Gisborne Water Supply, the Government
required additional security of supply to Gisborne by the use of an alternative water source. This was
provided with the construction of the Waipaoa Augmentation Plant which has been designated as an
augmentation plant, and is operated on an intermittent basis. Its main purpose is to provide a
backup in the case of an emergency where the loss of water supply occurs from the Waingake Water
Treatment Plant, but has also provided additional capacity for future expansion and demand within
the reticulation.
The Waipaoa River is highly loaded with sediment and the plant has accordingly been designed to
cope with very high turbidity and sediment loading. As a result water is extracted from a twin wedge-
wire intake that is constructed in the river bed and is pumped to two settlement ponds which
provides 24 hour settling before again being pumped to the filters for treatment.
A large generator provides sufficient power to ensure operation continues regardless of a major
power failure.
The river intake pumps are stationed within the floodway of the Waipaoa River, built close to the stop
banks and designed to handle all flood events within the Waipaoa River. The pumps are housed in a
12 m deep chamber with the pumps being at river level, all electrical equipment at the top of the
chamber and above the stop bank levels. A walkway exists to provide access from the top of the stop
bank to the pumping station. The pump station is approximately 300 m from the Water Treatment
Plant.
The settlement ponds provide 24 hour storage at 540m³/hr; they have been designed to above all
known flood levels, and have a dirt embankment with both a concrete wall and base. The total
capacity of each pond is 7,000m³. Water is extracted from the settlement ponds by the pre-
sedimentation pumps, which pumps water to a balance tank to reduce surcharging of water into two
Activity Management Plan Gisborne District Council
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circular clarifiers. The clarifiers are provided for coagulation, the removal of bulk sediment. One of
the circular clarifiers also provides the additional use for the removal of hardness. From the two
circular clarifiers water is gravity fed to four deep bed rapid filters, similar to those used at the
Waingake Water Treatment Plant. Water is then pumped from the discharge sump from the filters to
a clear water reservoir, of 500m³ capacity which acts as a buffer between the demand from
Gisborne and the operational requirements of the treatment plant. Two major pumps are located in a
separate building to pump water from the clear water reservoir to the City of Gisborne, and have
been designed to meet all consent conditions relating to noise.
The addition of a treated water bypass line, which was installed in 2006/07, is able to re-direct
treated water back into an early stage pre-treatment pond using the City pumps and is there to
stabilise water from the filters to achieve optimal treatment conditions before being sent into the
reticulation system.
The plant is currently run with one operator stationed on-site; it is highly automated and linked with
Council‟s telemetry system. A broadband communication link between the Waipaoa Augmentation
Plant and the Waingake Plant enables the operators to remote control and remote alarm
annunciation, should it be required.
GCWS Distribution: Overview
Distribution Reservoirs
Council has three main reservoirs, Taumata, Knob Hill and Hospital Hill which provides approximately
one and a half days storage in summer and five days storage in winter. There are also a number of
small storage reservoirs within the system in order to meet demand in geographically high areas of
the city.
Major Storage
Hospital Hill - 38,000 m³
Knob Hill - 8,800 m³
The Hospital hill and Knob Hill are Gisborne city‟s primary storage facilities. Hospital hill is broken
into two cells, North and South and hold approximately 19,000m³ in each. In winter this gives
approximately 2.5 days storage. In peak summer this can drop to around 1 day. Hospital Hill is able
to supply the entire city but principally feeds the Western parts including the industrial, commercial,
and a significant portion of the domestic consumers. Knob hill principally services the Eastern area
of Kaiti and Tamarau but also contributes water flow to the CBD and port area.
These reservoirs are highly critical as they provide the buffer of primary storage from the plants to
the consumers and allow an even maintenance of pressure within the reticulation.
Hospital Hill Reservoir
The Hospital Hill Reservoir is the newest, has the greatest storage capacity and is a critical asset to
the overall performance of the reticulation system. The reservoir is divided into two cells,
independently valved and operated with one pipe feeding water in and out of the two cells. Level
control is with altitude valves requiring small hydraulic pumps to ensure adequate closure. Council
has made provision for an additional storage cell to be constructed on this site, but it is not
envisaged at this time that this will occur within the planning horizon of this Activity Management
Plan.
Knob Hill Reservoir
The Knob Hill Reservoir is a circular tank constructed of pre-cast, pre-stressed concrete and
operates with an internal float with water being delivered to and from the reservoir through one pipe.
This site is telemetered for water levels.
Activity Management Plan Gisborne District Council
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Taumata Reservoir
Built in 1933 Taumata is the oldest and highest reservoir in the reticulation system. It performs
adequately for the emergency purpose it serves and is not used in day to day operation. Water is
checked weekly and turned over monthly to maintain quality.
High Level Storage:
Approximately 20% of the area of Gisborne residential area resides on the surrounding hills,
bordering onto the Gisborne City flat land. In certain locations these properties are close to the
hydraulic grade line and result in diminished levels of service as a result. In a large number of cases,
on-site storage is required to ensure continuity of supply. To increase the levels of service and to
meet higher levels of compliance with the fire service code of practice, high level storage tanks have
been placed in strategic areas. These high level storages are located at Hill Road, Hauroa Road,
Gaddums Hill, Einstein Street and Pah Hill (Wallis Road). They are generally constructed from normal
domestic tanks and are banked together to provide the required storage. Additional booster
pumping is required from a holding tank for all high level storage except Einstein St.
High Level Storage
Pah Hill Tanks (5) – 136.2 m³
Einstein Street Tank (1) - 22.7 m³
Gaddums Hill Tanks (4) - 90.8 m³
Hauroa Road Tanks (4) - 90.8 m³
Hill Road Tanks (4) - 90.8 m³
In some cases water will fill the tanks under gravity and in some cases additional booster pumping is
required from a holding tank to the upper tanks, either for a combination of filling the upper tanks or
meeting the fire service code of practice.
Hauroa Road High Level Storage
Hauroa Road tanks service the houses in Hauroa Road. It is a dual system, with water feeding two
upper level tanks and two lower tanks which provide additional capacity utilised for fire fighting
requirements. Booster pumping is required for fire fighting purposes. Generally the upper tank
provides all necessary water. The lower booster pump is operated on a monthly basis as part of the
normal maintenance checks and is required to run for approximately one hour. This system is seen
as a critical component to the operation of reticulation and meets Council‟s legal obligations for fire
fighting purposes and ensures levels of service are maintained.
Gaddums Hill
Gaddums Hill has two upper tanks and operates on identical basis to the Hauroa Road system, in
this instance the pump is required to pump water to the upper tanks with the two lower tanks
stationed beside the pump station to act as storage for fire fighting purposes and are filled under
gravity.
Pah Hill High Level Storage Tanks
The Pah Hill tanks are stationed above the highest house at the top end of Wallis Road and consist
of five interlinked domestic house tanks, with water being pumped to them from a pump station
located beside the Knob Hill reservoir. The Pah Hill tanks form part of a proposed remediation for low
pressure in Oxford Street. Additional tanks as part of fire-fighting capacity upgrade is planned.
Further detail will be provided as part of the detailed design at that time. This system is considered
in excellent condition.
Einstein Street Upper Level Tanks
This tank is a 25 m³ plastic tank. Water is fed to the tank by gravity, generally at night when system
pressures are high, and back feeds water into the upper Einstein Street area during high peak
periods. Generally the combination of reticulation pressure and tank pressure provides adequate
levels of service. Regular inspections are undertaken on a weekly basis.
Activity Management Plan Gisborne District Council
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0
5
10
15
20
Taumata Nob Hill Hospital
Hill North
Hospital
Hill South
High level
storage
00
0's
m3
Storage capacity
Minimum acceptable storage
at peak demand
Actual historical storage at
peak demand
GCWS Distribution Pump Stations: Overview
Waipaoa City Pumps
The Waipaoa City pumps located in the Filter Pump Station at the Waipaoa Augmentation Plant,
deliver water from the clear water reservoir to the City of Gisborne. It has a maximum capacity of
720 m³/hr during emergency conditions but normal maximum operation is 540 m³. As part of the
overall consent operation of the plant, the pumps are designed to provide four set flow rates, these
are:
180 m³/hr
360 m³/hr
540 m³/hr
720 m³/hr (emergency provisions)
These pumps are in very good condition which reflects the minimal usage these pumps have had.
These pumps have a very high criticality rating.
Makaraka Booster Pump Station
This pump station is a highly critical, well maintained facility. This pump station can allow full gravity
flows or operate with pumps in parallel as shown in the diagram above. During full pump operation it
is possible to create negative pressure on the suctions side of the pump and hence is carefully
monitored and operated within defined parameters. Apart from a battery back-up for the telemetry
system, there is no stand-by power facility for the pumps available during power cuts on site, but the
power system is capable of having a generator connected. This was last successfully utilised during
the Y2K changeover and required an electrician for several hours.
Ormond Road Booster Pump Station
The Ormond Road Booster Pump Station was constructed in December 1998 to service low pressure
areas in outer Kaiti. Previously this had the potential to drain the full capacity of Knob Hill reservoir.
The pump station is in a chamber below ground to reduce noise, and to align with the existing
distribution main. The whole pump station is within road reserve and only the control cabinet is
above ground to provide easier access and overcome issues relative to ventilation for heat control.
Apart from a battery back-up for the telemetry system, there is no stand-by power facility for the
pumps during power cuts on site, but the power system is capable of having a generator connected.
This was last successfully utilised during the Y2K changeover and required an electrician for several
hours.
Taumata Reservoir Pump Station
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The Taumata Reservoir pump station was commissioned in 2005/06 to help with the process of
filling Taumata Reservoir on an operationally efficient basis.
Historically, the process involved Fulton Hogan contractors to valve off certain parts of the City
reticulation to gain enough flow to fill the reservoir on the hill behind Gisborne Hospital. As a result of
sending water to one area of the City, this in turn created the problem of high water pressures in the
reticulation.
The pump station is located in the dangerous goods shed in the rear of the Tairawhiti District Health
property. It has no remote access or control capabilities due to the fact that it is run only to flush/fill
the reservoir. The pump is also a diesel run pump so power issues are not relevant apart from the
battery charger used to start the engine.
Gisborne High Level pump stations
Gisborne Water Supply also has four high level pump stations to boost supply into the higher areas
of the town to meet fire fighting standards. The details of these pump stations are shown in the table
below.
Pump Station
Ye
ar
Bu
ilt
Ye
ar
Up
gra
de
d
Co
nd
itio
n¹
Cri
tica
lity
¹
Re
ma
inin
g L
ife
Nu
mb
er
of
Pu
mp
s
To
tal C
ap
acit
y
(m³/
da
y)
Makaraka Booster 1980 1993 1 5 34y 3 26,400
Mechanical 2
Building 1
Electrical / Telemetry 1
Ormond Road 1998 1 3 52y 1
Gis. High Level – Hill Road 1994 2 4 48y 1
Gis. High Level – Hauroa Road 1990 2 4 44y 1
Gis. High Level – Gaddums Hill 1991 2 4 45y 1
Gis. High Level – Pah Road 1969 2 4 23y 1
1Key:- 1 = Very Good
2 = Good
3 = Moderate
4 = Poor
5 = Very Poor
or Not Critical
Low Criticality
Moderate Criticality
High Criticality
Very High Criticality
GCWS Reticulation Pipework: Overview
For the purposes of this Activity Management Plan trunk mains are considered the main feeder lines
from water treatment plants to the reticulation mains. For the purposes of this asset management
plan distribution mains are considered the main feeder lines from water treatment plants to the
reticulation mains within the Gisborne City.
Gisborne City Water Distribution Model
In October 2006, Utilities commissioned OPUS Consultants to construct a detailed hydraulic model
of the city of Gisborne. The scope of work included the following:
Hydraulic Model – Construction and Verification
Scenario Testing
Study Documentation and Model Handover
Activity Management Plan Gisborne District Council
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This model now supersedes the Beca Stevens report (Overview of Gisborne Water Network Analysis)
and has been predominantly used to ascertain the effect that large additions to the water network
will have when the scenarios are run in the model programme. The Growth Scenarios already studied
are the Western Industrial Ring Main and Wainui and Okitu Growth.
Within the model lies the basis for the future improvements and also an understanding of the
present condition, capacity and performance of the water network.
Waingake Distribution Main
The Waingake line is a 525mm (21 inch) concrete lined steel pipe with gibault joints, approximately
every 7 m, is cathodically protected and extends from the Waingake Water Treatment Plant to the
intersection of Gladstone Road and Lytton Road with various connections along the line.
Most pipe bridges meet the required performance criteria and are of good condition. One exception
and an area of concern is the Te Arai River swing bridge. This has been identified as a possible point
of failure during a flood event which did occur in late 2005 and is in the Gisborne City Water Supply
PHRMP. This involves the implementation of the maintenance programme recommended in the Te
Arai River swing bridge structural report. Further details are in Section 6: Options and Choices.
The self-supporting span at Emerald Hills requires technical reviewing as apparent sagging is evident
in the pipeline, but it is of no immediate danger of failure.
Additional diversion of the Waingake water occurs at Granny Tarr Street opposite the Gisborne
Showgrounds, and feeds through a 450 asbestos cement pipe across the Taruheru River to
Cameron Road to Back Ormond Road via Hansen Road. The main continues through the full length
of Ormond Road, down to Wi Pere Street with dispirit take offs and a main feeder running to the
hospital hill reservoir, but for the purposes of this part of asset we will treat the asbestos cement
main separately from the reticulation.
Waipaoa Distribution Main
A 400 mm concrete lined steel pipe fully welded, which extends from the Waipaoa Augmentation
Plant and joins into the Waingake supply line downstream at the Makaraka Booster Pump Station,
approximate distance being 6 km. Additional security of welding the pipe to form a continuous line
was taken to overcome risks associated with earthquake and provide continuity for Cathodic
Protection.
Reticulation Components
The physical parameters of the Gisborne City reticulation are provided for in the following tables,
which show the age profile, material type and pipe diameter for the water mains. The age profile
mirrors all ancillary equipment associated with those mains, such as fire hydrants and valving, and
for the purposes of this Activity Management Plan, these have been included as part of the mains
profile for valuation purposes. The table identifies that there are three main pipe material types
being cast iron, asbestos cement and concrete lined steel.
For the purpose of this Activity Management Plan, valves, hydrants and air valves have been
included in the valuation costs for the pipe line, as they have identical ages as the pipe line and any
repairs undertaken for these components are only to maintain their level of service and are unlikely
to be reused should that line be replaced at a later stage. This will be reviewed as part of the
improvement programme.
Schedule of Pipework
Pipe Asset (mm) Length (metres)
Pipe Size
20 180
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Pipe Asset (mm) Length (metres)
25 466
32 14
38 70
40 99
50 14,314
63 633
75 1,061
90 490
100 92,610
125 285
150 45,501
180 247
200 9,072
225 4,082
250 1,656
300 13,921
375 308
400 6,011
450 13,408
525 36,153
Total Length (m) 240,581
Pipe Fittings
Hydrants 1,508
Valves 1,652
Reticulation Material Type
Reticulation Material Type
05
10152025303540
AC Cast Iron Expoxy
Lined
MDPE PVC ST-CL OTHER
Materials
% P
ipe L
en
gth
Reticulation Age
Material type of the reticulation system is largely dependant on installation date. Early pipes were made of cast iron, in the 50’s to 80’s AC mainly used. Since the 1980’s plastic have dominated material types being installed.
Activity Management Plan Gisborne District Council
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Reticulation Age
0
5
10
15
20
25
0-5
6-1
0
11-1
5
16-2
0
21-2
5
26-3
0
31-3
5
36-4
0
41-4
5
46-5
5
56-6
0
61-6
5
66-7
0
71-7
5
76-8
0
80+
Unknow
n
Age (Years)
% P
ipe L
en
gth
Reticulation Condition
0
10
20
30
40
50
60
70
80
1 Very Good 2 Good 3 Moderate 4 Poor 5 Very Poor
Condition Grading
% P
ipe L
ength
Reticulation Performance
0
10
20
30
40
50
60
70
80
1 Very Good 2 Good 3 Moderate 4 Poor 5 Very Poor
% P
ipe L
ength
The pipe ages are reflective of the city development and expansion.
Recent cast iron rehabilitation, lead pipe replacement programme and the relevantly recent installation dates means all assets are moderate or better
The good performance is a reflection on the
condition and age of the reticulation.
Activity Management Plan Gisborne District Council
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* Definition of Performance and Criticality Gradings:-
Grade Condition Performance Criticality
1 Very Good Always meets target service
standards.
No significant adverse short-term impact.
2 Good Almost always meets target service
standards.
Failure will cause localised and serious
disruption to service delivery.
3 Moderate Generally meets target service
standards.
Failure will cause localised and serious
disruption to service delivery, possible
health and safety effects and / or loss of
critical data.
4 Poor Does not generally meet target
service standards.
Failure will cause serious disruption to
service delivery over a substantial area,
possible health and public safety effects.
5 Very Poor Never meets target service
standards.
Widespread and serious disruption to
service delivery, possible health and public
safety effects.
GCWS Fire Fighting Capacity
Gisborne District Council aims to meet SNZ PAS 4509:2008 New Zealand Fire Service Fire Fighting
Water Supplies Code of Practice for all Urban Fire Districts.
The most influential factor in assessing the future demands is the existing requirements under the
New Zealand Fire Service Code of Practice for fire hydrant flows and storage capacity as opposed to
domestic demand. Some upgrading of watermains has been completed and should resolve the some
known capacity issues. The design standard that will be applied to the capacity upgrading work is the
SNZ PAS 4509:2008 New Zealand Fire Service Fire Fighting Water Supplies Code of Practice.
The Fire Fighting Code of Practice is prepared and issued by the NZ Fire Service pursuant to The Fire
Service Act 1975. It defines various water supply classifications from W1 – W8 (ranging from single
family dwellings to hotels/businesses to supermarkets/industrial areas) by the fire hazards present
and then states minimum water flows, storage volumes and pressures required. The water supply
classification can change within a town between the residential properties (W3), industrial areas
(W7/8) and depending on the floor area (fire cell) of commercial/public properties. Therefore, the
demands on the water supply differ between these areas.
Gisborne City Water Supply is the only gazetted Urban Fire District within Gisborne District. The Fire
Fighting Code of Practice is a guideline document but can be incorporated into bylaws under section
146(b) of the Local Government Act 2002 or district plans prepared under the Resource
Management Act 1991. Section 92(2) of the Fire Service Act 1975 also enables regulations to be
made specifying requirements for fire hydrants, however, this will only be resorted to if the guidelines
prove to be ineffective in achieving compliance. It is important to note that the Building Code also
requires that fire safety clauses be met.
It is noted that the flows required for fire fighting are generally well in excess of the flows required for
domestic or industrial consumption. Therefore, if the fire fighting flow requirements are met this
Activity Management Plan Gisborne District Council
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could be considered to meet the quantity requirements for providing a water supply under the
various Government Acts and Regulations.
Name Dist. Capacity Category Type Supply
Gisborne Piped Fire fighting Domestic and Industry Urban Demand
Te Karaka Piped Consumer Domestic Residential Restricted and Storage
Whatatutu Piped Consumer Domestic Residential Restricted and Storage
Te Puia Piped Consumer Domestic Residential Restricted and Storage
In October 2006, Utilities commissioned OPUS Consultants to construct a detailed hydraulic model
of the city of Gisborne. The scope of work included the following:
Hydraulic Model – Construction and Verification
Scenario Testing
Study Documentation and Model Handover
This model now supersedes the BECA Stevens report (Overview of Gisborne Water Network Analysis)
and has been predominantly used to ascertain the effect that large additions to the water network
will have when the scenarios are run in the model programme. The Growth Scenarios already studied
are the Western Industrial Ring Main and Wainui and Okitu Growth.
Within the model lies the basis for the future improvements and also an understanding of the
present condition, capacity and performance of the water network, but in order to finalize all
recommendations on this subject, the calibration of the water model must be completed first. This is
programmed for 2009/10. It is important to note that until the verification of the Hydraulic model is
completed, all recommendations and monies will come from the BECA report.
Both the required flow rates and storage volumes are considered when examining compliance with
the Fire Fighting Code of Practice.
Currently Gisborne City Water Supply meets the Fire Fighting Code of Practice in all but the high level
areas and some outlying areas where hydraulic grades must be overcome. Upper storage capacity
has been increased to meet the Code of Practice.
It is possible that the requirements for fire fighting may reduce over time as changes in fire fighting
technology occur, for example, development of foam and non-water products for extinguishing fires.
This may alter the Fire Fighting Code of Practice and hence the design requirements. These changes
will be monitored and the appropriate actions taken as they occur.
Areas identified as not meeting the Fire Fighting Code of Practice will be included in capital upgrade
programmes as appropriate. Existing work programmed include:
Fire flow capacity upgrade in 2011/12-2012/13.
A ring main to the Western Industrial area to boost capacity and fire fighting ability in
2008/09-2009/10.
Further detail on these proposed projects are in Section 6: Options and Choices.
There are 1508 fire hydrants in the Gisborne City fire area. The fire services in their monthly checks
identify the hydrants that need maintenance and fail to meet their minimum standard.
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Te Karaka Water Supply (TKWS)
TKWS Overview
Te Karaka Water Treatment Station
Te Karaka Water Treatment Station is located on the township side of the Waipaoa river stop bank
and provides a water supply that is supplementary to the rainwater collected by each individual
consumer during extended dry periods. Treatment involves oxidation and filtering of raw water, then
chlorine is added to help with disinfection.
This system was setup through funding from a Health Department subsidy and was installed in
December 1982. Since then, issues regarding low water quality from the bore, insufficient treatment
facilities and non-compliance from the connected properties.
This pump station is well maintained but is beginning to age with an increasing number of faults
expected as the economic life nears ending.
Supply Pump Stations
The pump was replaced in 2005 as the impellors of the old one separated from the spindle and the
condition grading reflects this. The pump has a high number of starts per hour as it operates in a
pressure pump capacity more than a strictly supply pump. This is the only pump in the system and is
used to force water through the treatment process and to the consumer.
This pump station is well maintained but is beginning to age with an increasing number of faults
expected as the economic life nears ending.
Schedule of Pump Stations
Pump Station
Ye
ar
Bu
ilt
Ye
ar
Up
gra
de
d
De
scri
pti
on
Co
nd
itio
n1
Pe
rfo
rma
nce
1
Cri
tica
lity
1
Re
ma
inin
g L
ife
Nu
mb
er
of
Pu
mp
s
Groundwater 1983 Nil Bore pump 1 3/4 5 9y 1
1Key:- 1 = Very Good
2 = Good
3 = Moderate
4 = Poor
5 = Very Poor
or Not Critical
Low Criticality
Moderate Criticality
High Criticality
Very High Criticality
Water Quality
Untreated Water Quality
Water quality from the bore is poor. The water has a high iron and manganese content. The supply is
provided from a bore on the outer stop bank of the Waipaoa River and is pumped from the bore into
a pressure tank, and fed directly to the town.
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Treated Water Quality
The water quality has been assessed as part of the Health Department grading as an Ee. Major
concerns with supplying a higher water quality exists, due to the supplementary nature of the supply
being discharged directly into rain water tanks, which has a lower water quality than that being
provided to the consumer.
As part of the future water review standards for the NZ Drinking Water Standards it would be
proposed to address water quality used directly with the Health Department and the Chief Medical
Health Officer, as currently standards do not adequately cover this situation. This will be solved with
the success of the TAP & CAP application.
Schedule of Treatment Plants
Treatment
Plant Description
Year
Built
Ye
ar
of
Ma
jor
Up
gra
de
s
Structure Plant General
Re
pla
ce
me
nt
Va
lue
($0
00
)
Co
nd
itio
n1
Pe
rfo
rma
nce
1
Re
ma
inin
g L
ife
Co
nd
itio
n1
Pe
rfo
rma
nce
1
Re
ma
inin
g L
ife
Cri
tica
lity
1
Te Karaka
Cumry iron
removal
and
chlorinator
1982 Nil 2 2 9y 3 4 9y 2 $68.3
1Key:- 1 = Very Good
2 = Good
3 = Moderate
4 = Poor
5 = Very Poor
or Not Critical
Low Criticality
Moderate Criticality
High Criticality
Very High Criticality
The water produced by this plant is independently sampled by the Gisborne District Council
Environmental Health Office who acts on behalf of the MoH. Sampling programmes include
microbiological monitoring, and chemical parameter monitoring.
Catchment Security
The bore feeds from the fluvial deposits of the Waipaoa River. The groundwater is shallow and
unsecure.
Supply Pipe Line
Te Karaka is situated at a relative level above the bore pump station. A 100mm PVC line extends
from the bore pump shed to the reticulation system.
Reticulation
The reticulation is a supplementary supply and security is impossible to ensure to the consumers tap
as the water supply mixes with unknown water quality in the private tank systems. Water supply is
managed so that the water has residual chlorine of at least 0.3g/m³ when entering the tank.
Quality Control
Management Quality Assurance
The same management Quality Assurance techniques as Gisborne City will be applied.
Operational Quality Assurance
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To establish and ensure the ongoing improvement of the quality of this Plan a series of quality
assurance systems are planned as follows:
Treatment Plant operational manuals
Reticulation quality systems
Hazard quality systems
Connection controls
Backflow Prevention
Treatment Plant operations manuals
The Te Karaka system has had an operational manual for the groundwater pump station and
treatment system developed. Operation occurs within the confined of these procedures.
Reticulation quality systems
A public health risk management plan (PHRMP) is currently in the draft stages at the time of writing
this Activity Management Plan but is scheduled to be submitted to the Ministry of Health within the
next few months. This is used to apply for funding from Central Government set aside to offer Capital
and Technical assistance (TAP & CAP funding) for small water supplies. GDC‟s aim is to completely
overhaul the water supply system in Te Karaka but this is solely subject to the funding that is granted
by the Ministry of Health.
An extensive monitoring programme exists by various stakeholder groups. This monitoring includes;
Monitoring – Daily, for basic chemical parameters
Sampling – Monthly, microbiological
Sampling – 2 monthly, Iron, Manganese
Spot condition sampling, as required.
Hazard Quality systems
Site safety is a critical component to the operation of the treatment plant, with a large portion of
safety documents having been written. The Treatment facility has a chlorine solution on site for
treatment. The chlorine on site is below the amount required for the site to require a chlorine storage
certification.
On-site induction for visitors and contractors exists. Ongoing operator training is provided to maintain
competency levels. As part of the need to identify and fulfil requirements of Occupational Safety &
Health, it has been necessary to document to a higher level the processes and safety requirements.
Health and Safety is an ongoing evolving process and monthly meetings are held to specifically raise,
highlight, resolve and educate health and safety items amongst the operational.
Council‟s reticulation maintenance contractor Fulton Hogan has a strong health and safety policy
and these issues are handled within the maintenance contract.
Control over connections
Council has strict control over the existing and new connections. All connections require a toby
boundary tap to be installed. This allows council to isolate service lines that do not meet the Council
requirements and apply restrictions where necessary.
All domestic connections shall progressively be upgraded to a toby manifold.
New connections to existing infrastructure require approval by Council. Only Council‟s approved
maintenance contractor is allowed to tap the water main for new connections.
A Level 3 Water Reticulation Service Person qualification is the minimum standard qualification a
person working on the water main including the installation of new connections.
Backflow Prevention
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A double check valve backflow preventer is provided in all new toby manifolds. This unit houses both
the backflow prevention and flow restrictor. These were last inspected in 2006/07 by GDC staff
which gives further detail under „Performance‟ in the Te Karaka: Reticulation section of this
document.
TKWS Reservoirs, Dams and Other Storage Facilities
There are no storage facilities or reservoirs in this system other than those privately owned that this
service supplements. 1 tank exists for the sole use of the rural fire service.
The size of private storage varies but is generally 22 cubic metres (5,000 gallon)
The condition of the private tanks vary any leaks are noted during regular property inspections and
addressed as required.
TKWS Reticulation
Reticulation Components
For the purpose of this Activity Management Plan, valves, hydrants and air valves have been
included in the valuation costs for the pipe line, as they have identical ages as the pipe line and any
repairs undertaken for these components are only to maintain their level of service and are unlikely
to be reused should that line be replaced at a later stage. This will be reviewed as part of the
improvement programme.
Schedule of Pipework
Pipe Asset (mm) Length (metres)
Pipe Size
25 655
32 135
40 855
50 1545
75 490
100 400
Total Length (m) 4080
Pipe Fittings
Hydrants 0
Valves 12
TKWS Fire Fighting Capacity
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The reticulation is insufficient to provide fire fighting flows and no hydrants are provided in the
reticulation system. A number of bulk fire storage tanks exist underground in Currie, Cliff and Library
Roads.
Whatatutu Water Supply (WTWS)
WTWS Overview
The original design for the Whatatutu water supply was for 400 people, with the original population
at 320. The original forecast was for the population to increase as a consequence of forestry
development in the Mangatu Area, in actual fact the population has diminished to approximately
280 people, and further growth in this area is unlikely over the next planning horizon. The original
design was to cater for 1000 litres of water per property per day, which is the equivalent to 250 litres
of water per person per day per household, assuming occupancy of four people.
The original scheme was undertaken in conjunction with a Health Department subsidy, which was
available at that time. Installation took place in 1979 and was provided on a supplementary supply
basis to top up existing users rainwater tanks during extended dry periods.
The original supply is provided from a bore adjacent to the Mangatu River and is pumped from the
bore into a pressure tank, pumped up the hill to a sand filter and fed directly to the town. This has
subsequently been replaced with a Cumary filter, which introduces oxygen into the water supply to
assist in iron, and manganese removal, which is taken out as part of the filtration process. This is
then chlorinated and pumped through pressure tanks to the consumer.
No loss of service potential exists for these assets and maintenance levels are carried out on a
proactive and reactive basis. A contract exists for the maintenance of this reticulation system with
Fulton Hogan, Council‟s maintenance Contractor, with a pseudo township caretaker residing at Te
Karaka and employed by Fulton Hogan. His duties consist of daily water quality testing at the Te
Karaka and Whatatutu bores recording those results and forwarding them through to Engineering
and Works for further processing. Complaints are currently fielded at the Te Karaka Service Centre,
with all complaints being logged and submitted to Engineering and Works on a weekly basis. Due to
the static population no increase in the reticulation is anticipated and only the ongoing renewal of
the system is being planned for.
As previously stated, renewals will be based on current levels of service but further public
consultation will proceed as part of any renewal plan, closer to the time of replacement. No deferred
renewals exist.
The original forecast was for the population to increase as a consequence of forestry development in
the Mangatu Area, in actual fact the population has diminished, and further growth in this area is
unlikely over the next planning horizon. The original design was to cater for 1000 litres of water per
property per day, which is the equivalent to 250 litres of water per person per day per household,
assuming occupancy of four people.
The original scheme was developed in conjunction with the installation of sewer reticulated system.
It was constructed with Health Department subsidy which was available at that time. Installation took
place in December 1982 and was provided on a supplementary basis to top up existing users
rainwater tanks during extended dry periods.
Supply Pump Stations
The pump was replaced in 2005 as the impellors of the old one separated from the spindle and the
condition grading reflects this. The pump has a high number of starts per hour as it operates in a
Activity Management Plan Gisborne District Council
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pressure pump capacity more than a strictly supply pump. This is the only pump in the system and is
used to force water through the treatment process and to the consumer.
This pump station is well maintained but is beginning to age with an increasing number of faults
expected as the economic life nears ending.
Schedule of Pump Stations
Pump Station
Ye
ar
Bu
ilt
Ye
ar
Up
gra
de
d
De
scri
pti
on
Co
nd
itio
n1
Pe
rfo
rma
nce
1
Cri
tica
lity
1
Re
ma
inin
g L
ife
Nu
mb
er
of
Pu
mp
s
kW
of
ea
ch
Pu
mp
Groundwater 1979 Nil Bore pump 1 3/4 5 7y 1 4
1Key:- 1 = Very Good
2 = Good
3 = Moderate
4 = Poor
5 = Very Poor
or Not Critical
Low Criticality
Moderate Criticality
High Criticality
Very High Criticality
B = Building
C = Cabinet Only
SB = Switchboard
Water Quality
Untreated Water Quality
Water quality from the bore is poor. The water has a high iron and manganese content. The supply is
provided from a bore adjacent to the Mangatu River and is pumped from the bore into a pressure
tank, and fed through to the pump station located at the end of Peneha St.
Treated Water Quality
The water quality has been assessed as part of the Health Department grading as an Ee. Major
concerns with supplying a higher water quality exists, due to the supplementary nature of the supply
being discharged directly into rain water tanks, which has a lower water quality than that being
provided to the consumer.
As part of the future water review standards for the NZ Drinking Water Standards it would be
proposed to address water quality used directly with the Health Department and the Chief Medical
Health Officer, as currently standards do not adequately cover this situation. This will be solved with
the success of the TAP & CAP application.
Schedule of Treatment Plants
Treatment
Plant Description
Year
Built
Ye
ar
of
Ma
jor
Up
gra
de
s
Structure Plant General
Re
pla
ce
me
nt
Va
lue
($0
00
)
Co
nd
itio
n1
Pe
rfo
rma
nce
1
Re
ma
inin
g L
ife
Co
nd
itio
n1
Pe
rfo
rma
nce
1
Re
ma
inin
g L
ife
Cri
tica
lity
1
Whatatutu Cumry iron
removal
and
chlorinator
1979 Nil 2 2 7y 3 4 7y 2 $68.2
1Key:- 1 = Very Good
2 = Good
or Not Critical
Low Criticality
B = Building
C = Cabinet Only
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3 = Moderate
4 = Poor
5 = Very Poor
Moderate Criticality
High Criticality
Very High Criticality
SB = Switchboard
The water produced by this plant is independently sampled by the Gisborne District Council
Environmental Health Office who acts on behalf of the MoH. Sampling programmes include
microbiological monitoring, and chemical parameter monitoring.
Catchment Security
The bore feed from the fluvial deposits of the Mangatu River. The groundwater is shallow and
unsecure.
Supply Pipe Line
Whatatutu is situated at a relative level above the bore pump station. A 50mm PVC line is supported
up the hill side with waratah stakes and has been covered with 100mm of soil to protect it from
stock damage and UV light.
Reticulation
The reticulation is a supplementary supply and security is impossible to ensure to the consumers tap
as the water supply mixes with unknown water quality in the private tank systems. Water supply is
managed so that the water has residual chlorine of at least 0.3g/m³ when entering the tank.
Quality Control
Management Quality Assurance
The same management Quality Assurance techniques as Gisborne City will be applied.
Operational Quality Assurance
To establish and ensure the ongoing improvement of the quality of this Plan a series of quality
assurance systems are planned as follows:
Treatment Plant operational manuals
Reticulation quality systems
Hazard quality systems
Connection controls
Backflow Prevention
Treatment Plant operations manuals
The Whatatutu system has had an operational manual for the groundwater pump station and
treatment system developed. Operation occurs within the confined of these procedures.
Reticulation quality systems
A public health risk management plan (PHRMP) is currently in the draft stages at the time of writing
this Activity Management Plan but is scheduled to be submitted to the Ministry of Health within the
next few months. This is used to apply for funding from Central Government set aside to offer Capital
and Technical assistance (TAP & CAP funding) for small water supplies. GDC‟s aim is to completely
overhaul the water supply system in Whatatutu but this is solely subject to the funding that is
granted by the Ministry of Health.
An extensive monitoring programme exists by various stakeholder groups. This monitoring includes;
Activity Management Plan Gisborne District Council
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Monitoring – Daily, for basic chemical parameters
Sampling – Monthly, microbiological
Sampling – 2 monthly, Iron, Manganese
Spot condition sampling, as required.
Hazard Quality systems
Site safety is a critical component to the operation of the treatment plant, with a large portion of
safety documents having been written. The Treatment facility has a chlorine solution on site for
treatment. The chlorine on site is below the amount required for the site to require a chlorine storage
certification.
On-site induction for visitors and contractors exists. Ongoing operator training is provided to maintain
competency levels. As part of the need to identify and fulfil requirements of Occupational Safety &
Health, it has been necessary to document to a higher level the processes and safety requirements.
Health and Safety is an ongoing evolving process and monthly meetings are held to specifically raise,
highlight, resolve and educate health and safety items amongst the operational.
Council‟s reticulation maintenance contractor Fulton Hogan has a strong health and safety policy
and these issues are handled within the maintenance contract.
Control over connections
Council has strict control over the existing and new connections. All connections require a toby
boundary tap to be installed. This allows council to isolate service lines that do not meet the Council
requirements and apply restrictions where necessary.
All domestic connections shall progressively be upgraded to a toby manifold.
New connections to existing infrastructure require approval by Council. Only Council‟s approved
maintenance contractor is allowed to tap the water main for new connections.
A Level 3 Water Reticulation Service Person qualification is the minimum standard qualification a
person working on the water main including the installation of new connections.
Backflow Prevention
A double check valve backflow preventer is provided in all new toby manifolds. This unit houses both
the backflow prevention and flow restrictor. These were last inspected in 2006/07 by GDC staff
which gives further detail under „Performance‟ in the Te Karaka: Reticulation section of this
document.
WTWS Reservoirs, Dams and Other Storage Facilities
There are no storage facilities or reservoirs in this system other than those privately owned that this
service supplements. 1 tank exists for the sole use of the rural fire service at 6 Ngawari Place.
The size of private storage varies but is generally 22 cubic metres (5,000 gallon)
The condition of the private tanks vary any leaks are noted during regular property inspections and
addressed as required.
WTWS Reticulation
Reticulation Components
For the purpose of this Activity Management Plan, valves, hydrants and air valves have been
included in the valuation costs for the pipe line, as they have identical ages as the pipe line and any
repairs undertaken for these components are only to maintain their level of service and are unlikely
Activity Management Plan Gisborne District Council
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to be reused should that line be replaced at a later stage. This will be reviewed as part of the
improvement programme.
Schedule of Pipework
Pipe Asset (mm) Length (metres)
Pipe Size
25 1710
38 340
50 635
Total Length (m) 2685
Pipe Fittings
Hydrants 0
Valves 10
WTWS Fire Fighting Capacity
The reticulation has insufficient to provide fire fighting flows and no hydrants are provided in the
reticulation system. One bulk fire storage tank exists underground at 6 Ngawari Place.
4.4 Current Costs and Funding Policy
Council has completed a rigorous examination of funding policy for all activities under its control. The
following funding mechanisms are promoted.
Funding Sources and Mechanisms;
100% Targeted Rates, to people connected to the reticulation system. (To those
who have availability but are not connected, charge 50 %.)
Commercial users and bulk users have a combination of Targeted Rate and
water charges.
Loans
Councils funding strategy is outlined in the Annual Plan and Long Term Financial Strategy.
Council‟s funding strategy for the water supply assets are:
Operations maintenance expenditure from specific uniform annual charge.
Rates are levied on a uniform charge for each property receiving the service.
Loss of service potential identified as catch-up is funded from specific uniform
annual charge in the same manner as the operations maintenance expenditure.
Capital expenditure is funded from either loan or renewal fund.
Depreciation is calculated in accordance with the requirements of Financial
Reporting Standards from the fixed asset register.
Fees and Charges Schedule of Fees and Charges
The following Fees and Charges apply to the Water Supply Activity:
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The Domestic Water Connection Fee for the first connection to an un-serviced property
for Water is $330 (inclusive of GST).
Metered water to commercial and industrial properties is charged at a rate set annually
by Council.
All other charges are covered by the rate strike. Rates for water are charged per
connected property. Properties able to be connected, but who choose not to be
connected are rated a half charge.
Standard plumbing and drainage charges for Building Consents apply.
Table L1
Fees and Charges for Water Supply
Fee or Charges Current Charge
(GST Exclusive) Comments
Connection Fee
(subsidised)
$300 + rate adjustment Individual lot first domestic connection.
Connection Fee Actual cost + 10% + rate
adjustment
Second domestic connection per lot or
commercial
Metre reading $0.805 per cubic metre Reading intervals based on quantity of
usage.
Policy and Procedural Implications
No policy or procedural matters are unresolved. As the funding method is reviewed this may require
some adjustment of Council policy. These adjustments will be included in later activity management
plans.
4.5 Key partners/stakeholders
To assist in the water, wastewater and stormwater activities the Gisborne District Council
has the following partnerships and/or special relationships to plan and deliver the activity.
Opus International Consultants – Professional Services Contract
To provide and assist the Gisborne District Council with professional services for design,
supervision, procurement and delivery for the activities of the wastewater, water supply and
storm water activities.
The Opus Team are to become an integral partner in the running of the three activities. This
will be formally through the professional services contract. The contract is more of a
„partnership‟ than any standard services contract and is currently part way through a review
at the time of writing this plan. That is expressions of interest have been received, assessed
and an initial discussion has occurred with Opus. The next step is to provide a memorandum
of understanding or similar and undertake working workshops to progress the partnership.
Opus would provide relevant expertise and technical experience within their local office and
provide a „window” into their experience and technical expertise nationally.
They also provide a best for project methodology and along with project and asset
management skills.
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Fulton Hogan Limited – Maintenance Contract
Fulton Hogan provides the services and maintenance of the stormwater, wastewater and
water supply assets for the Gisborne District.
Fulton Hogan is engaged to maintain the existing infrastructure at the designed capacities to
provide the agreed levels of service. They protect the community from the effects of failed
infrastructure and minimise or eliminate any health, safety and environmental concerns.
Fulton Hogan have a large local presence and cover the three activities on a 24/7 coverage.
Currently Fulton Hogan primarily maintains the reticulation and distribution of the water
network with GDC operators running the treatment plants and storage dams. Fulton Hogan
also maintains the collection, distribution and disposal of wastewater and stormwater
services. It is undecided at the time of writing this AMP if the new WWTP will be run by the
maintenance contractor. If it is not it would be run by a GDC operations team as currently is
the case with the water treatment plants.
Hydro-Technologies Ltd – Equipment Maintenance and Environmental Monitoring; Data
Management
Hydro-Technologies monitor resource consent compliance for all of Utilities resource
consents. They also undertake quality control monitoring which includes sampling and/or
analysis on ground water, surface water, soil samples, leachate, potable water, general
sewage and trade wastes. Reports are produced immediate for non compliances where
required and summary reports are produced as regular as on a monthly basis.
Areas for monitoring include but are not limited to – septage disposal sites, marine outfall
consent monitoring, bore consent monitoring, oxidation pond (Te Karaka) consent
monitoring, water supplies and compliance monitoring, tradewaste monitoring, and
calibration of rain gauges.
Environmental Health GDC – Water supplies action and reporting protocol
The Environmental Health section of the Gisborne District Council have a protocol document
which is primarily to assist the Utilities department in the operation and monitoring
requirements for the NZDWS within the water supply activity. The document sets out what to
do for any non compliances, exceedances and transgressions and what actions are to be
undertaken in particular situations. The population of the WINS database is undertaken by
the Environmental Health.
The following stakeholders do not hold any formal contract with the Gisborne District Council
but have in the past provided and assisted in the execution of the water and wastewater
activities. They continue to do this today.
Transfield (Napier) – Telemetry
Transfield provide Abbey System software and Scada support for wastewater and water
telemetry systems. It is intended that Transfield continue to be employed as required.
Operational Plans and Manuals – Mike Davidson
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Mike Davidison provides operational plans and manuals primarily for the operation of the
collection, treatment and reticulation of the water supply activity. Mike Davidson also has
produced various contingency plans, wastewater operational plans and manuals. It is
intended that Mike Davidson continue to be employed regularly as required.
4.6 Assumptions
Below are the significant assumptions made in preparing this Activity Management Plan:
The information provided has been developed from a sound base, the asset register being of
high quality and renewal projections risk based on pipe failure.
The accuracy of the valuations and the need to reassess valuations once the capital
upgrading programme is completed could affect the financial projections.
The renewal programme is based on a small condition sample. These inspections have
indicated that the assets are in good condition.
The financial information presented in this Activity Management Plan would also be affected
if Council chose to service towns not currently serviced, or to develop services to
accommodate a large industry in an area either currently unserved or with under-capacity
services.
The Water Engineer‟s best judgement has been used in preparing capital cost projections
with anticipated results from the preparation of the Public Health Risk Management Plans
and the outcome of the Water and Sanitary Assessments. Any significant change in the
desired Level of Service identified through these processes could impact on this Activity
Management Plan and these changes will be incorporated into the next review of this Plan.
In preparing this Activity Management Plan, it is assumed that the District Plan (which is
currently partly operative) will become operative without substantial modification to matters
that would affect the Stormwater network system.
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4.7 Risk Management
The water, wastewater and stormwater activities have had a significant number risk assessment and
management documents undertaken in the past. The following is a list of these documents from
2006 onwards –
Report Name Author Date Company
GDC Risk Management - Stormwater Reticulation Tim Crook 19-May-
98
Gisborne District Council:
Legal Team
GDC Risk Management - Sewerage Reticulation Tim Crook 16-Jul-
98
Gisborne District Council: Legal
Team
GDC Risk Management - Sewerage Treatment &
Disposal Tim Crook
16-Dec-
98
Gisborne District Council: Legal
Team
GDC Human Health Risk Assessment for the
Wastewater Outfall EGIS Consulting Sep-99 EGIS Consulting Australia
GDC Risk Management - Water Supply Pipeline Gordon Brock 19-May-
98
Gisborne District Council: Legal
Team
GDC Risk Management - Dams & Storage Reservoirs Kristen
Mcpherson
28-Sep-
98
Gisborne District Council: Legal
Team
Public Health Risk Management Plan – Gisborne Water
Supply Helen Churton Feb-08 OPUS Consulting
Public Health Risk Management Plan – Te Karaka
Water Supply Marlis Haertel Feb-08 GDC
Public Health Risk Management Plan – Whatatutu
Water Supply Marlis Haertel Feb-08 GDC
Volcano-Hydrologic Hazards in the Waipaoa Catchment V Manville Jul-04 Institute of Geological & Nuclear
Sciences Ltd
GDC Emergency Management Response Plan for Bulk
Water Pipeline Failure Mike Davidson
1-May-
08
Quality System Consulting
Services
GDC Risk Management – Plant & Motor Vehicles Tim Crook 7-Apr-99 Gisborne District Council: Legal
Team
GDC Risk Management – Staff & Industrial Relations Kay Ligget 16-Mar-
99
Gisborne District Council: Legal
Team
Gisborne District Civil Defence & Emergency Services
Volcanic Contingency Plan Unknown Dec-06 GDC
GDC Emergency Management Plan – Water & Waste Mike Davidson Feb-08 Quality System Consulting
Services
The documents below have been listed as they were produced as part of the risk portfolio. However
these documents provide information on types of risks rather than being a formal risk assessment
and management document.
Risk Information
Documents
Name Author Date Subject
Kaharoa Eruption
Hazards Workshop Environment B.O.P.
12
October
2003
A Regional Volcanic Contingency plan
for a Kaharoa eruption.
National Civil Defence
Emergency
Management Strategy
Ministry of Civil
Defence
August
2003 Proposal for discussion
Guidelines for Action American Public August Public works role in emergency
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Works Association 1998 management
Lifeline Utilities &
Emergency
Management
Ministry of Civil
Defence
December
2002 Directors guidelines for lifeline utilities
Lifeline Utilities &
Emergency
Management
Ministry of Civil
Defence
December
2002 Information for lifelines utilities
Lifelines Co-operation
Study for Water Supply Carson Group NZ
October
1998
Investigate developing a voluntary
agreement between Water authorities
(nationally) for supplying assistance to
another authority who suffers major
infrastructure damage from a natural
disaster
Civil Defence Report
97/5
Institute of
Geological &
Nuclear Sciences
report
May 1997
The impact of recent falls of volcanic
ash on public utilities in two
communities in the United States of
America
Risk & Realities Canterbury
University 1997
A multi-disciplinary approach to the
vulnerability of lifelines to natural
hazards.
A summary document broken down into each activity and then detailing corresponding reports has
been attached as Appendix D. Also included in the attachment is a list of „counter measures‟ and
„improvement plans‟ compiled from each of the individual reports.
Every „counter measure‟ and „improvement‟ from the documents above has been considered when
creating the improvement plan section of this Activity Management Plan.
Water
There are a significant number of water risk assessment and management documents that have
been completed within the past year. These documents are substantial documents and have had
significant input from existing GDC staff and technical experts. It is not intended to undertake any
new risk assessment documents for the water activity in the near future as the improvement plan
component of the existing documents will take significant time and resources to work through. The
plan will reviewed as required by the Ministry of Health.
Private Water Supply Systems
Council has identified, as part of the Three Waters Assessments Consultation, that there are
accepted health risks associated with the provision of Water, Wastewater and Stormwater and that
the rural communities do not wish the Council to increase Levels of Service to reduce these risks.
Due to the costs associated with the development works owned and managed by Council the
community does not favour implementation of council capital works that would reduce the health
risk.
4.8 Negative effects
The potential significant negative effects of the water supply activity are:
Environmental - the effects on the environment of discharges of chlorinated water from
maintenance activities or pipeline failures.
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Social - Health and safety risks associated with the construction, maintenance or operation
of the water supply infrastructure. Property damage resulting from mains failures. Damage to
some household hot water valves caused by corrosion by-products within galvanised iron
rider mains and service connections.
Cultural - no potential significant negative cultural effects have been identified for the water
supply activity.
Economic - the economic cost to the community as a result of property damage resulting
from mains failures and corrosion by-products within the water supply.
Council mitigates these potential negative effects by a mix of asset management planning activities
including:
Asset development work.
Monitoring and testing.
Demand management initiatives.
Public education, including water conservation programmes.
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5. Where we want to be
5.1 Growth
Population in the serviced area is projected to remain fairly constant over the lifetime of the
Community Plan. Notwithstanding, up to around 1000 additional residential units are projected in
association a declining average household size. „Greenfield‟ residential development is projected to
continue to occur in areas around the city, such as the Taruheru Block. Some intensification is also
projected in existing residential areas. Heavy Manufacturing, Other industry Servicing,
Accommodation and Bars, Restaurants and Cafés and Residential Services (aged care facilities) are
to experience growth over the period, while Education and Health and Community Services are
projected to decline.
The growth projections used in this discussion are from the Gisborne District Council Growth Model
2008 and are for the period 2006-2021, which is just beyond the ten-year period of the Long Term
Council and Community Plan.
Residential
The growth model suggests that residential growth will be confined primarily to the Gisborne Urban
Area (GUA). In the rest of the District the number of households is projected to increase only slightly.
The growth model 2008 also suggests locations throughout the Gisborne Urban Area where the
residential growth will be more significant than in other areas. The more substantial residential
growth areas are –
Location
Estimated
household
numbers
2006
Projected
household
numbers
in 2021
Increase
in
household
numbers
from
2006 to
2021
Predominately Greenfields
1 Riverdale A (Taruheru Block) 265 403 138
2 Makaraka A (Taruheru Block) 27 155 128
3 Wainui 589 709 120
4 Matokitoki B (Glenelg Corner) 93 188 95
5 Makaraka C 157 228 71
Predominately Infill
6 Gisborne Central 1328 1511 183
7 Mangapapa 1600 1769 169
8 Whataupoko 1479 1629 150
9 Te Hapara 1716 1800 84
10 Kaiti South 965 1035 70
Comments on the above residential growth areas are –
1 & 2) Riverdale A and Makaraka A
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These two areas make up the Taruheru Block. This area is the most significant area of
“Greenfield” growth in the Gisborne Urban Area. The main town bulk supply pipes run along
the outside boundary of this area. This means that the impact on the water infrastructure is
primarily limited to the area serviced. The larger transfer mains required to maintain
appropriate service to the new area have been identified and sized through hydraulic
modelling and incorporated in to the Taruheru Structure Plan.
3) Matokitoki B (Glenelg Corner)
A feasibility study was undertaken for extending wastewater reticulation from the city as far
as the adjacent rural residential area between Matokitoki B and the city. However the
Council decided that onsite wastewater systems would continue to be used for any
development in this area. Logically the area will therefore also remain serviced primarily by
on-site water collection systems. This is because provision of a reticulated water supply (even
restricted) to this area would have a detrimental effect on on-site wastewater systems given
the high water table and some poorly drained soils. Therefore extension of water reticulation
as far as Matokitoki B is not anticipated.
4) Makaraka C
There is one large proposed subdivision in this area currently known as Citrus Grove. A
diameter 300mm main to provide water to the western industrial area is proposed to go
through this land. Alignment is subject to confirmation. Water could potentially be supplied
from this. However on-site water supply would probably be required for any lifestyle block
developments. Existing infrastructure should be capable of accommodating development
elsewhere in Makaraka C.
5) Wainui
The reticulation of the Wainui, Okitu, Sponge Bay area with water and wastewater was
pursued this year through the special consultative process in the LGA. After four days of
submissions being heard a resolution was agreed to not proceed with reticulation. This
means that the all but the 95 Lot subdivision in Sponge Bay, which is part way through
construction, is to be serviced by onsite wastewater systems and predominately roof water.
The Sponge Bay subdivision is to pay a financial contribution covering any upgrade works
required in the existing wastewater and water systems.
The upgrade of portions of the bulk mains from Ormond Road to the Knob Hill reservoir, new
pipes in the vicinity of the existing reservoir and a new pump station is proposed to enable
full mains supply development. It is proposed to undertake this work before all buildings on
this and the proposed development on the „Kaiti Blobs‟ land in Kaiti South are completed.
6, 7, 8 &9) Gisborne Central, Mangapapa, Whataupoko and Te Hapara
These areas are well facilitated with larger water mains running through these areas. Given
the relatively small increase in demand due to residential growth, and the likely spread of
development, it is expected that existing infrastructure should be able to cater for the
proposed growth. Local area upgrades only may be required. The hydraulic Model will be
updated regularly to check on this as new subdivisions occur.
9) Kaiti South
This area will have improved service due to the upgrade works proposed for Sponge Bay and
Kaiti South developments. This coupled with the relatively small increase in demand due to
the population growth and the likely spread of development means that only local upgrades
may be required. The hydraulic Model will be updated regularly to check on this as new
subdivisions occur.
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All local area upgrades will be identified on a case by case basis and sub-divisional support funds
from DC‟s would be utilised for this work.
Non Residential
The growth model projects a growth of 41,000m2 in the Gross Flood Area (GFA) of non-
residential activities. Using standard equivalence factors based on estimated typical daily
demands, this equates to about 180 „household unit equivalents‟ (HUE) of growth. The
most significant growth areas are –
Location
Estimated
GFA 2006
(m2)
Projected
GFA 2021
(m2)
Increase
in GFA
between
2006 and
2021
(m2)
Approx.
Increase in
HUE
Predominately Greenfields
1 Tiniroto A and Makaraka D (Western
Industrial Area)
40,686 56,647 15,961 36
Heavy Manufacturing 38,292 45,354 7,062 16
Warehousing 101 478 377 1
Other Industry/Servicing 2,293 10,814 8,521 20
Predominately Infill
2 Gisborne Central 385,798 394,992 9,194 42
Commercial (Other) 96,254 101,168 4,914 16
Visitor Accommodation 12,834 15,298 2,464 13
Restaurants, Bars & Cafes 16,346 17,821 1,475 22
Retail 91,134 92,823 1,689 3
Other 169,230 167,882 -1,348 -12
3 Gisborne Airport B (Industrial) 100,637 105,977 5,340 14
Heavy Manufacturing 237 2,591 2,354 5
Warehousing 6,103 6,480 377 1
Other Industry/Servicing 93,737 96,198 2,461 6
Other 560 708 148 2
Comments on the above residential growth areas in respect to the wastewater activity are –
1) Tiniroto A and Makaraka D (Western Industrial Area)
The growth model projects some 16,000m2 growth in the GFA of non-residential activities in Tiniroto
A and Makaraka D (the Western Industrial Area) between 2006 and 2021. This represents a growth
in GFA of 39%. All of the projected growth is in Heavy Manufacturing, Warehousing and Other
Industry and Servicing activities. The growth is equated to only 36 „household unit equivalents‟
according to the standard equivalence factors. However actual demands may be more significant
due to the conservative nature of these equivalence factors.
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There is a project, Western Industrial Ring Main, to lay a new pipe from Makaraka to increase the
capacity and provide an improved fire-fighting service to the Western Industrial Area. The project has
been delayed due to land access and confirmation of alignment of the main. The horizontal and
vertical alignment must ensure that the water pipes have adequate protection but that depth is not
excessive. Excessive depth could cause long term significant maintenance issues. It is expected that
this alignment will be finalised and the water pipe laid in year 2009/10. There is currently only
minimal spare capacity in the existing water main servicing this area and, until the main is
constructed, minimal development can occur. Growth has been limited in this area to date and this
deferral of the project has not caused issues.
Existing properties have paid a water fee based on their demand as a contribution to the installation
of the existing water main. This will have to be readdressed when the new Western Industrial Ring
Main has been completed.
Developments requiring a higher fire fighting service than the planned service will be required to
install onsite storage and pumps.
2) Gisborne Central
Growth of about 9,200m2 in the GFA of non-residential activities is projected in Gisborne Central
between 2006 and 2021. This represents a growth of 2% in GFA and equates to about 42
„household unit equivalents‟ of growth, in addition to the 183 households projected over this period.
Existing infrastructure should be capable of accommodating this growth, with the possibility of some
local upgrades. The hydraulic model will be updated regularly to monitor capacity. Subdivision
support funds from development contributions will utilised if upgrades are required.
3) Gisborne Airport B (Industrial)
The growth model projects a growth of about 5,300m2 in the GFA of non-residential activities in this
area between 2006 and 2021 (5%). This equates to only 14 „household unit equivalents‟. However
actual demands may be more significant due to the conservative nature of these equivalence
factors. Existing infrastructure should be capable of accommodating this growth.
5.2 Trends
Climate Change Trends
One significant issue facing the region in the future and in the face of climate change will be access
to and allocation of water. The demand for water will be affected by the climatic changes affecting
soil moisture levels and the supply of water will be affected by changes to rainfall and the
subsequent runoff to streams, recharge to aquifers and through roof-top collection systems.
The current insignificant growth projection for the Gisborne region does not appear to put more
demand pressures for domestic water. It is more difficult to predict the commercial demand given
that there will be changes in industry trends. There will also be changes in agricultural and
horticultural demand driven by both climate change and changing land use patterns.
Peak daily water demand in Gisborne is usually at the end of an extended dry, hot spell of 10 days or
more. If such events increase with climate change, then the number of peak days can be expected to
increase.
Natural resource: surface and groundwater
Key climate variables: average rainfall (monthly, seasonal, annual)
Climate change effects: decreased rainfall in the north and east of New Zealand
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Key risk: decreased security of water supply
Uncertainty: average decreases in rainfall appear more likely in the east of New Zealand
The following trends due to climate change have been extracted from the MfE document ‘Preparing for climate change - A guide for local government in New Zealand’ published in July 2008. These are largely influenced by predictions of changes in rainfall and temperature. The possible effects of climate change on water infrastructure will be associated with:
Possible larger variations in water volumes.
Reduction in the quality of the raw water sources.
Sedimentation in the source rivers (Te Arai and Waipaoa) and weed/algae growth in the source dams (Williams, Clapcott and Sang).
Changes in type/distribution of pest species.
Economic Trends
The predicted economic trends relating to the operation and maintenance of the Water Supply Utility
are summarised below as they relate to the various aspects of the service.
Price increases have largely been a product of transportation (price of oil) and power increases.
There have been significant price increases in products as the global demand for steel and
petroleum based products, furthermore the cost of transportation and electricity has increased. For
August 2008 to July 2009 the following price increases in materials are expected:
Modified plastics (PVC, ABS, MDPE ect.) 20 - 30%
Treatment chemicals (Chlorine, PACL, HFA, Lime) 12 -15%
Concrete prices (Reinforced concrete pipes) 10-15%
Cast iron and ductile iron products have increased 20 -30%
Technology Trends
The following technological changes are expected to impact on Water Supply network management
and practices.
Advances in pipeline renovations including trenchless technologies.
Continued use of hydraulic modelling, including model calibration.
Leisure Trends
No Leisure trends have been identified in this Activity Management Plan. Leisure trends that may
impact on the Water Supply Utility will be revisited and investigated for the next Activity Management
Plan.
Social Trends
No Social trends have been identified in this Activity Management Plan. Social trends that may
impact on the Water Supply Utility will be revisited and investigated for the next Activity Management
Plan.
Demand Management
The capacity of the current public potable water supply system is sufficient to meet the existing
future-projected needs; however the demand for the system to service large industrial operations
and the servicing of residential areas can put significant pressure on the water available especially
during summer evenings. Much of this water is being used for garden irrigation and this puts
pressure on the existing water supply, treatment and reticulation network.
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Future Demand Management Approach
The future demand management approach centres on the Demand management Plan in this section
of the Activity Management Plan.
The objective of the demand management plan is to:
Reduce water demand
Adopt all reasonable and practicable measures to achieve an efficiently operated system
To eliminate any sources of identified leakage
Definitions relating to Demand Management of the Water Supply include:
Term Definition
Unaccounted for Water The difference between the amount of water supplied from the
treatment plant to the consumer (via water meter) and measured
water use (hydrant use, mains flushing, etc)
Actual Water Loss Water loss due to leaks and illegal draw off
Night Time Flow The amount of demand during the night (1am – 4am) over and above
the minimal consumption anticipated. This indicates possible leakage
in the network
Non-Asset Solution A solution that does not involve altering or repairing the water supply
asset to reduce water consumption
Demand Management A plan to reduce total water use and promote water reuse both by the
consumer and more efficient network operations
Demand Management Plan
The Demand Management Plan involves implementing strategies to minimise the loss of water in the
water network. These strategies involve altering or repairing the asset to achieve the target. The loss
minimising strategies used by Gisborne District Council are outlined in Table below.
Table– Demand Management Loss Minimising Strategies
Strategy Description
Leak Detection A proactive Leak Detection programme ensures the percentage of
treated water lost through leakage is minimised.
Response Time Prompt response and rectification of reported leaks
Replacement /
Rehabilitation
Programme
The Renewal Programme as described in this plan to ensure
assets are not utilised beyond their useful life when the risk of
unidentified failure and leakage is greatly increased
Code of Practice Enforcement of the Engineering Code of Practice to ensure all
maintenance is carried out to the relevant standard
Technical Standards Ensuring new assets are constructed to the correct standard and
tested before being put into commission as specified in this plan
Standard Materials The use of standard (high quality) materials as specified in this
plan
Quality Audits To ensure all standards above are being met
Network Model The analysis of the network model to indicate areas where
consumption is higher than anticipated to focus leak detection
programmes
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The Demand Management Plan also involves implementing non-asset strategies to manage the
demand for a service. Non-asset solutions used by Gisborne District Council are outlined in the table
below.
Demand Management Non Asset Strategies
Strategy Description
Water Conservation /
Public Education
Encouraging Water Conservation through public education and
advertising campaigns
Water Restrictions Water Restrictions are used as a necessary tool to reduce peak
demands that are unable to be met by the current system.
Water Metering Water Metering and invoicing of consumption increases
consumer‟s awareness of water use and therefore reduces
unnecessary water use.
New Domestic
Technology
Encourage the adoption of new technologies in the home such as
low flow showerheads and dual flush toilets
Sustainable Development/Operation
Sustainable development takes into consideration the impact on the environment of the activity of
humans as we develop the environment we live in to suit our wants and needs.
Therefore, Gisborne District Council encourages sustainable development and minimising the impact
on the environment is minimised through the following strategies:
Operating the treatment plants efficiently to minimise backwash discharges
Further issues and strategies will be developed following the Water Assessments and included in the
next revision of this Activity Management Plan.
Monitoring of Demand
The reticulation is monitored for performance relating to water consumption by:
Comparison with the network model for pressure loss areas and potential leakage
Industrial consumption is monitored via water meters
Average household consumption is calculated as a desktop exercise
Illegal connections are monitored for during routine maintenance
This data is analysed periodically to indicate trends in consumption and identify target areas in the
reticulation for leak detection and programmed maintenance.
Network Model
A network model is employed to simulate water network from source to consumer. This is done by
creating a model of the network complete with attributes such as pipe diameter, material and
hydraulic grades and then adding demand at points throughout the network to simulate domestic
and industrial demand. These demands are configured to mimic how demand occurs throughout the
day with peaks in morning and evening and lows at night.
Opus international Consultants Ltd has completed development of the model for Gisborne District
Council.
A network model is useful for:
The design of new systems
Assessment of network capacity
Compliance with fire fighting regulations
Design for optimising pressure zones within reticulations to reduce water losses
Investigations of pumping times to save costs.
The model,
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The current water model is being continually updated as changes to the network occur such as
renewals and upgrades or as changes to asset attributes are identified, however to confirm its
accuracy the model is yet to be calibrated. The calibration takes place by taking field measurements
from flow meters out of reservoirs and key locations and pressure monitoring throughout the
reticulation.
Capital Works resulting from Demand Management
As a consequence of the demand management issues installation of universal water metering for
Gisborne City is programmed pending Council‟s decision. This is only one method in which demand
management can occur as finalisation of the most preferred method will be deduced after the
establishment of a Demand Management Plan (see Sections 6: Options and Choices and 7:
Improvement Plan). Universal Metering will enable accurate identification of unaccounted for water.
Targeting reduction of and measuring of unaccounted for water will then be possible.
Implementation / Improvement Plan
The strategies employed for the demand management plan will be continually updated as new
technologies become available.
Following the installation of universal water metering in Gisborne City the demand management plan
will be reviewed to include the additional data this makes available to engineers for the tracking and
analysing of water demand.
Renewals, Capital Expenditure and Depreciation
It should be noted that currently the remaining economic life is the primary driver for replacement of
an asset. It is intended to develop a more detailed framework for the application of the Advanced
Asset Management factors. This will be developed for future revisions of this Plan.
Renewal works identified in terms of the renewal strategies may be deferred if the cost is beyond the
community‟s ability to fund. This can occur when higher priority works are required on other
infrastructural assets, or there are short term peaks in expenditure, or if an inadequate rating base
exists.
It is recognised that the deferral of some items of work will not impede the operation of the assets in
the short term, however to continue to defer renewals is to create a liability and increase the risk of
asset failure to the point where levels of service cannot be maintained.
When renewal work is deferred the impact of the deferral on economic inefficiencies and the
system‟s ability to achieve the required service standards will be assessed.
This funding renewal profile varies from the asset renewal profile as detailed in Appendix X (available
on request).
This variation has occurred due to:
• The implementation of Advanced Asset Management Techniques since renewal expenditure was
promoted.
• Revaluation of assets has occurred since renewal expenditure was promoted.
• Adoption of BERL indices as a basis for inflation.
• Balancing renewal expenditure with financial availability on a corporate scale.
This variation in the next three years is minor. Variations outside this window will be reviewed at the
next review of the Activity Management Plan.
Table 12 compares the forecasted renewal requirements and the ability of depreciation funds for the
next 10 years.
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The Future Asset Development Approach
Capital works are those works that create a new asset that did not previously exist, upgrade or
improve an existing asset beyond its previous design capacity.
Assets are acquired as a result of:
Taking over new reticulation constructed with subdivisional development (constructed at the
developer‟s expense).
Extensions constructed by Council to service new areas.
Asset upgrading constructed by Council to:
o provide additional system capacity to overcome inadequacies in level of service or
provide for growth, for example larger pipes, pumps, and treatment capacity
o meet new standards, for example additional treatment facilities to remove
cryptosporidium and giardia
o meet legislative requirements such as hydrant flows.
Creation/Acquisition Plan
The water supply systems will be developed to meet community expectations, technical and
environmental standards and growth projections over the next 20 years.
New works are identified on the following basis:
Regulatory - expenditure needed to meet new regulations, for example modified resource
consents as a result of Resource Management Act or water quality requirements.
Consumer demand.
Growth - ability to meet the most likely demand projections.
Operation efficiency - to reduce costs and improve efficiency.
The selection criteria for the prioritising and programming of asset development projects is a
function of Council preference, consideration of risk, costs and benefits, affordability and ranking
with other projects.
Project approvals will be supported by an economic appraisal using cost/benefit analysis techniques
which take into account:
Capital costs of various options.
Any change in net annual operating costs.
Any change in annual maintenance requirements.
Any salvage value of existing assets or components.
Within a subdivision the developer shall meet Council standards and specifications. On satisfactory
completion the public portion of these assets will be vested in the Council.
Creation/Acquisition Standards and Specifications
Council standards and specifications for the construction of assets will reflect the best current
technologies, national standards and legislative requirements. All new water assets constructed by
Council or acquired from subdivisions or developments will be built in accordance with the Gisborne
District Council Engineering Code of Practice.
The Code of Practice is due to be updated in 2008/09 updated to incorporate relevant experiences
and changes in best practice and will form the technical basis of all development and renewal
contracts.
Once new projects / capital expenditure is identified it is promoted to the Corporate Management
Team who assess the proposed projects along with other corporate spending. Projects are there
assessed as to feasibility and affordability in consideration of all Council activity. The priorities listed
below are those projected promoted for the coming 10 years, the Future New Capital Works
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Programme shows those items approved through the management team for final adoption by
Council.
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6. How we plan to get there
6.1 Options and Choices
Options have been considered in this section only for a specific project selection. These projects
have been selected for discussion as they are judged to be the most significant in terms of their
impacts on the following issues:
Financial
Cultural
Environmental
Social
Potential for the project to have a significant community profile
The Capital Works Programme and specific operational projects are being developed in accordance
with the Local Government Act 2002 requirements. This will be a structured process that ensures all
alternative options are considered, justification for the works is recorded, and the consequences of
not undertaking the work are assessed.
A complete list of the proposed projects for the water activity is included in Appendix C: Financial
Information.
Although renewals are a significant financial item options have not been considered for them.
Renewals are required to maintain the integrity of the water supply asset. If renewals are delayed
eventually emergency repairs will need to be carried out on the asset. These will likely have a higher
relative cost of carrying out the renewal and at greater inconvenience to the community. Planning of
renewals creates opportunities for contractors to better price, notify and plan work. Therefore it is
crucial that all of the renewals as included in the budget are proceeded with.
Options for subdivision support projects have also not been considered. Allowing for predicted
growth at the time of the subdivision is always going to be the most prudent option as the other
options would be do nothing or to attempt to get the developer to upsize for future growth. The
former would mean excavating twice, double-up of infrastructure and disposal of relatively new
assets. The latter would be unfair, illegal and would stifle some subdivisions altogether. Subdivision
support will result in the extension of the existing asset.
DWSNZ:2005 Compliance Projects
CAPEX Project – CX5 & CX6
Rural Townships: Te Karaka and Whatatutu Water Supply Upgrades (subject to CAP funding)
Urgent need for Water Supply upgrades as identified in the PHRMP documents. These upgrades aim
to improve the water quality both treatment wise and aesthitically, satisfy the Protozoal compliance
criteria of the DWSNZ:2005 and reduce maintenance costs attributed to the current setup. Project is
subject to a successful Capital Assistance Program (CAP) grant by the Ministry of Health.
Feasible options:
Provided a Ministry of Health funded Capital Assistance Program (CAP) application is
successful; design, build and commission a new water treastment facility and carry out
improvements on the water supply system
Do nothing/Status quo: Continuation of non compliance with DWSNZ:2005 and high
operational and maintenance costs due to a high breakdown rate. .
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These budgets are based on cost estimates by GDC staff from the PHRMP Improvement Plans.
95% of the funding for these projects is most likely to come from the CAP grant from the Ministry of
Health due to these communities being classed as 10 (the highest possible) on the Drinking Water
Assistance Programme Deprivation Index. A score of 10 is regarded as “a supply most likely to
receive CAP funding‟. The remaining 5% will have to be loan funded.
CAPEX Project – CX4
Distribution: Hospital Hill Chlorine circulation improvements
According to the PHRMP risk assessment, Hospital Hill Reservoir has stratification and mixing issues
with Free Available Chlorine (FAC) because of its volume and the inlet halfway up the wall. This has
been identified as “extreme” in the priority scoring because of the potential for Bacterial Non
Compliance in the DWSNZ:2005.
This project aims to produce a solution for poor Chlorine circulation. On completion, this solution will
aid in improving the lateral and vertical circulation of the water and inhibit stratification issues which
have an adverse effect on the accuracy of Chlorine testing and .
Feasible options:
Study, design and construct a process and/or device that will effectively and efficiently mix
the volume of water within each Hospital Hill Cell.
Do nothing/Status quo: Leave system as is and accept risks associated with current
situation. Risks include potential DWSNZ:2005 Bacterial Non compliance.
This budget is based on cost estimates obtained from a report by OPUS Consultants who followed up
recommendations from the PHRMP Improvement Plans.
Demand Management Planning Projects
On deciding on the best option for effective demand management planning the establishment of a
Demand Management Plan (OPX16) must initially be completed. If application for funding is
successful, this is programmed for 2009/10. This will then determine what approach will be taken
and will finalize the best method/s for effective demand management.
In this section there are two CAPEX projects (CX8 & CX9) that will improve security of supply which
will have a positive demand management effect on the Water Network. These are the only options at
this stage as we have more confidence in pricing these projects. As previously stated, when the
Demand Management Plan is established, other options may eventuate and the best method/s will
be determined.
OPEX Project – OPX16
Water Utility: Establish Demand Management Plan
Establish a Demand Management Plan to provide standard protocols/procedures and a programme
which will have a positive demand management effect on the Water Network. This project aims to
plan for future demand/capacity for growth, avoid unnecessary upgrading or installation of assets by
developing a most cost/benefit effectiveness programme and increase the level of security of supply
for the Water Network.
Feasible options:
Develop and implement a Demand Management Plan for the Water Supply System.
Develop and implement a Demand Management programme and recommend best projects
taking costs/benefits into consideration.
Do nothing/Status quo: Leave issues as is and accept risks and costs associated with the
current situation. Risks include lack of planning for future demand, unnecessary upgrading
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of raw and treated storage water, no increase in security of supply and no provision for
capacity for growth.
This budget is based on cost estimates obtained from a report by OPUS Consultants whom followed
up recommendations from the PHRMP Improvement Plans.
CAPEX Project – CX8
Distribution: Universal Metering
Universal metering for domestic consumers could be implemented as one of several demand
management tools for the Water Network. This project is a highly successful water conservation and
demand management tool which aims to reduce the risk of having to upgrade storage facilities,
increase the security of supply and will provide capacity for growth.
Feasible options:
Install meters on all domestic and commercial connections on the Water Reticulation
Network. It will also involve replacement of older style Toby manifolds that aren‟t compatible
with the model of water meter chosen for mass installation.
Approve a different demand management project in place of this which may be cost
effective.
Do nothing/Status quo: Leave issues as is and accept risks and costs associated with the
current situation. Risks include lack of planning for future demand, unnecessary upgrading
of raw and treated storage water, no increase in security of supply and no provision for
capacity for growth.
This budget is based on a calculation of current installation costs (Fulton Hogan Ltd) and the number
of connections which need water meters to be installed.
CAPEX Project – CX9
Waingake Catchment: Williams Dam Storage increase
The increase of storage capacity in the Williams Dam could be implemented as one of several
demand management tools for the Water Network. This project has the capability to provide capacity
for growth and offer an increase in security of supply at the source by ensuring all practicable steps
are taken to reduce the risk of restricted or loss of supply due to high consumption and low rainfall
(as occurred in autumn 2007).
Feasible options:
Design and build an extension on the 'Morning Glory' overflow. Carry out project according to
the recommendations noted in the Mangapoike Dams Safety Review Report by OPUS
Consultants Ltd and any future design specifications.
Approve a different demand management project in place of this which may be cost
effective.
Do nothing/Status quo: Leave issues as is and accept risks and costs associated with the
current situation. Risks include lack of planning for future demand, unnecessary upgrading
of raw and treated storage water, no increase in security of supply and no provision for
capacity for growth.
This budget is based on cost estimates obtained from a report by OPUS Consultants who assessed
all three Dams on their current state and condition. From this, recommendations and price
estimates were made and included this project.
Strategic Asset Management Projects
CAPEX Project – CX10
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Waingake Catchment: Clapcott Dam supply main replacement
Currently, peak demand flows solely from the Clapcott Dam are not being achieved due to hydraulic
constraints of the 300mm dia. supply main between the dam and the Damline Pumpstation.
To allow an even use of the Williams and Clapcott Dams and greater versatility of the different
source supplies the installation of a larger pipeline is required. This project has been identified as a
medium priority in the PHRMP risk assessment process.
Feasible options:
Install a 450mm pipeline from Clapcott Dam Intake Tower to the junction with Williams Dam
pipeline (approx 600m).
Do nothing/Status quo: Leave issues as is and accept risks associated with current situation.
This budget is based on cost estimates obtained from a report by OPUS Consultants whom followed
up recommendations from the PHRMP Improvement Plans.
OPEX Project – OPX21
Water Utility: Asset Componentry Condition Assessment & Renewals Program. 1 FTE for
24months
Budget for 1 FTE for 24 months to facilitate the condition assessments and renewals programme
needed to satisfy NZ equivalent to International Accounting Standard 16 (NZ IAS 16). More
effectively predict and allow for failing infrastructure.
Reasons for project:
Allow for 1 FTE for 24 months for the development and facilitation of condition assessments
and a renewals programme. Compliance with accounting standard NZ IAS 16.
Feasible options:
Approve budget for the required work to take place.
Do nothing/Status quo: Disregard condition assessment and renewals programme. Asset
componentry project is not carried out.
Figures for budget????
SNZ PAS 4509:2008 Fire Fighting Compliance Projects
CAPEX Project – CX11
Distribution: Fire Fighting Upgrade
In order to satisfy the Firefighting Code of Practice:2008 requirements of meeting the minimum
flows from hydrant and also provide capacity for growth, upgrades to selected sections of
watermains need to be carried out.
As a design and programming prerequisite, calibration of the Hydraulic Water Model needs to occur
first. This has been programmed as an OPEX project (OPX15, see Appendix C for information) for
2009/10 and finalize the sections of watermains for upgrades.
Feasible options:
After calibration of the Hydraulic Water Model, upgrade water mains identified by the
modelling process to meet the Firefighting CoP:2008.
Do nothing/Status quo: Leave system in its current state and accept the non compliance
with Firefighting legislation.
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This budget is based on cost estimates obtained from a report by Beca Stevens but as previously
stated, the number of upgrades required and the total project cost will be finalized by the Hydraulic
Water Model.
CAPEX Project – CX12
Bulk Distribution: Western Industrial Ring Main (In previous LTCCP)
The construction of a new water main between Makaraka and the Awapuni Rd water main needs to
occur to satisfy the Firefighting Code of Practice:2008 requirements of meeting the minimum flows
from hydrants and also provide capacity for growth,.
Originally programmed for 2007/08, it was delayed due to accessibility issues over private land and
is now likely to occur in 2009/10. Although postponed, it still aims to meet firefighting legislative
requirements, increase the level of service in the Western Industrial Area and provide capacity for
growth. When installed, we have confidence that all these factors will be achieved.
Feasible options:
Design and construction of pipeline which creates a ring main situation by joining the end of
the racecourse water main to the Aerodrome/Awapuni Rd water main.
Do nothing/Status quo: Leave system in its current state and accept the non compliance
with Firefighting legislation.
This budget is based on a Tender evaluation obtained by OPUS Consultants , which included the
contract price, contingencies, design, supervision and GDC on-costs.
Asset Maintenance Projects
OPEX Project – OPX5
Bulk Distribution: Te Arai Pipe Bridge repairs
Acccording to conditions assessments carried out by OPUS, the Te Arai Pipe bridge has had damage
incurred in the past during flooding events. This project aims reduce the risk of bridge failure
Feasible options:
Carry out recommendations made by OPUS in the Structural Inspection Report of Feb 2006.
Do nothing/Status quo: Leave issues as is and accept risks and costs associated with the
current situation.
This budget is based on cost estimates obtained from the OPUS Structural Inspection Report of Feb
2006.
OPEX Project – OPX6
Distribution: Hospital Hill Reservoir Waveband (Design and built 5 year priority)
Hospital Hill Reservoir is subject to a large amount of damage to the waveband during a significant
earthquake. When this occurs, replacement is needed which has a large cost associated. Project is
to design and build a waveband that will be less subject to damage, which poses the risk of vermin
contamination.
Reasons for project:
To reduce the repair/replacement costs after an event that causes the Waveband to fail. To become
more financially sustainable.
To reduce the risk of contamination from vermin entering the potable water stored in Hospital Hill
Reservoir after an event which causes the Waveband to fail.
Feasible options:
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Design and build a Waveband that when an event for its design use occurs (predominantly large
earthquakes), it will be subject to less damage and in large part, be reusable. This subsequently
reduces the repair/replacement cost and contamination risk.
Do Nothing/Status quo: Replace Waveband failures on an 'as required' basis according to the current
specifications.
This budget is based on cost estimates obtained from the Structural Inspection Report Roy Taylor
Concrete Tank Consultants from April 2008
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6.2 Implications
Project Community
Outcomes
Strategy and
policy
Levels of
service Financial Forecasts Funding Policy
DW
SN
Z:2
00
5 C
om
pli
an
ce
Pro
jec
ts
Te Karaka WS
upgrades
(subject to
CAP funding)
Safe and
Health Haven
Public Health
Risk
Management
Plan
Statutory
Compliance,
Maintain
LoS
Upgrades will create a greater
efficiency in the operation of this
system; therefore, the current
operational budget should be
sufficient.
Funding for up to 95% of the
$250,000 total is available
through the Ministry of Health
Capital Assistance Program
subsidies. Council is currently in
the application process.
Council will need to fund the
remaining money which is most
likely to be 5% of the $250,000
total.
Whatatutu WS
upgrades
(subject to
CAP funding)
Safe and
Health Haven
Public Health
Risk
Management
Plan
Statutory
Compliance,
Maintain
LoS
Upgrades will create a greater
efficiency in the operation of this
system; therefore, the current
operational budget should be
sufficient.
Funding for up to 95% of the
$250,000 total is available
through the Ministry of Health
Capital Assistance Program
subsidies. Council is currently in
the application process.
Council will need to fund the
remaining money which is most
likely to be 5% of the $250,000
total.
Te Karaka
Water Supply
Improvements:
Design and
Supervision
(subject to
CAP funding)
Safe and
Health Haven
Public Health
Risk
Management
Plan
Maintain
LoS
Further funding for this project is
not necessary as design and
supervision is only required for the
life of completing installation of the
upgrades.
Will be loan funded.
Whatatutu Safe and Public Health Maintain Further funding for this project is Will be loan funded.
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Project Community
Outcomes
Strategy and
policy
Levels of
service Financial Forecasts Funding Policy
Water Supply
Improvements:
Design and
Supervision
(subject to
CAP funding)
Health Haven Risk
Management
Plan
LoS not necessary as design and
supervision is only required for the
life of completing installation of the
upgrades.
Hospital Hill
Cl2 circ.
Improvements
Safe and
Health Haven
Public Health
Risk
Management
Plan
Maintain
LoS
Further funding for this project is
not necessary. Any issues will be
covered by the current operational
budget.
Will be loan funded.
De
ma
nd
Ma
na
ge
me
nt
Pla
nn
ing
Pro
jec
ts
Universal
Metering
Positive
Leadership
Demand
Management
Plan, Water
Conservation,
Climate
Change
Policy
Growth,
Maintain
LoS
New assets will increase
expenditure due to increased
operational expenditure.
Combination of predominantly loan
funding and some development
contributions.
Williams dam
storage
increase
Positive
Leadership Demand
Management
Plan
Increase,
Maintain
LoS
Further funding for this project is
not necessary. Any issues will be
covered by the current operational
budget.
Combination of predominantly loan
funding and some development
contributions.
Establish
Demand
Management
Plan
Positive
Leadership
Demand
Management
Plan, Water
Conservation
Growth,
Increase
LoS
After initial plan production, further
funding will only be needed for
reviews or updates. Will be loan funded.
Str
ate
gic
Asse
t
Ma
na
ge
me
nt
Pro
jec
ts
Clapcott Dam
supply main
replacement
Positive
Leadership
Public Health
Risk
Management
Plan
Maintain
LoS
Further funding for this project is
not necessary. Any issues will be
covered by the current operational
budget.
Will be funded from depreciation
reserve.
Water Utility:
Asset
Componentry
Condition
Positive
Leadership
Increase
LoS
Further funding for this project is
not necessary. Will be loan funded.
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Project Community
Outcomes
Strategy and
policy
Levels of
service Financial Forecasts Funding Policy
Assessment &
Renewals
Program. 1
FTE for
24months
SN
Z P
AS
45
09
:20
08
Fir
e
Fig
hti
ng
Co
mp
lia
nc
e
Pro
jec
ts
Fire-fighting
upgrade (In
previous
LTCCP)
Positive
Leadership
Maintain
LoS
Upgrades will create a greater
efficiency in the operation of this
system; therefore, the current
operational budget should be
sufficient.
Combination of predominantly the
depreciation reserve and some
development contributions.
Western
industrial Ring
Main (In
previous
LTCCP)
Positive
Leadership
Public Health Maintain
LoS
Upgrades will create a greater
efficiency in the operation of this
system; therefore, the current
operational budget should be
sufficient.
Combination of predominantly the
depreciation reserve and some
development contributions.
Asse
t M
ain
ten
an
ce
Pro
jec
ts
Bulk
Distribution:
Te Arai Pipe
Bridge repairs
Safe and
Health Haven Public Health
Maintain
LoS
Upgrades will create greater
security in the operation of this
system; therefore, the current
operational budget should be
sufficient.
Will be loan funded.
Distribution:
Hospital Hill
waveband
(Design &
Built, 5year
priority)
Safe and
Health Haven Public Health
Maintain
LoS
Upgrades will create greater
security in the operation of this
system; therefore, the current
operational budget should be
sufficient.
Will be loan funded.
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6.3 Preferred option
The following summarises the preferred option for the major Water supply projects scheduled in the next ten years. Table i: Proposed Water Supply Improvement Plan Programme for next 10yrs
Identifier Project Name Project Driver Description of preferred option LOS Year(s) Total
Budget
CX5 Te Karaka WS upgrades (subject to
CAP funding) Public Health (DWSNZ:2005)
Following a successful Capital Assistance Program (CAP)
application; design, build and improve on the water
supply system by studying the current situation then
initiation of the improvements to be made. These
improvements are yet to be fully determined.
Statutory
Compliance,
Maintain LoS
2010/11 $250,000
CX6 Whatatutu WS upgrades (subject to
CAP funding) Public Health (DWSNZ:2005)
Following a successful Capital Assistance Program (CAP)
application; design, build and improve on the water
supply system by studying the current situation then
initiation of the improvements to be made. These
improvements are yet to be fully determined.
Statutory
Compliance,
Maintain LoS
2010/11 $250,000
OPX 3
Te Karaka Water Supply
Improvements: Design and
Supervision (subject to CAP funding)
Public Health (DWSNZ:2005) If CAP application is successful, approve budget for the
Consultancy costs involved in the design and supervision
of the upgrading of Te Karaka Water Supply.
Maintain LoS 2011/12 $20,000
OPX 2
Whatatutu Water Supply
Improvements: Design and
Supervision (subject to CAP funding)
Public Health (DWSNZ:2005) If CAP application is successful, approve budget for the
Consultancy costs involved in the design and supervision
of the upgrading of Whatatutu Water Supply.
Maintain LoS 2011/12 $20,000
CX4 Hospital Hill Cl2 circ. Improvements Public Health (DWSNZ:2005) Study, design and construct a process and/or device
that will efficiently mix the volume of water within each
Hospital Hill Cell.
Maintain LoS 2011/12-
2012/13 $115,000
CX8 Universal Metering Demand Management, Water
Conservation, Climate Change
Install meters on all domestic and commercial
connections on the Water Reticulation Network. It will
also involve replacement of older style Toby manifolds
that aren‟t compatible with the model of water meter
chosen for mass installation.
Growth,
Maintain LoS 2016/17-
2018/19 $4,000,000
CX9 Williams dam storage increase Demand Management
Design and build an extension on the 'Morning Glory'
overflow. Carry out project according to the
recommendations noted in the Mangapoike Dams Safety
Review Report by OPUS Consultants Ltd and any future
design specifications.
Increase,
Maintain LoS 2015/16-
2016/17 $1,026,198
OPX 16 Establish Demand Management Plan Demand Management, Water
Conservation
Develop and implement a Demand Management Plan for
the Water Supply System.
Growth,
Increase LoS 2009/10 $50,000
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Identifier Project Name Project Driver Description of preferred option LOS Year(s) Total
Budget
CX10 Clapcott Dam supply main
replacement Public Health (DWSNZ:2005)
Install a 450mm pipeline from Clapcott Dam Intake
Tower to the junction with Williams Dam pipeline (approx
600m).
Maintain LoS 2014/15-
2015/16 $729,000
OPX 21
Water Utility: Asset Componentry
Condition Assessment & Renewals
Program. 1 FTE for 24months
AMP – Statutory Compliance (NZ IAS
16) Approve budget for the required work to take place Increase LoS 2010/11 $75,000
CX11 Fire-fighting upgrade (In previous
LTCCP)
Statutory Compliance (SNZ PAS
4509:2008)
After calibration of the Hydraulic Water Model, upgrade
water mains identified by the modelling process to meet
the Firefighting CoP:2008
Maintain LoS 2011/12-
2012/13 $481,280
CX12 Western industrial Ring Main (In
previous LTCCP)
Growth Model – Security of supply for
large industry
Design and construction of pipeline which creates a ring
main situation by joining the end of the racecourse water
main to the Aerodrome/Awapuni Rd water main
Maintain LoS 2008/09-
2009/10 $1,074,182
OPX 5 Bulk Distribution: Te Arai Pipe Bridge
repairs Public Health (DWSNZ:2005) Carry out recommendations made by OPUS in the
Structural Inspection Report of Feb 2006 Maintain LoS 2010/11 $73,500
OPX 6 Distribution: Hospital Hill waveband
(Design & Built, 5year priority) Public Health (DWSNZ:2005)
Design and build a Waveband that when an event for its
design use occurs (predominantly large earthquakes), it
will be subject to less damage and in large part, be
reusable. This subsequently reduces the
repair/replacement cost and contamination risk
Maintain LoS 2011/12-
2012/13 $100,000
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7. Improvement Plan Council is committed to an ongoing improvement philosophy, and plans to progressively review and improve Councils asset management planning. The
improvement plan detailed in the Table below outlines the steps Council intends to take in order to improve various aspects of the Stormwater Activity as
they have been identified within this activity management planning document.
Project Issue Planned Improvement Target Date
M an
ag e m en t Pl
an s Demand Management
Plan
Currently no plan exists to reduce total water use,
promote water conservation to the consumer and
Establishment and implementation of a Demand
Management Plan. 2009/10
Imp
rove
me
nt
of
Info
rma
tio
n a
nd
/o
r S
yste
ms Sanitary Survey
Unknown land use and faecal and/or chemical
contamination risks within the Waipaoa River
catchment.
Consultants to conduct a Sanitary Survey of
farmland properties at 5 yearly intervals. Results will
help determine where any potential contamination
issues could eventuate from.
2013/14
Asset Componentry:
Overall Strategy
Treatment Plants and Pump Stations are recorded in the
asset management computer program as whole assets,
which do not give maintenance records, renewals,
lifecycle and depreciation costings for the components
within these areas of the water network. Understanding
of the asset is insufficient in this area.
Condition assessments and renewals program
developed for each component within the Treatment
Plants and Pump Stations. 1 FTE for 24 months
applied for funding also.
Initial funding applied
for 2009/10-2010/11
Telemetry Upgrade:
Gaddums Hill and Hauroa
Rd
Unknown status of Gaddums Hill and Hauroa Rd during
abnormal operation due to no remote access available.
CAPEX funding needed to complete telemetry
installation at these remote sites, which will allow a
greater monitoring and operation capability for the
Water Operations Staff.
2010/11
Condition Assessments:
Pipe Bridges
Insufficient data on the main trunk line pipe bridges
condition to successfully set up a renewal program.
Depreciated for replacement in 2025.
Conduct a condition assessments and produce a
renewals program to ascertain a timeline for
implementation in the 2014/15 AMP
2012/13 – Needs to
be completed before
the writing of the
2014/15 AMP.
Condition Assessments:
Pipe
Insufficient data on the reticulation condition to
successfully set up a renewal program and
determine/verify water model calibration figures.
Conduct a condition assessments and produce a
renewals program to ascertain a timeline for
implementation in the 2014/15 AMP
2009/10-2018/19
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manage the network in a more efficient manner.
Drought Management Plan
Currently no contingency plan exists to reduce total
water use, promote water conservation to the consumer
and manage the network during a drought.
Establishment and implementation of a Drought
Management Plan when a drought is occurring. 2010/11
Algae Management Plan Currently no contingency plan exists for the occurrence
of an algal bloom.
Establishment and implementation of an Algae
Management Plan to reduce the risk of an algal
bloom or when it is occurring.
2010/11
Emergency Response Plan
Currently we are updating the contingency plan that
gives guidelines on what to do during an emergency
situation.
Establishment and implementation of an Emergency
Management Plan. 2011/12
Activity Management Plan Old, out of date information. Needs revision and
updating every three years.
Consistent updating of the background data for the
AMP‟s before the writing of the AMP‟s. These include
condition assessments, new project estimates and
old project revision, updates of the renewal program
and processing of any projects identified since the
production of the previous AMP.
Revisions in years
2011/12, 2014/15,
2017/18
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8.0 AMP Review and Monitoring
To ensure this plan remains useful and relevant the following process of AM plan monitoring and
review will be undertaken:
Formal Adoption of the AMP by Council.
Revise AMPs annually to incorporate and document changes to work programmes and new
knowledge from a variety of sources including results of improvement programming.
The following table details the activity and timetable adopted to achieve these objectives.
Activity Action Target Date
AM Plan Review and
Development Adoption of AMP by Council
Annual Review of AMP context
o Check AMP content for
consistency with Council
programme and plans.
o Compliance with AM
improvement
programmes
o Effectiveness and
adequacy of AMP
processes systems and
data.
Full review of the AMP and
external peer review of technical
content.
External review of AMP
information by Audit NZ.
Jan/Feb 2009
XX each year
May to October (3
yearly)
November 08to
January 09 then
three yearly.
Condition Data Review Condition Assessment
information.
Levels of Service Review service performance measures
(including public consultation process)
and formally adopt levels of service
Measure actual level of service and
report in Annual Report
Annually with fuller
review 3 yearly.
Risk Register Annual Review of Risk Register Annually with fuller
review 3 yearly.
AMP Monitoring
The following indicators will be monitored to measure effectiveness of this AMP.
Indicator Measure Source of
Information
Compliance with legislative
requirements Unqualified Audit opinion
relating to AMP outputs
Audit NZ reports
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Quality of services delivered Increasing, or 100%
compliance with LTCCP /
Annual Plan targets.
Quarterly Activity
Reports and Annual
report
Quality of risk management No event occurring outside
risk profile
Audit of risk register
Compliance with
documented quality
assurance processes for:
- project prioritization and
financial planning
- data management,
customer service
requests
- risk management
- contract management
and supervision
- improvement
programme
implementation
100% compliance with quality
processes
Quality audit results
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Appendices
Appendix A - Levels of Service
LTCCP (15) – WATER SUPPLY
RATIONALE: The water supply activity is to provide the community supplied with public water primarily that is clean and safe. Secondary objectives are that the water should always be
available, at a suitable pressure, free from odour and taste issues, and is produced in an environmentally friendly, sustainable and affordable manner.
WATER SUPPLY
Levels of Service Statement
Performance Measure
Current
Performance
Targets
Data Source
Driver
Customer Technical
Yr 1
2009-10
Yr 2
2010-11
Yr 3
2011-12
Yr 4-10
2012-18
To Achieve Changes to
Target (Strategies,
Compliance, Efficiencies,
A)pproach
LOS (1) - Core Value:
Health and Safety
Provide water that is clean and
safe to drink, bath and wash
Number of complaints per
annum regarding water quality 21
(2008) 21
Decreasing
Trend
Decreasing
Trend
Decreasing
Trend
Contact Centre Report
- Water Quality
Effective protozoa
treatment.
Compliance with NZ
Drinking Water Standards
Achieved
(2008) Achieved Achieved Achieved Achieved GDC samples and
protocols to comply
with:
NZDWS
Effective protozoa
treatment.
Number of public advisory
notices issued to boil water
Zero
(2008) Zero Zero Zero Zero MoH Compliance
NZDWS
Effective protozoa
treatment at water plants.
LOS (2) - Core Value:
Quality
Water is available at an
Number of Requests for
Service regarding water leaks;
and
101
(annual average
2005-2008)
100 100 100 100 - 80 Contact Centre Report
- Water
Effective and efficient
maintenance contract and
renewals programme.
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WATER SUPPLY
Levels of Service Statement
Performance Measure
Current
Performance
Targets
Data Source
Driver
Customer Technical
Yr 1
2009-10
Yr 2
2010-11
Yr 3
2011-12
Yr 4-10
2012-18
To Achieve Changes to
Target (Strategies,
Compliance, Efficiencies,
A)pproach
appropriate pressue, free from
taste and odours and produced
in an environmentally,
sustainable and affordable
manner
The percentage of requests
resolved within target
timeframes.
80%
(2005-2008) 80% 82% 84% 86% - 90% Improving customer
satisfaction.
Number of events regarding no
water / or low pressure 50
(2008) 50
50
50
50 - 45
Contact Centre Report
- No Water
Effective and efficient
maintenance contract and
renewals programme.
Percentage of residents who
are very / fairly satisfied with
the water supply system
75%
(June 2008) 75%
N/M
82%
Year 4 - N/M
Year 5 - 10
86%
2 yearly Communitrak
Survey
Demand management
strategies. Better
customer focus through
maintenance contract and
operations within Utilities.
Water provided
continuously and without
restriction in compliance
with the maintenance
contract for up to a 50 year
drought in the Gisborne
region.
Achieved
(2008) Achieved
Achieved
Achieved
Achieved
Maintenance Contract
Reports
Demand management and
source water review and
strategy.
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Appendix B – Asset information
Asset Info – Graphs Reticulation Material Type
0.00%
5.00%
10.00%
15.00%
20.00%
25.00%
30.00%
35.00%
40.00%
AC Cast
Iron
Epoxy
Lined
MDPE PVC ST-CI Other
Materials
% P
ipe L
en
gth
Material type of the reticulation system is largely dependant on installation date. Early pipes were
made of cast iron, in the 50‟s to 80‟s AC mainly used. Since the 1980‟s plastic have dominated
material types being installed.
Reticulation Age
0%
5%
10%
15%
20%
25%
30%
35%
0-5
6-2
5
26-4
5
46-6
5
66-8
5
86-1
05
106+
Remaining Life (Years)
% P
ipe L
en
gth
The pipe ages are reflective of the city development and expansion.
Reticulation Condition
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0
10
20
30
40
50
60
70
80
1 Very Good 2 Good 3 Moderate 4 Poor 5 Very Poor
Condition Grading
% P
ipe L
ength
Recent cast iron rehabilitation, lead pipe replacement programme and the relatively recent
installation dates means all assets are moderate or better.
Reticulation Performance
The good performance is a reflection on the condition and age of the reticulation. * Definition of Performance and Criticality Gradings:-
Grade Condition Performance Criticality
1 Very Good Always meets target service
standards.
No significant adverse short-term impact.
2 Good Almost always meets target service
standards.
Failure will cause localised and serious
disruption to service delivery.
3 Moderate Generally meets target service
standards.
Failure will cause localised and serious
disruption to service delivery, possible
health and safety effects and / or loss of
critical data.
4 Poor Does not generally meet target
service standards.
Failure will cause serious disruption to
service delivery over a substantial area,
possible health and public safety effects.
5 Very Poor Never meets target service
standards.
Widespread and serious disruption to
service delivery, possible health and public
safety effects.
0
10
20
30
40
50
60
70
80
1 Very Good 2 Good 3 Moderate 4 Poor 5 Very Poor
% P
ipe L
ength
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Asset Condition, Capacity/Criticality, Performance and Life
Gisborne City Water Supply (GCWS)
GCWS Collection/Source: Condition
Earthquake Damage
On December 20th 2007, the Gisborne region experienced an earthquake measuring 6.6 on the
Richter Scale. This caused the GDC Utilities department to carry out post event inspections as soon
as practicable. This inspection list included all structural water assets and initially found the all
Mangapoike Dams to be of relatively good condition.
Because these assets are high priority, Utilities then commissioned an inspection to be carried out
by OPUS Consultants. The scope of work included the following:
A visual inspection of Clapcott, Sang and HC Williams Dams covering all outside and inside
surfaces where accessible.
A full photographic record of items of interest.
Advise of any initiatives/recommendations to be implemented or earmarked for further
investigation.
Estimated cost of the work recommended.
After the Engineers inspection, his report included the following results:
Reservoir Type of Construction Condition
Clapcott Concrete arch Inconclusive due to vegetation overgrowth.
Sang Earth Generally in good condition.
HC Williams Earth Generally in good condition.
HC Williams Dam
The water quality within the dam is generally of high quality. Compressed air is used during summer
to prevent stratification. Testing of the different depths within the dam has indicated a large portion
of the water can be used on a continual basis. This has been concluded through the use of nutrient
testing, oxygen and temperature analysis. Further testing of the dams will continue to establish the
operating regime for taking of water to achieve a consistent and reliable water quality.
Due to risks associated with earth dams, a control monitoring programme to monitor both movement
and settlement of the dam exists. Monitoring to date has shown no issues.
A formal inspection programme has been developed and implemented. Regular mowing of the grass
embankment is undertaken.
The water source is generally considered secure although poaching and some illegal cannabis
growing does exist within its catchment and has the potential to compromise the water supply
although the risk is not considered high. Any further areas around the actual intake consist of
forestry plantings but do not discharge into this catchment. The catchment is part of the Hawkes Bay
Catchment which is located on the Wharerata Hills, the divide between Gisborne and Wairoa.
Council‟s consents for this dam lie with the Hawkes Bay Regional Council.
Clapcott Dam
The Clapcott Dam is a concrete arch dam and is showing signs of some deterioration; however it is
generally in good stable condition.
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A seismic analysis of the structure has been undertaken by Works Consultancy and a life of
200years has been assigned to this structure. The dam receives compressed air from a compressor
pump to ensure that stratification of layers does not occur.
Annual monitoring of water leaks is taken on the dam face to monitor deterioration. To date leakage
is stable and monitoring will continue. Localised leakages will be plugged on an “as required basis”
as part of routine maintenance.
Sang Dam
The condition of the Sang Dam is good.
Te Arai Bush Catchment and River
Te Arai Bush Catchment consists of 1,100 ha of land of huge intrinsic value as a gene pool for flora
and fauna. It remains the finest example of undisturbed dense native bush on East Coast soft hill
country. The area boasts diverse vegetation and soil character. It has a QEII designation on the land.
The catchment is inspected aerially on an annual basis for slips, vegetation die off or other factors
that could affect water quality.
The main operational issues regarding this area are the control of pests (possums, goats, pigs) and
to a lesser extent disease. Council as a result undertake regular sanitary surveys.
At the lower end of the catchment a concrete weir was constructed as an inlet for the capture of the
Te Arai River. The Bush Catchment provides 40% of the City‟s current water. Some maintenance
issues surround the effective operation of the screen washing system. A condition and operation
check will be carried out to determine if improvements need to be made. These have been identified
and inserted into the Gisborne City Water Supply Public Health Risk Management Plan (PHRMP).
For the purposes of water supply it provides a high quality source. While the water rises beyond a
turbidity level impractical to treat during heavy rain, it returns to a practical level far quicker than
surrounding catchments. For example, it is the norm rather than the exception to bring the river back
on line within 24 hours of heavy rain while the river downstream is still of an unacceptable quality -
due to tributaries past the bush line.
Waipaoa River
The Waipaoa River is the source water for the Waipaoa Augmentation Plant. The Waipaoa River has
the second highest sediment loading of any river in the world and hence the extraction intakes have
been placed below stream bed level, to allow some filtering before extraction. Entire catchment
control is difficult due to its extent however district land use plans do provide some regulation of use.
To improve knowledge of potential faecal and/or chemical contamination risks, a project has been
proposed to involve a Sanitary Survey of the Waipaoa River catchment. Further detail is included in
Section 7: Improvement Plan.
GCWS Collection/Source Pump Stations: Condition
Damline Booster Pump Station
As a consequence of its critical nature the previously existing DC motor has been replaced and
upgraded with an AC motor, in combination with the replacement of the variable speed controllers,
due to their unreliable nature. The refurbishment of the existing site is now complete and the high
level maintenance is undertaken on this site, by both mechanical and electrical means and it
remains in a fairly new condition. Site reliability of all equipment is high and reflects the level of
maintenance and inspections that occur.
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Maintenance checks are monthly, vibration analysis being undertaken on a six monthly basis, now
extended to yearly with the establishment of historic data and regular checking of all electrical items
on the site, with specific use of infrared protection equipment to identify hot spots within all
switchboards ensuring site condition is maintained to a high standard.
Fairview Booster Pump Station
High level maintenance occurs at this critical site and therefore the mechanical and electrical
equipment is in excellent condition.
The overall condition of the site is excellent and being of a new construction, no perceived
maintenance problems exist. This site is deemed a critical component and therefore high level
maintenance and monitoring occurs.
Waipaoa Intake Pumps
The condition of these pumps is good and has had relatively small usage since installation. An active
monthly check and maintenance programme ensures reliable serviceability.
Emergency Bores
Condition of the bores is high with only one historic problem, being a leak in the existing wiring
causing a burn out of the electric motor. This occurred in Cameron No. 2 and required extraction,
refurbishment of the electric motor and replacement of the electrical cables.
Routine maintenance is undertaken on these bores on a monthly basis with a run up of
approximately one hour to ensure they reach operational temperatures and maintain that for a
defined period. Draw down tests have been performed with motors being run over a 24 hour period.
Council will continue to maintain these bores for emergency provisions.
GCWS Collection/Source: Performance
An extensive quality manual system has been developed to control and direct the operation and
hence the performance of these dams and water supplies. Details are in the “Headworks, Waingake
and Waipaoa Work Instructions Manual”.
Also, extraordinary events that could have a large effect on the performance of the Mangapoike
Dams are droughts and Algae issues. These have been identified as high enough in risk to propose
the establishment and implementation of a contingency and management plan. Further details into
these proposed projects are included in Section 7: Future Improvements.
HC Williams Dam
HC Williams Dam is the largest earth dam in the region and consists of a water intake for supply
purposes, an internal spill way (morning glory) which discharges excess water through the dam wall
to a controlled spill way below the earth dam. An emergency spill way is located to one side of the
earth dam should excess rain occur and the internal spill way cannot cope. The intake structure at
the dam works well although the condition is unknown.
Water is conveyed from the Williams Dam through a 450 mm diameter concrete lined steel pipe via
two Booster Pump Stations (Damline and Fairview Booster Pump Stations) and connects to a
common supply pipe with the Te Arai bush intake. It then gravitates to the Waingake Water
Treatment Plant some 8 km from the dam itself.
Algae have been suspected to have an effect on filter run length. A monitoring programme has been
established by NIWA to measure the algal levels in the dam which is part of the Algae Development
Plan identified in the Gisborne City Water Supply PHRMP (proposed new project for Results from
samples have been analysed but are yet to be interpreted. The operators are currently continuing the
sampling program to gain further data. The dams are on an active cycling programme in an effort to
ensure the water turns over adequately within the dam.
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The introduction of trout to control algae has been investigated and in consultation with Fish and
Game NZ a viable consideration. The issues preventing this are; one there is no river entries into the
dam itself meaning no spawning ground for trout all stock will therefore need to be introduced, and
two Fish and Game are not in a position to supply trout unless the dam lakes were opened to the
public for recreational fishing which introduces access and potential contamination issues.
Lamination or stratification within the dam has been identified to occur. Compressed air is blown
into the dam through a perforated pipe to de-stratify the water body.
Clapcott Dam
Clapcott dam has a more significant algae population with water sourced from Clapcott showing the
shortest filter run than either Williams or the bush catchment. In early 2005 Clapcott was dosed with
Copper Sulphate to reduce the algal population. Algae has been monitored by NIWA since then and
the results reflect a low concentration on Algae due to insufficient nutrient level within the Williams
and Clapcott Dams. The Water team has been advised that this low nutrient level is also to low to
sustain an Algal Bloom.
Previous inspections by divers showed the intake valves were no longer functional and replacement
was required in order to restore serviceability. Full replacement of the valves, valve key stand-pipes
and all intake tower bolts and nuts eventuated and was completed in 2007/08. These upgrades
occurred because of re issuing Capital Works funding, originally allocated to the Waingake
Emergency Intake fund, to this project.
Performance is now restricted by the pipe outlet size from the Dam. The existing line is a 300mm
pipe that feeds into a 450mm pipe prior to the first Booster Pump Station. This creates a problem
that when the Clapcott Dam is solely used; the Booster Pump Station cannot operate at 100% as the
pump trips out on low suction pressure. In order for this to be rectified the 300mm line will need to
be upgraded. This has been noted in the Gisborne City Water Supply PHRMP.
Lamination or stratification within the dam has been identified to occur. Compressed air is blown
into the dam through a perforated pipe to de-stratify the water body.
Sang Dam
The Sang Dam is the emergency storage dam that feeds into Clapcott. This dam is the smallest and
shallowest and therefore most susceptible to major algal population explosions. Because Sang Dam
is drained into the Clapcott Dam for abstraction, the water quality effects on filter performance is
unknown. Sang dam was used as an experimental testing area for Copper Sulphating to ensure
copper and sulphate residuals were acceptable post dosing. These trials were successful and lead to
the Clapcott dosing.
This dam is cycled periodically via a siphon.
Te Arai Bush Catchment and River
The main operational issues regarding this area are the control of pests (possums, goats, pigs) and
to a lesser extent, disease originating from these pests. Council as a result undertake regular
sanitary surveys.
At the lower end of the catchment a concrete weir was constructed as an inlet for the capture of the
Te Arai Stream. Maintenance requirements are low and generally problem free. The weir is flushed
from a 7,000 L chamber serviced from the dam‟s line that works on an automatic siphon system.
This chamber was installed at the time of the weir and its condition and effectiveness needs to be
confirmed.
A report has been completed by Opus Consultants to extract more water from this river. A pumped
take would be required to maximise the take which conflicts with pumped flows from the
Mangapoike Dams in summer. This option is not considered economically justified due to the
availability of the Waipaoa Augmentation Plant, but also, there is proposed legislation (National
Environmental Standard for the Measurement of Water Takes) requiring the water operations to
leave a minimum flow in the river which is currently not the case. Current resource consents allow
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the full usage of the Te Arai Stream to be obtained. This proposed legislation could affect the
performance immensely due to reduced supply capacity.
Due to the RL‟s of the dams and the bush intake, a break pressure chamber is required to dissipate
the energy of the water coming from the dams. This chamber works well but is thought to introduce
air into the pipeline reducing its capacity. Several changes have recently been made to reduce the
introduced air problem and initial signs are good but the full effect will not be known until further
monitoring is completed.
There has also been discussion over some time about replacing this chamber with a micro-power
generation scheme. A project report on this option has been produced by Works Consultancy which
in 2007/08 was reviewed by an independent engineer. After reviewing the original report he
concluded that, while the project costs and benefits are now substantially different, the project
warrants serious consideration. For the year 2008/09, GDC will carry out a feasibility study
concerning this option and the findings of the study will determine if this will be cancelled or
pursued.
Waipaoa River
Water quality of the Waipaoa River is poor. Heavy sediment loads mean that this water source is
difficult to treat however the Waipaoa Augmentation Plant has been specifically design to
accommodate this.
The regional arm of council has established a minimum river flow of 600 l/s at the Matawhero
Bridge and 1.3m³ per sec at the Kanakanaia Bridge at which restrictions may be applied. These
flows have never been reached and restrictions never applied. It is thought that when the river is in
low flow condition, water drains from the surrounding aquifers supplement the normal water flows.
GCWS Collection/Source Pump Stations: Performance
Energy Audit Report
In early 2007, via Economic Development: GDC, Utilities commissioned Power Solutions Ltd to
conduct an Energy Audit on the Water Supply System which included the Collection/Source Pump
Stations. The scope of work included the following:
Investigate efficiencies that can be gained within the main city water supply system and
prepare a report.
Advise of any initiatives/recommendations to be implemented or earmarked for further
investigation.
Estimated cost of the work recommended and estimated savings expected.
Recommendations for implementation from this report (Gisborne District Council – Water Supply
System Energy Audit – Oct 2007) are included in the Improvement Plan.
Damline Booster Pump Station
The gravitational flows from the three Mangapoike Dams is limited to a maximum of 500 m³/hr, any
flows above this requires additional booster pumping and the main pump station that achieves this
is the Damline Booster Pump Station. Damline Booster Pump Station runs full-time through summer
and approximately a third of the time during winter.
Due to its key role in providing summer flows, a second stand-by pump exists on this site with pump
duties being rotated. The site is telemetry monitored to identify faults and has the provision for a
stand-by generator to be connected to it in an emergency situation. The power supply in this area is
of poor quality and interruptions to supply can be expected.
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Two pumps exist on site, one as duty pump, the other as stand-by in recognition of the criticality of
this site. Maximum flow from the pump station can vary dependent on the dam levels. Gravity flow
can be achieved from this site with no pumping at 500 m³/hr. The existing combined maximum flow
of DLB and Fairview Booster Pump Station (FVB) are 1,200 m³/hr, a potential maximum flow of
1,530 m³/hr is possible with an upgrade of the Fairview booster pump which will be discussed with
Fairview Booster Pump Station. Due to treatment plant constraints with dealing with this quantity of
water, it is envisaged that this option would not be pursued to achieve its maximum output given
also that the Waipaoa Augmentation Plant is available, and the cost benefit would not be achieved
with a capital upgrade of Fairview Booster Pump Station, until such time as population demand
would dictate which is not perceived in the next 20 years.
Its remote nature both from Gisborne and the Waingake Water Treatment Plant has some
operational constraints which have generally been overcome by the use of telemetry system and
remote control. We see this as an integral part of its operation, but can be run on-site without the
use of system controls.
Fire issues we believe is the highest risk for this site, and accordingly a risk assessment of the
options for mitigation have been undertaken. The methods of extinguishing fire would render the
electrical equipment inoperative and would in effect cause an equal amount of damage, therefore
additional site security and maintenance activities are undertaken to minimise the risk of fire on this
site. The risks of its non-operation have been minimised due to the availability now of the Waipaoa
Augmentation Plant and that a combination of gravity feed Te Arai Bush Catchment and the Waipaoa
Augmentation Plant, supply can be maintained, but depending on the time some levels of service
may be compromised until remediation work occurs on any damage.
Fairview Booster Pump Station
Fairview Booster Pump Station is an auxiliary pump station containing one pump and requires
Damline Booster Pump Station to be running at 80% revs or more, to prevent it tripping out on low
suction pressure. Fairview Booster Pump Station provides an additional 200 m³/hr flow to Damline
at full flow. Fairview Booster Pump Station runs for approximately two months of the year, during the
peak of summer.
To increase the overall supply, it is possible with changing of the existing pump system to achieve
1,530 m³/hr by increasing the pump size to a 500 kW. As previously mentioned, with the
requirement to upgrade the treatment plant to cope with the additional increase coupled with the
existence of the Waipaoa Augmentation Plant, there is no plan to implement this strategy.
Provision has been made on the FVB site for an additional pump and is conceivable could operate in
tandem with the existing one.
Waipaoa Intake Pumps
These pumps perform in order to supply the design flow rates between 180 to 790 m³/hr (50-
220l/sec). They are operated by automatic or manual control and are adjusted to work in series or
parallel in order to supply volumes required.
The pump station is constrained by the extraction rate from the web screens in the Waipaoa River
and regular maintained maintenance must occur to ensure full functionality. However, during periods
of high demand access to the screens is not possible and contingency reviews have meant that an
emergency intake has been constructed. Additional intake provides additional security and will have
the added benefit of a lower amount of sediment being pumped into the settling ponds.
Emergency Bores
During Cyclone Bola three emergency bores were constructed, Hansen Road, Cameron Road No. 1,
Cameron Road No. 2. These bores are run up monthly to ensure the performance of these assets is
up to a suitable standard. The Cameron Rd No. 1 bore is currently leased to Riversun Nursery who
utilise water for grape rootstock watering. Their bore pump is currently installed with the agreement
that they may have only 24 hours notice to remove it should Council require it.
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The discharge from the Cameron Road Bore No.2 is pumped monthly, discharge occurs to the
Taraheru River. Hansen Road Bore is also pumped to ground monthly.
Recharge on these bores is unknown as they have never been operated for an extended period of
time. Modelling at resource consent stage suggests there is sufficient volume for Council to meet
emergency needs it may have to utilise the bores for. Pump tests indicate the consented volumes
and rates of the takes are sustainable. Water quality is poor with a high iron content causing
significant quality issues.
Emergency Bores Cameron Road No. 1 Cameron Road No. 2 Hansen Road
Water Quality
Manganese g/m³ 0.107-0.170 0.107-0.170 0.198-0.240
pH 7.14-7.45 7.14-7.45 7.17-7.49
Hardness (Total) g/m³ 360-430 360-430 410-460
Ammonia g/m³ 4.7-6.2 4.7-6.2 5.3-7.0
Total Iron g/m³ 2.3-3.4 2.3-3.4 1.5-1.9
GCWS Collection/Source: Capacity and Criticality
HC Williams Dam
HC Williams Dam was constructed in 1974 and has a total capacity of 2,291,864 m³, a useable
capacity of 1,833,491 m³ and is at elevation of 473.5 m above sea level. Maximum depth of the
dam is 14.25m.
It is supplied by a catchment of 254.9 ha which is uninhabited and consists of secondary regrowth
generally being Manuka.
Should additional capacity be required at the HC Williams Dam the dam structure has been designed
to accommodate this. The existing governing factor is the „Morning Glory‟ a concrete overflow
structure which limits the height of the water in the dam. This is not seen as a required option to
meet future demands but may be considered under the scope of demand management. In March
2008, Opus Consultants produced a report of the Mangapoike Dams which included
recommendations of raising the „Morning Glory‟ height. The optimum workable recommendation is
raising the height 300mm. If this were extended then additional capacity could be created. Further
details on this project are in Section 6: Options and choices.
This asset is highly critical as it provides essential summer storage and a reliable water supply when
the bush catchment is too turbid to provide water to the treatment facility.
Clapcott Dam
Clapcott Dam was constructed in 1948 and has a total capacity of 1,121,365 m³, a useable capacity
of 896,500 m³ and is at elevation of 472.9 m above sea level. It is supplied by a catchment of 148.9
ha which has similar characteristics to the HC Williams Dam. Maximum depth of the dam is 11.6m.
Should additional capacity be required at the Clapcott Dam the dam structure has been designed to
accommodate this. The existing governing factor is the spillway crest, an overflow structure within
the main dam wall which limits the height of the water in the dam. This is not seen as a required
option to meet future demands but may be considered should the situation arise. In March 2008,
Opus Consultants produced a report of the Mangapoike Dams which included recommendations of
raising the spillway crest height. The optimum workable recommendation is raising the height
150mm. If this were extended then additional capacity could be created.
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Clapcott Dam is a storage dam to provide water through summer demand when the Te Arai River is
flowing at its lowest. It also acts as a buffer for winter flows when the Te Arai River is running turbid.
Sang Dam
The smallest of the three dams, Sang Dam is a 1972 earth dam that holds a total and useable
capacity of 347,568 m³. Elevation of sang is 514.7m and has a maximum depth of 8.6m. The
catchment area for Sang is 41.1 Ha.
0
500
1000
1500
2000
2500
Sang Clapcott HC Williams
Reservoirs
000's
m3 Capacity
Useable Capacity
Catchment Area (ha)
Te Arai Bush Catchment and River
The Bush Catchment provides 40% of the City‟s current water. Winter take averages 500-600 m³/hr
while summer take averages 100-200 m³/hr. During periods in winter following heavy rainfall events
entrained sediment negatively affects water quality to a point where it becomes untreatable using
the direct filtration configuration of Waingake. During these periods the bush take is isolated and
dam water only is utilised.
Waipaoa River
The Waipaoa river supply is highly critical. Gisborne has been fortunate that the last significant
natural disaster to directly affect the urban area was Cyclone Bola in 1988. The criticality of the
Waipaoa WTP and the Waipaoa River for water supply is often over looked there.
0
500
1000
1500
2000
2500
Waipaoa Te Arai
Source: Waipaoa Area (km2), Te Arai Area (ha)
Average Flow (Daily)
Catchment Area
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CGCWS Collection/Source Pump Stations: Capacity and Criticality
Damline Booster Pump Station
The maximum delivery with this pump station operating is approximately 1000m³/hr. The actual
volume is controlled by a variable speed drive. Without this pump station operating volumes limited
to 500 m³/hr³ are conveyed to the treatment plant. During winter this is probably acceptable in most
conditions, except when heavy rainfall means no river water can be taken. During peak summer
demand conditions this would surely mean the city would run out of water and thus has a high
criticality.
One issue for Damline is that the outlet from the Clapcott Dam is only 300mm. When Damline
operates at 100% the 300mm line is of insufficient capacity to deliver the water fast enough and the
pump station trips out with low suction pressure. This problem is not experienced from Williams Dam
as the outlet pipe is larger being 450mm. Of the proposed major Water Supply projects for the next
10 years, the replacement of the 300mm outlet main with a 450mm is included in this. Further
detail is in Section 6: Options and Choices.
Fairview Booster Pump Station
Fairview increases flow to the Waingake water treatment plant by an additional 200m³/hr. As a
contingency the implementation of a variable speed drive will allow Fairview to run independently
and would provide some level of redundancy from any failure of the Damline booster.
Fairview becomes a critical site for approximately six weeks a year at the very peak of the summer
demand. This is somewhat mitigated if the timing of running up Waipaoa Augmentation Plant
coincides with those peaks.
Waipaoa Intake Pumps
These pumps deliver the volume for the Waipaoa facility and can deliver up to 720m³/h. Without
these pumps the Waipaoa facility will not be able to function. They therefore have a very high
criticality.
Bores
Pump stations exist at the 2 emergency bore sites. Cameron Road site has two bores and Hansen
one. All bore have separate pumping structures and would be utilised only in extreme emergencies
(i.e. Civil Defence scenarios) when surface water supplies become contaminated or unusable. The
last time these were operated for water supply was March 1988 when cyclone Bola destroyed the
main supply line. Since then the Waipaoa Augmentation Plant has been constructed to further
reduce the likelihood of abstraction for drinking water from these bores.
The capacities of the pumps are such that it would not meet the required demand of the City and
major water restrictions would be necessary. This is an excepted position given the likely
circumstances which they would be used.
GCWS Collection/Source: Life
Future life of the storage facilities varies. These are all being depreciated. As these stations near
replacement they will be condition assessed and replaced from the depreciation reserve as required.
The next condition assessments due are the Trunk Main Pipe Bridges which have a depreciated
remaining life of 16 years. This has been recognized since the 2004 Activity Management Plan and
further details on this project are in Section 7: Improvement Plan.
Install Date Structure Age Base
Life
Remaining
Life Comments
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1/01/1962 Power Transmission 46.5 44 -2.7 Currently being programmed.
In progress.
1/01/1991 Cathodic Protection 17.5 17 -1.0 Relates to 'Cathodic
Protection Additional'
30/06/2006 Cathodic Protection Additional 2.0 17 15.0 Should be completed around
November 08
1/01/1962 Pipe Bridges 46.5 63 16.0
1/01/1962 Self-supporting Pipe Bridges 46.5 63 16.0
30/06/2008 New Inlet Valves Clapcott Dam 0.0 50 50.0
1/01/1948 No1 Dam - Clapcott 60.5 200 139.5
1/01/1972 No 1A Dam - Sang 36.5 400 363.5
1/01/1974 No 2 Dam - HC Williams 34.5 400 365.5
GCWS Treatment: Condition
Waingake & Waipaoa Treatment Plants
All equipment, mechanical and structural components for the treatment plants are in excellent
condition and reflect the recent construction dates of these sites.
Any foreseeable future capital expenditure will be due to an increase in standards rather than
condition or performance related issues. Recent maintenance of the components at Waingake has
ensured that most of the equipment is in good condition and is unlikely to need replacement in the
next 5 years. Electrical and mechanical components may need replacement before the asset is
renewed, where this occurs this will be done within the existing operational budgets and not
capitalised as the replacement is maintaining service potential not increasing the asset life or
upgrading performance. Structural renewals will be completed as part of the renewal programme.
GCWS Treatment: Performance
The performance of the treatment facilities is excellent. In stating this there is a recognition that the
plants are in a continual improvement status with fine-tuning occurring, as we understand the assets
to a more detailed level. The most likely future addition that can be projected at this point would be
the possible future use of ultra-violet light (UV) to remove and provide higher level of security for both
cryptosporidium and giardia removal, than that provided within the current system at both Waingake
Treatment and Waipaoa Augmentation Plants.
GCWS Treatment: Capacity & Criticality
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The capacity of the Waingake Treatment and Waipaoa Augmentation Plants are adequate to meet all
current demands and predicted future demands.
The additional demand from the proposed extensions of the water supply reticulation into the
Western Industrial Area, the Taraheru Residential Area and potentially Makaraka can all be catered
for through the use of existing assets and the currently identified CAPEX work. Meeting the current
demand may involve running the Waipaoa Augmentation Plant for up to three months in summer to
supplement the supply. Demand Management Strategies will however be put in place and will have
an effect on this. This is further detailed in Section 5.2: Trends and Section 6: Options and Choices
(Universal Metering and Williams Dam Storage Increase).
The capacity of Waipaoa is adequate as this is usually only run during peak demands, maintenance
on the Waingake Water Treatment Plant and in emergency situations.
Supply of water for irrigation from the water supply reticulation can cause very high and in some
cases unsustainable demand during summer. As this is not the targeted use of the water supply this
is not considered essential demand and hence not be included in the planning window.
Waingake Water Treatment Facility
The treatment plant can currently process a winter maximum of 1450 m³/hr, in reality the summer
peak throughput is more like 1300 m³/hr. This lower volume is a resultant of the restricted
availability of water coming onto the plant. A maximum of 1200 m³/hr is available from the dam
supplies with all pump stations running and the remainder from the Te Arai River source. The
maximum daily throughput is accepted as being around 31,000m³ the volume to town is less
(28,000m³) due to water being required for backwashing of the filters where up to 3000 m³/day can
be required.
A future capacity review of the Waingake Water Treatment Plant has been undertaken. The original
long-term objective was to increase the outflow of treated water from the plant to 35,000 m³ per
day, which meant that approximately 38,000 m³ (inflow) would need to be treated to account for
system losses from backwashing of the filters. The review clearly identified the inadequacy of the
existing clarifier and the need for additional filters to achieve the required outflow. Additional
pumping on the supply mains would be required to deliver the additional quantities to the treatment
plant as well. Given that Gisborne District Council has an additional water treatment plant with the
Waipaoa Augmentation Plant, it was not recommended to pursue any future upgrading of the
Waingake Water Treatment Plant in the foreseeable future, until such time as demand or the
necessity to process high turbidity water and meet a high consistent outflow from the plant is
required. This should somewhat be alleviated with the development of a Demand Management Plan
as noted in the Section 6: Options and Choices & 7: Improvement Plan.
Waipaoa Augmentation Plant
The Waipaoa Augmentation Plant was constructed from the recovery process during Cyclone Bola in
March 1988. During this event the Gisborne City became quickly aware of its isolation and
dependency on the Waingake facility. As part of the rebuilding process it was identified that an
alternative water source and treatment facility was required and the Waipaoa Augmentation Plant
was constructed and commissioned by 1991 to augment the existing Waingake supply.
Waipaoa Augmentation Plant has the ability to produce water volumes up to 720m³/hr or 17000m³
per day although it is possible to deliver up to 880m³/hr or 21,000 m³ per day onto the plant.
Typically these volumes would only be required during emergency conditions and during routine
operations 8640m³ per day would be expected.
Waipaoa, while it has not been fully utilised, has shown on a number of occasions the critical role it
plays in the overall provision of water services. During drought events in 1998 and the low dam
period of 2004/05, Waipaoa was able to augment supply ensuring residential and commercial
customers noticed no reduction to their level of service. Should Gisborne continue to develop
industrially, Waipaoa also is a critical supply link for water.
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GCWS Treatment: Life
The treatment facilities are comparably new with reference to many other facilities nationwide. Life
expectancy of these two assets is the same, at 44 years. These assets are being depreciated
annually and when they have reached their economic life will be replaced using this financial
reserve.
GCWS Distribution: Condition
Distribution Reservoirs
A weekly inspection of the reservoirs is undertaken by water treatment staff. This inspection is to
ensure site integrity and to monitor chlorine residuals within the stored water. Following is an
overview of those items with identified condition issues, good condition can be assumed if not
identified otherwise.
Earthquake Damage
On December 20th 2007, the Gisborne region experienced an earthquake measuring 6.8 on the
Richter Scale. This caused the GDC Utilities department to carry out post event inspections as soon
as practicable. This inspection list included all structural water assets and initially found the all
reservoirs within the city to be of relatively good condition. The exception to this was Hospital Hill
Reservoir which obtained extensive damage to the waveband and crack damage to the pillars
supporting the roof.
Utilities then commissioned an inspection to be carried out by Concrete Tank Consultants. The scope
of work included the following:
A visual inspection of Knob, Hospital Hill and Taumata Reservoirs covering all outside and
inside surfaces.
A full photographic record of items of interest.
Preparation of report with recommendations of scope for further investigation.
Estimated cost of the work recommended.
A prioritisation of the work required in the form of a 10 year maintenance programme.
After the inspection, the report included the following results:
Reservoir Type of Construction Condition
Knob Hill
Post-tensioned cast in situ concrete walls with
reinforced concrete dome roof and reinforced
concrete floor.
Good subject to minor repair work. Roof in good
condition and walls in remarkably good condition for
its age.
Hospital
Hill
Cast in situ floor, walls and roof. Roof supported
independently by columns.
Good apart from cracking of columns and damage
to waveband.
Taumata
Reinforced concrete walls set in the ground.
Reinforced concrete floor and a corrugated steel
roof.
Remarkably good condition considering age. Known
to be subject to vermin and similar ingress.
Recommendations for implementation from this report (Gisborne District Council – Visual Inspection
of Three Reservoirs – April 2008) are included in Section 6: Options and Choices.
Hospital Hill Reservoir
Due to the recent earthquake, the reservoir condition is currently being addressed. This reservoir has
been condition assessed and from the results of a report from Concrete Tank Consultants, an
improvement plan has been established. As far as sedimentation goes, there is a minimal residue
because of the recent cleaning and super-chlorination by Fulton Hogan contractors. Further planned
inspections will be undertaken to monitor any further deterioration. At this stage this monitoring will
be met within the maintenance budget.
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Knob Hill Reservoir
The rate of sedimentation within the reservoir is considered minimal and the historic five yearly
cleaning has been extended to seven years. This was last completed in 2007/08 in conjunction with
the condition assessment by Concrete Tank Consultants. Following the remaining cast-iron
rehabilitation work, we believe that this is likely to go out to approximately 10 years. Replacement of
joint sealant will be periodically undertaken following routine inspections and performed as part of
normal maintenance. A report was undertaken on the seismic reliability of the reservoir and also a
risk assessment of a future building site was undertaken. The recommendation is no additional
reservoirs should be placed beside the existing one, but all other factors of performance are
adequate for the existing reservoir.
Taumata Reservoir
Taumata Reservoir is the oldest of the reservoirs but overall structure is in sound condition. The roof
was replaced three years ago due to wind damage so is in excellent condition. The reservoir is
inspected when empty for sealing issues. These inspections highlighted poor sealing that has since
been repaired. The pipe line that feeds the Taumata Reservoir is both an in and out line and this
pipe line was upgraded five years ago as part of a risk assessment of the reservoir structures. No
major capital expenditure is budgeted for this reservoir in this asset management plan, and all
needs will be meet from the yearly operational budget.
High Level Storage
The Gaddum‟s Hill tanks have been subjected to some land instability since installation. Monitoring
is occurring on the amount of movement that is occurring. The tanks positions have not moved in the
past three years and monitoring will continue at this site.
Hauroa Road tanks may also be subject to stress and the inlet line has been noted to have a stress
kink in it. Monitoring is occurring on this site and to date no immediate action is required.
GCWS Distribution: Condition Pump Stations
Waipaoa City Pumps
The condition of these pumps is good and has had relatively small usage since installation. An active
monthly check and maintenance programme ensures reliable serviceability.
Makaraka Booster Pump Station
The motors are DC motors and were over-hauled in 1996. High maintenance occurs on this site as
part of on-going efficiencies, operational changes and minor upgrades have taken place to improve
the efficiencies, an example being the use of split seals replacing the requirement for historic
packing to prevent leakage from the bearings of the pumps. This has successfully prevented leakage
of water from the pump bearings and reduced the friction and hence reduced the power
requirements.
The pump station building is of A frame construction and is of excellent condition. The roof and
internals have recently been repainted and no immediate maintenance is envisaged. Internally the
21 inch City main is above ground for pumping purposes and is in good condition within the pump
station. Cathodic Protection does exist for the City pipeline, but due to electrical interference with the
control and electrical appliances it is a requirement to electrically separate the Cathodic Protection
from the internal electrical components on the site. This is not an issue as no corrosion is expected
for pipe work above ground.
Ormond Road Booster Pump Station
This pump station is relatively new and its condition reflects that. The above ground cabinet and
control gear is housed in a sturdy cover. The pumping equipment is below ground and is housed in a
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concrete well chamber. The condition of the pumps is good. An active monthly check and
maintenance programme ensures reliable service.
Taumata Reservoir Pump Station
The condition of this pump is good considering the age of the motor but it has had initial problems
pertaining to the setup of this system. After monitoring and making improvements to counter issues,
it now shouldn‟t need any improvements that are known at this time. An active monthly check and
maintenance programme now ensures reliable serviceability.
Gisborne High Level Pump Stations
The condition of the high level pump stations is good. Active weekly monitoring and inspection
programmes identify issues as they arise. Routine maintenance occurs proactively as part of the
reticulation maintenance contract.
GCWS Distribution: Performance
Hospital Hill Reservoir
The two cells are 300 mm different in height, with the roof being supported by internal beams to
provide a gap between both the roof and the reservoir walls, to allow water to be dissipated over the
sides during a major earthquake event where wave action within the reservoir will occur.
Lamination is known to occur in the reservoir. It is unclear if this is temperature stratification or due
to water flow path. This is largely managed by operational methodology but it does require additional
investigation and action as per the Gisborne Water Supply PHRMP. Further details are included in
Section 6: Options and choices as one of the major water supply projects proposed for the next 10
years.
Knob Hill Reservoir
Knob Hill performs well and meets the operational requirements for current normal demand, but
there are some issues when the City is in peak demand. This has been identified by the use of the
Gisborne Water Model. Access to this site has been a health and safety issue with the track being
4wd only.
Taumata Reservoir
Historically this reservoir has operated during periods of high pressure when gravity can push the
required water to its elevation. Being the highest of all reservoirs, an operational change to system
pressures has meant that filling under normal operating situations cannot be achieved. To ensure
that future over-pressurisation of the reticulation does not occur, it is proposed to use one of the
existing emergency pumps which Council owns for the extraction of water in emergency from the
Waipaoa River will by the issue of this report have been constructed to pump water up to the
Taumata Reservoir. Information from this upgrade will be included into the asset management plan
as an improvement upgrade.
High Level Storage
The existing tanks all have an external water level indicator. The water level in the tanks is controlled
by a bermad altitude valve.
Locations that have specific items are;
Einstein Street has poor access and operationally has difficultly turning water over. This site
will be reviewed as part of the fire fighting upgrades programmed.
Hauroa road lower tanks have little or no turn over except when water is demanded for fire
fighting.
Hauroa road upper tanks
Mercury switches at Pah hill and Hauroa road need to be upgraded to allow better control
of volumes stored.
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Gaddums Hill tanks have subsided and require tank levelling.
Access lids on all high level storage reservoirs have been identified as a potential source for
contaminant entry. Modifications to these entry hatches were carried out but after an extended
period since installation, this design will need further investigation.
Installation of equipment at some of the High Level Pump Stations has been identified in the
Gisborne Water Supply PHRMP. This is to reduce the risk of having an inadequate water supply to
the households feeding off the High Level Storage Tanks. Further detail is included in Section 7:
Improvement Plan.
GCWS Distribution: Performance Pump Stations
Energy Audit Report
In early 2007, via Economic Development: GDC, Utilities commissioned Power Solutions Ltd to
conduct an Energy Audit on the Water Supply System. The scope of work included the following:
Investigate efficiencies that can be gained within the main city water supply system and
prepare a report.
Advise of any initiatives/recommendations to be implemented or earmarked for further
investigation.
Estimated cost of the work recommended and estimated savings expected.
Waipaoa City Pumps
The performance of these pumps is good and has had relatively small usage since installation. An
active monthly check and maintenance programme ensures reliable serviceability.
Makaraka Booster Pump Station
During gravity flows the water still flows through the pump station as flow is controlled by a Bermad
control valve during gravity conditions. This valve is by-passed when the pumps are running. With the
pumps operating at full capacity it is possible to create negative pressure on the suctions side of the
pump and hence is carefully monitored and operated within defined parameters. The minimum
suction pressure between 10pm and 6 am is 100kPa, during 6am to 10pm the minimum is
increased to 200kPa as demand dictates. The actual volume that this delivers is variable depending
on pipeline water demand prior to the pump station. Operation of the Makaraka Booster is controlled
by the work instructions developed as part of the quality system of this site.
Three pumps exist on-site with two running in tandem at any one time, the other operating as a
standby pump with all pumps being rotated to achieve equivalent usage. Control of the pumps are
provided by the use of Alan Bradley SLC500 PLC‟s, with monitoring being provided by Abbey
Telemetry System. The site can be run manually.
The site has stand-by power for monitoring only, and if a power cut occurs, so will the pumping
capability of this site, but the power system is capable of having a generator connected. This was
last successfully utilised during the Y2K changeover and required an electrician for several hours.
The on site stand-by power that is provided allows the control of the gravity valve and also continues
to provide telemetry information of the site status.
Ormond Road Booster Pump Station
Ormond Road is run to provide additional volume over to Knob Hill reservoir. The performance of the
Ormond Road Pump Station is very good. Operation of the Ormond Road Booster is controlled by the
work instructions developed as part of the quality system of this site.
Taumata Reservoir Pump Station
The performance of this pump is good considering the age of the motor but it has had initial
problems pertaining to the setup of this system. After monitoring and making improvements to
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counter predominantly high temperatures and cooling issues, it now shouldn‟t need any
improvements at this time. An active monthly check and maintenance programme now ensures
reliable serviceability.
Gisborne High Level pump stations
The performance of these pump stations is generally good. Some issues arise in summer demands
where it is possible for these pumps to loose prime and require resetting. These issues are relatively
small and easily overcome.
Hauroa Road doesn‟t operate on a daily operational basis to service consumers as the mains
pressure fills this high level storage. It is required however when fire hydrants are being utilised as
the pressure from main supply is insufficient.
GCWS Distribution: Capacity & Criticality
Distribution Reservoirs
Council has three main reservoirs, Taumata, Knob Hill and Hospital Hill which provides approximately
one and a half days storage in summer and five days storage in winter. There are also a number of
small storage reservoirs within the system in order to meet demand in geographically high areas of
the city.
Hospital Hill Reservoir
The Hospital Hill Reservoir is the newest, has the greatest storage capacity and is a critical asset to
the overall performance of the reticulation system. The reservoir is divided into two cells,
independently valved and operated with one pipe feeding water in and out of the two cells. Level
control is with altitude valves requiring small hydraulic pumps to ensure adequate closure. Council
has made provision for an additional storage cell to be constructed on this site, but it is not
envisaged that this will occur within the planning horizon of this Activity Management Plan.
Knob Hill Reservoir
The Knob Hill Reservoir is a circular tank constructed of pre-cast, pre-stressed concrete and
operates with an internal float with water being delivered to and from the reservoir through one pipe.
This site is telemetered for water levels.
Taumata Reservoir
Built in 1933 Taumata is the oldest and highest reservoir in the reticulation system. It performs
adequately for the emergency purpose it serves and is regularly tested. Water is checked weekly and
turned over monthly to maintain quality.
Description Taumata Reservoir Knob Hill Reservoir Hospital Hill Reservoir
Volume m³ 3,846 8,805.6 38,517
Construction Date 1933 1961 1992
Shape Rectangular
(2 cells) Circular
Rectangular
(2 cells)
Dimensions (h x w x b) or (h x r) 4.88 x 17.68 x 26.29 7.366 x 19.507 4.5 x 69.2 x 69.2
Top Water Level 76.36 GPD 1926 67.83 GPD 1926 North 65.07 GPD 1926
South 65.65 GPD 1926
Bottom Water Level Telemetry 71.98 GPD 1926 60.46 GPD 1926 North 60.87 GPD 1926
South 61.45 GPD 1926
Level Control Manual Altitude Valve Ball Valve
Legal Description Lot 1 DP 3245 Pts Kaiti 327 x 335 c Lot 20 DP 9198
High Level Storage
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Hauroa Road High Level Storage
Hauroa Road tanks service the houses in Hauroa Road. It is a dual system, with water feeding two
upper level tanks and two lower tanks which provide additional capacity utilised for fire fighting
requirements. Booster pumping is required for fire fighting purposes. Generally the upper tank
provides all necessary water. The lower booster pump is operated on a monthly basis as part of the
normal maintenance checks and is required to run for approximately one hour. This system is seen
as a critical component to the operation of reticulation and meets Council‟s legal obligations for fire
fighting purposes and ensures levels of service are maintained.
Gaddums Hill High Level Storage Tanks
Gaddums Hill has two upper tanks and operates on identical basis to the Hauroa Road system, in
this instance the pump is required to pump water to the upper tanks with the two lower tanks
stationed beside the pump station to act as storage for fire fighting purposes and are filled under
gravity.
Pah Hill High Level Storage Tanks
The Pah Hill tanks are stationed above the highest house at the top end of Wallis Road and consist
of six interlinked domestic house tanks, with water being pumped to them from a pump station
located beside the Knob Hill reservoir. This system is considered in excellent condition.
Hill Road High Level Storage Tanks
The Hill Road high level storage services the area of Hill Road, Hillary Heights and the top end of
Russell Street. Just above the intersection of Hill Road and Ballance Street a booster pump resides
to pump water to the four upper storage tanks, and is targeted to operate during off-peak power
consumption times which have a lower rate incurred.
Einstein Street Upper Level Tanks
This tank is a 25 m³ plastic tank. Water is fed to the tank by gravity, generally at night when system
pressures are high and back feeds water into the upper Einstein Street area during high peak
periods. Generally the combination of reticulation pressure and tank pressure provides adequate
levels of service. Regular inspections are undertaken on a weekly basis.
Description Hauroa Rd Hill Rd Einstein
St Gaddums Hill Pah Hill
Volume m³ 90.8 90.8 22.7 90.8 136.2
Construction
Date 1990 1994 2007 1991 1969
Shape Circular Circular Circular Circular Circular
Dimensions (h x
w x b) or (h x d)
2 upper, 2 lower
2.74 x 3.43
4 tanks
2.74 x 3.43
1 tank
2.7 x 3.48
2 upper, 2 lower
2.74 x 3.43
6 tanks
2.74 x 3.43
Top Water Level
(DOSLI)
Upper 66.1 m
Lower 43.4 m
56.4
approx 97.12
Bottom Water
Level Telemetry
53.9
approx 94.47
Level Control Altitude/Press Altitude/Press Altitude
Valve Altitude/Press Altitude/Press
Legal Description
Pump Station:
Road reserve
adjacent to Lot 3
DP471
Road reserve
adjacent to Lot 18 DP
4833
Road reserve
adjacent to Lot 3 DP
8662
Pts Kaiti 327 &
335C
Tanks: Lot 1 DP 8474 Pt Lot 38
DP 484
Adjacent to Lot 4 DP
1221 Lot 1 DP 5299
Taumata Reservoir
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The Taumata Reservoir acts as an emergency source and is valved out from daily operational
contribution to the reticulation system. The total capacity is 3,846m³ but the outlet to the reservoir is
approximately 600mm off the floor meaning that not all of this is practically useable. This reservoir is
moderately critical and is necessary only on high water demand or emergency situations.
High Level Storage
The capacity of the treated water reservoirs and most of the high level storage tanks is adequate for
future projected demand and to meet the storage requirements for the New Zealand Fire Fighting
Code of Practice.
GCWS Distribution: Capacity & Criticality Pump Stations
Waipaoa City Pumps
Unlike Waingake, all water produced at Waipaoa must be pumped to be delivered to town. These
delivery pumps are therefore very highly critical. These pumps are able to deliver up to 720m³/h at
normal operating pressures of around 1000kPa.
Makaraka Booster Pump Station
The Makaraka Booster Pump Station was built in 1980 and is located beside the railway line at
Makaraka, approximately 2 km from the City boundary. The Makaraka Booster Pump Station
provides additional boosting of the water from the Waingake Water Treatment Plant where the limit
of gravity flow is 840m³/hr, with maximum flow with the booster pumps being 1,200m³/hr if suction
pressures are maintained at self imposed limits.
Water will continue to be supplied to the city should Makaraka become unavailable, albeit at a
reduced level. In summer this flow would be insufficient to meet the city demands. This pump station
has a high criticality rating.
Ormond Road Booster Pump Station
The Ormond Road Booster Pump Station is highly critical as it contributes three fold to the overall
asset operation.
During summer this pump station is essential to maintain Knob hill reservoir levels
Ormond road allows a consistent pumping pressure at Makaraka Booster to be achieved
It negates the need for high pressures in the reticulation to be achieved in order to
maintain levels in the major storage reservoirs of Knob and Hospital Hill
Taumata Reservoir Pump Station
This pump station has a low criticality because of two reasons:
It is not used as an online booster pump. Fills/flushes the reservoir only.
Pump station is capable of being bypassed if diesel motor fails to run. Carry out old Fulton
Hogan valving procedure to send more water towards the hospital reticulation area.
Gisborne High Level pump stations
The capacity of the Booster Pump Stations and the high level pump stations is adequate for the
projected future demand.
These pump stations are highly critical as they ensure that the fire fighting code of practice is
achieved and the reticulated supply would be unable to supply these high level subdivisions solely on
delivery pressures to the city .
GCWS Distribution: Life
Future life of the storage facilities varies. These are all being depreciated. As these stations near
replacement they will be condition assessed and replaced from the depreciation reserve as required.
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Install Date Structure Age Base Life Remaining Life
1/01/1969 Pah Hill 39.5 63 23.0
1/01/1933 Taumata Reservoir 75.5 100 24.5
1/01/1992 Einstein St 16.5 50 33.5
1/01/1990 Hauroa Rd 18.5 63 44.0
1/01/1991 Gaddums Hill 17.5 63 45.0
1/01/1994 Hill Rd 14.5 63 48.0
1/01/1964 Knob Hill Reservoir 44.5 100 55.5
1/01/1991 Hospital Hill Reservoir 17.5 78 60.6
GCWS Distribution: Life Pump Stations
Future life of the pump stations varies. These are all being depreciated. As these stations near
replacement they will be condition assessed and replaced from the depreciation reserve as required.
Install Date Structure Age Base Life Remaining Life
1/01/1980 Makaraka Booster Pump Stn 28.5 63 34.0
1/01/1990 Waipaoa T/Plant - Filter Pump Stn 18.5 63 44.0
1/01/1998 Ormond Booster Pump Stn 10.5 63 52.0
30/06/2000 Hillview Tce Booster pump station 8.0 63 54.5
30/06/2006 Taumata Reservoir Booster Pump Station 2.0 63 61.0
GCWS Reticulation Pipework: Condition Trunk Mains
The line is fully cathodic protected and additional external wrapping was provided as part of the
construction requirement. This line is recently constructed and is in very good condition, with no
major maintenance or work envisaged within the next 50 years.
The largest portions of the pipeline are located within road reserve, but in sections closer to
Makaraka extend through private property and the provisions for access and maintenance are
covered within the Local Government Act.
For valuation purposes the distribution main has been included in the overall pipe system. Most
failures that have resulted have been a result of mechanical failure of somebody hitting or digging up
the pipe. Some corrosion has occurred but was picked up as part of the Cathodic Protection work,
other failures have been minimal, and in two cases as a consequence of misalignment of the pipe.
Some factors needed for consideration when assessing the pipe condition are the following:
Rate of leaching from the concrete lining of the Trunk Main
Pitting of the steel
Exposure to the elements causing corrosion (Cathodic Protection does not work in this
situation)
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It is anticipated to take strategic samples and undertake metallurgic testing to predict future life
expectancy.
The Waingake line crosses a number of pipe bridges and self supporting spans. The condition of
these is very good.
Every joint (averaging 7 m) from the Mangapoike Dams to the City boundaries was excavated as part
of the bonding required for Cathodic Protection. This provided the opportunity to undertake repairs
on the gibault joints and to repair an external corrosion evident on sections of pipe. From this
extensive work undertaken in 1990-91 additional assurances on the condition has been gained. We
believe that the expected life of this pipe will exceed 50 years and will coincide with felling of the
trees on the pipeline corridor used to protect the pipeline and will prove a source of funding for
replacement should that be appropriate at that time. At this future time it will also be opportune to
review the future City demands and the requirements for additional dam storage in the Puninga
Basin, which if required would increase the size of the supply mains. These are decisions we believe
are beyond the requirements of the asset management plan, other than to identify the review period
and will be best made in future asset management plans.
Waingake Line Waipaoa Line
Installation Date 1940s 4/91
Material Concrete lined steel Concrete lined steel
Jointing Gibault Gibault
Length 29.6 km 6.10 km
Pipe Bridges 9 0
Pipe Spans 3 0
Cathodic Protection Yes Yes
From To Diameter Type Install Length
Clapcott DLB 300 ST-Conc 1949 1 km
HC Williams DLB/Clapcott 450 ST-Conc 1974 170
DLB Bush Intake 450 ST-Conc 1949 5
Bush Intake Waingake 450 ST-Conc 10/10/88 4
Waipaoa Intake Settlement Ponds 400 ST-Conc 1990 150
GCWS Reticulation Pipework: Condition Reticulation
The asset capacity and performance has been reviewed extensively as part of a network analysis
undertaken by Beca Steven‟s for earlier Activity Management Plans, reviewing the levels of service
relative to Council‟s legal requirements for fire fighting and a targeted level of 300kPa residual
pressure with a flow of 40 litres per minute for domestic supply. This clearly indicated the capacity
related problems and demonstrated that clearly the over-riding factor for performance of the
reticulation is for the purposes of fire fighting rather than the specific demand placed on it from
consumers. This information provided the basis and decision by Council to upgrade the existing cast
iron pipes by using hydrant flow testing to identify mains requiring relining. As a result of this testing
three categories for levels of service for the cast iron pipes was established, these are:
GCWS Reticulation Pipework: Condition Reticulation Components
As part of the specification for these components, considerable effort has focused on both internal
and external corrosion issues, and Council has used high quality, high efficient components, and
included several levels of corrosion mitigation and even considers the construction of the
components with respect to electrical potential, longevity of the coating systems, their scratch
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resistant nature and the requirement to provide additional protective wrapping on the external areas
of those components.
Council uses raised pavement markers (commonly known as cats eyes), for the identification of fire
hydrants by using a blue reflector and has proven very successful in assisting the fire service. These
are beyond the legal requirements for identification markings for fire hydrants according to the SNZ
PAS 4509:2008 New Zealand Fire Service Fire Fighting Water Supplies Code of Practice but the use
of them will be continued.
GCWS Reticulation Pipework: Performance
As part of on-going maintenance monthly measuring of cathodic potential readings, a bi-annual walk-
over of the pipeline and an annual leak detection are currently undertaken. The pipeline is seen as a
critical asset and future advanced risk management investigations will be required. As part of post-
Cyclone Bola a lot of work was undertaken to reduce the risk of damage to this line, and we believe
that this has effectively minimised the risk of failure to a satisfactory level. This will however not
negate further investigation as part of strategic planning.
Very few easements exist for the pipeline, however provision within the Local Government Act protect
and provide access for maintenance purposes of the pipeline. The largest portion of the pipeline has
been located within road reserve, but in sections closer to Makaraka extends through private
property. Some access agreements have been established with some of the owners, specifically
Opou Station, in all cases the pipe is not located on Council land.
All pipelines have control valves and air valves associated with it, which require regular inspection to
ensure their efficient performance and are part of routine maintenance procedures.
Scour valves are provided at strategic locations to allow drainage of the line should any maintenance
be required. Consent to discharge water from this has been provided for as a “permitted activity”
within the district plan.
As part of the protection programme of the supply and distribution mains, Cathodic Protection was
constructed to reduce the external corrosion of the concrete lined steel pipes. A number of beds
exist at strategic locations and we believe we have and continue to successfully extend the life of the
supply mains. The Cathodic Protection system is a series of zinc anode beds linked to a power
rectifier to induce a ground potential, to reduce the corrosion of the pipe. The rectifiers and potential
of the main is regularly monitored by Council staff, with levels fluctuating dependent on the ground
moisture conditions. On-going maintenance is required to check the performance of the cathodic
system with replacement of the anode beds nearing completion at the time of writing this Activity
Management Plan. This was started in 2005/06 and all anode beds have been replaced apart from
two sites. These will be partly upgraded to increase life and performance by December 2008.
The Cathodic Protection requires permanent supply of electricity and has an on-going annual cost as
a consequence. These costs have been allowed for in the future maintenance for the cathodic
system.
The performance of the Cathodic Protection apart from the area identified is meeting all design
requirements and is still operating well. The results from monitoring are sent on a bi-annual basis to
the original supplier to validate readings and results that have been recorded for any additional
comment on the performance of this system.
On the section of pipe known as Damline extension which covers the length from the top of the
Tarewa-Tokanui Road known as the divide, down to the Te Arai Bush intake, provides the opportunity
for micro-hydro generation and during earlier years, a report was commissioned to look at these
issues. This report was presented to Gisborne District Council and it was agreed that not being a
core business of Council, that the option of generation would be first offered to Eastland Energy, and
for them to make a proposal based on a number of scenarios, and further economic analysis.
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This report has now been superseded by a report produced by Power Solutions Ltd and facilitated by
Economic Development: GDC.
As part of the capacity performance review of the City reticulation, a full network analysis was
undertaken; An Overview of Gisborne Network Analysis dated January 1998 was undertaken by Beca
Stevens. This has now been superseded by the development of the OPUS Hydraulic Water Model
which was the result of studies and monitoring during 2006/07.
A current level of service of 300 kPa residual pressure with a flow of 40 litres per minute for
domestic supply was used. This clearly indicated any capacity related problems and demonstrated
that the over-riding factor for performance of the reticulation is for the purposes of fire fighting rather
than the specific demand placed on it from consumers. Although the overall capacity of the network
was found to be adequate some capacity enhancing work on cast iron mains was identified as well
as specific capital development works.
??? identifies renewals required to meet domestic levels of service as they currently exist and the
upgrades required. These upgrades consider future demand and account for those as part of the
upgrade. For the purposes of this asset management plan meeting the existing levels of service is
the basis for this plan, and therefore these upgrades are included within the 10 year financial
window.
GCWS Reticulation Pipework: Capacity & Criticality
The pipeline has additional capacity should additional pumping be placed on the main; however this
will require pumping at the Te Arai Bush intake to prevent water from the Damline exiting through
that intake.
GCWS Reticulation Pipework: Life
Material
Typical Failure Mode
Estimated Average Service
Life (years)
CI (Cast Iron) Flow restriction due to tuberculation.
Failure of lead joints. 100
Steel (Concrete lined) External Corrosion due to reaction with some soils.
Internal abrasion. 100
Concrete Pipe Weakening of pipe wall.
Failure of joints. 60
AC (Asbestos Cement) Softening of pipe wall.
Splits/cracks due to ground movement. 60
GI (Galvanised Iron) External corrosion due to reaction with some soils.
Flow restriction due to tuberculation. 50
up Fractures due to pressure fluctuations.
Solvent joints with shear movement. 90
HDPE (High density polyethylene) Poor installation. 100
LDPE (Low density polyethylene) Failure of joints.
Fatigue. 30
Spiral Welded Steel (Concrete
lined) Poor welds. Damaged protective coatings. 100
Ductile Iron Damaged protective coatings. 100
Copper Corrosion due to reaction with soils and corrosive
water. 80
Figure 1- Typical Pipe Failure and Estimated Average Service Life
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AC Pipe – Data on life expectancies do vary with diameter of pipe. This is due a number of factors
that have been assessed on a national level. In 2001 New Zealand Water and Waste Association
compiled an Asbestos Cement Water Main manual. Life expectancies of varying pipe sizes are
summarised below. These ages are pressure dependant, a working pressure of 600kPa has been
assumed.
AC pipe diameter (mm) Class National Average Life Expectancy (Years) Gisborne City Life Expectancy (Years)
50 E/F 38 40
80 C 42 44
100 C 51 54
150 C 59 62
200 C 67 70
250 C 76 80
300 C 90 95
375 C 111 117
CI main not identified for epoxy lining have had life extension condition factors applied. These factors
have been calculated to increase the pipe life (to be outside the 20y window or +20y).
Te Karaka Water Supply (TKWS)
TKWS Treatment: Condition
Treatment Station Water quality is far better than that contained in the consumer‟s rainwater tank. Unfortunately the
NZDWS do not recognise this and require a higher standard that is greatly diminished when
discharged in the tanks. These issues have yet to be resolved with the Chief Medical Health Officer
on the quality that Council will supply to a top up rain water system. If the full TAP & CAP application
is successful, than the water quality should improve immensely. Also, the supply will change to a full
mains water supply system taking out the risk of contamination via the rainwater tanks. This
application is due by November 2008.
Supply Pump Stations This pump station is of metal and concrete construction and has a submersible pump. The condition
of the pump station is moderate. The housing shed is sound and has had recently been replaced.
This work has been carried out in 2007 including strengthening the base of the walls and door of the
pump station. The door periodically is vandalised as attempts to break in occur.
The pump is new in 2005 and is in very good condition.
The well is inspected annually as the bore pump is removed. The condition of this bore has
deteriorated with the high mineral content in the water however it remains good.
TKWS Treatment: Performance
Treatment Station The supply is provided from a bore on the outer stop bank of the Waipaoa River and is pumped from
the bore into a pressure tank, and fed directly to the town. This has subsequently been upgraded
and a Cumary filter has been added, which introduces oxygen into the water supply to assist in iron,
and manganese removal, which is taken out as part of the filtration process. This is then chlorinated
and pumped through pressure tanks to the consumer.
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The system operates on pressure differentials to ensure flows to the reticulation system are suitable.
The interrelationship of the treatment components is critical so a treatment system operation
manual has been developed to aid the capture of corporate knowledge.
Supply Pump Stations The performance of this pump station is unusual. The bore pump operates not only as a supply
pump but also in a pressure pump capacity. It has a high number of up to 30 starts per hour. The
performance of this pump station requires review with funding in Central governments Technical
Assistance Programme (TAP) being considered as a funding source for this work.
In theory this pump station should only operate in summer where water sourced from the domestic
roof is insufficient to meet the domestic demand. This has not been realised as a result of issues
within the reticulation.
TKWS Treatment: Capacity and Criticality
Treatment Station Few complaints are received on the performance of the system. When complaints have been
received investigations have shown that a number of consumers are not complying with the
conditions of the supply. This is a result of not maintaining their own roof water system to ensure
that the Council supply only acts as a supplementary supply and not their main source of water.
Supply Pump Stations The current pump station operates satisfactorily to deliver water to residents. The pump station is
critical as the system has no storage other than individual‟s tanks and if the pump station fails the
system can not operate to supply water.
In some cases non compliance still remains unresolved and will not be pursued until the water
quality issues have been resolved with the Chief Medical Health Officer on the quality that Council
will supply to a top up rain water system.
The capacity and performance of the system consequently at times appears not to meet the 1000
litres of water per property per day. On investigation it would appear in fact that the water quantity is
met and is more a reflection of consumer expectation to a higher level of service than that for which
the system was originally designed. Given that the reducing population, the move to a higher rental
status of properties, it is unlikely that the rate payers would be prepared to fund any capacity
increases to a higher level of service, and focus will be more on internal management of their own
systems. Further meetings on levels of service will need to be held with the consumers following the
enforcement of new drinking water standards following the Health (Drinking Water) Amendment Act
2007.
TKWS Treatment: Life
Treatment Station The treatment system has 9 years remaining life. This has been estimated from the installation date
and the original design life being 35 years.
Replacement will be funded depending on the success of the TAP & CAP application.
Supply Pump Stations The pump station has 9 years remaining life. This has been estimated from the installation date and
the original design life being 35 years.
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TKWS Reticulation: Condition
The reticulation system was constructed of low density polyethylene (LDPE) with mechanical
couplers and it is anticipated that the economic life for this reticulation is 35 years which leaves a
figure for remaining life of 9 years. PVC is also present in the Te Karaka reticulation and the
economic life for this is 80 years which leaves a figure for remaining life of 54 years. With the
introduction of the filtered water system and high level removal of iron and manganese these
residue deposits which exist within the reticulation are being removed as part of on going
maintenance and believed will ensure that the economic life for this system can be achieved. Leak
detection work is also on going to identify any leaks which we believe would substantially diminish
the capacity of the reticulation, but to date no identifiable leaks have been found. This work will be
on going.
Reticulation Components
As part of the specification for these components, considerable effort has focused on both internal
and external corrosion issues, and Council has used high quality, high efficient components, and
included several levels of corrosion mitigation and even considers the construction of the
components with respect to electrical potential, longevity of the coating systems, their scratch
resistant nature and the requirement to provide additional protective wrapping on the external areas
of those components.
The poor water quality of the source water does cause significant build up of iron deposits on the
reticulation.
TKWS Reticulation: Performance
While an increasing number of people are questioning the performance of the top up water supply,
they remain a small percentage. Investigations have shown that a number of consumers are not
complying with the conditions of supply, nor maintaining their own roof water system to ensure that
the Council supply only acts as a supplementary supply and not their main source of water.
Investigations have clearly shown a high level of abuse and non-compliance has been on going.
The performance is largely dependant on private users. Water from the pump station travel through
the reticulation to the toby which has a restrictor in it onto the property through a ballcock system
and into the private storage tank.
Conditions of supply are;
The supply is supplementary, a primary source still needs to be provided (typically rainwater)
There needs to be a restrictor of 1m³/day in place (in reality this is a 1.5m³ as the low
pressure reduces supply further)
A ballcock 600mm off the bottom of a 25000 lt tank so that flow is received only when tank
volumes are low
A summary of inspections conducted in 2006 indicated that individual property owner had modified
68% of the connections, but after 2007 inspections, that number was down to 41%. Modification
included restrictor removed, ballcocks removed, illegal connections and no primary water source. In
some case the water supply was simply overflowing the water tanks to ground.
Due to these problems water flows to some individuals are limited as effectively the system has
continuously flowing leaks.
Letters of notification to rectify these problems have been issued however repeated inspection will
need to be required to ensure individual connections comply.
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Flow rates have also been observed by residents to decline over the last 5 years. This is possibly due
to tuberculation occurring from high iron and manganese levels in the reticulated water or the
installation of new restrictor units. These were replaced due to tampering and a worn orifice.
TKWS Reticulation: Capacity and Criticality
The current system will meet the required demands for the foreseeable future.
TKWS Reticulation: Life
Material
Typical Failure Mode
Estimated Average
Service Life (years)
PVC Fractures due to pressure fluctuations.
Solvent joints with shear movement.
80
LDPE Failure of joints. Fatigue. 35
Whatatutu Water Supply (WTWS)
WTWS Treatment: Condition
Treatment Station Water quality is far better than that contained in the consumer‟s rainwater tank. Unfortunately the
NZDWS do not recognise this and require a higher standard that is greatly diminished when
discharged in the tanks. These issues have yet to be resolved with the Chief Medical Health Officer
on the quality that Council will supply to a top up rain water system. If the full TAP & CAP application
is successful, than the water quality should improve immensely. Also, the supply will change to a full
mains water supply system taking out the risk of contamination via the rainwater tanks. This
application is due by November 2008.
Supply Pump Stations This pump station is of metal and concrete construction and has a submersible pump. The condition
of the pump station is moderate. The housing shed is sound and has had repairs as required. The
door periodically is vandalised as attempts to break in occur.
The pump is new in 2005 and is in very good condition.
The well is inspected annually as the bore pump is removed. The condition of this bore has
deteriorated with the high mineral content in the water however it remains good.
WTWS Treatment: Performance
Treatment Station
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Water treatment consists of a Cumary filter, which introduces oxygen into the water supply to assist
in iron, and manganese removal, which is taken out as part of the filtration process. Water is then
chlorinated.
The system operates on pressure differentials to ensure flows to the reticulation system are suitable.
The interrelationship of the treatment components is critical and not well understood due to a lack of
familiarity. A treatment system operation manual has been developed to aid the capture of corporate
knowledge.
Given that the reducing population, the move to a higher rental status of properties, it is unlikely that
the ratepayers would be prepared to fund any capacity or quality increases. Focus will be more on
internal management of their own systems. Further meetings on levels of service will need to be held
with the consumers following the enforcement of new drinking water standards following the Health
(Drinking Water) Amendment Act 2007 and results of submitting the Whatatutu Water Supply
PHRMP for the CAP application.
Supply Pump Stations The performance of this pump station is unusual. The bore pump operates not only as a supply
pump but also in a pressure pump capacity. It has a high number of up to 30 starts per hour. The
performance of this pump station requires review with funding in Central governments Technical
Assistance Programme (TAP) being considered as a funding source for this work.
In theory this pump station should only operate in summer where water sourced from the domestic
roof is insufficient to meet the domestic demand. This has not been realised as a result of issues
within the reticulation.
WTWS Treatment: Capacity and Criticality
Treatment Station Few complaints are received on the performance of the system. When complaints have been
received investigations have shown that a number of consumers are not complying with the
conditions of the supply. This is a result of not maintaining their own roof water system to ensure
that the Council supply only acts as a supplementary supply and not their main source of water.
Supply Pump Stations The current pump station operates satisfactorily to deliver water to residents. The pump station is
critical as the system has no storage other than individual‟s tanks and if the pump station fails the
system can not operate to supply water.
WTWS Treatment: Life
Treatment Station The treatment system has 7 years remaining life. This has been estimated from the installation date
and the original design life being 35 years. Replacement will be funded depending on the success of
the TAP & CAP application.
Supply Pump Stations The pump station has 7 years remaining life. This has been estimated from the installation date and
the original design life being 35 years.
Activity Management Plan Gisborne District Council
n-49637 Page 111
WTWS Reticulation: Condition
The reticulation system was constructed of low density polyethylene (LDPE) with mechanical
couplers and it is anticipated that the economic life for this reticulation is 35 years which leaves a
figure for remaining life of 7 years. PVC and GALV are also present in the Whatatutu reticulation and
the economic lives for these are 80 years and 35 years respectively which leaves a figure for
remaining life of 54 years and 7 years respectively. With the introduction of the filtered water system
and high level removal of iron and manganese these residue deposits which exist within the
reticulation are being removed as part of on going maintenance and believed will ensure that the
economic life for this system can be achieved. Leak detection work is also on going to identify any
leaks which we believe would substantially diminish the capacity of the reticulation, but to date no
identifiable leaks have been found. This work will be on going.
The condition of the reticulation reflects its age. No sampled condition assessment has occurred on
this network. Most failures are difficult to pick up due to the low pressure system operating. As part
of the renewal programme the system will be condition rated and tested for leakage.
Reticulation Components As part of the specification for these components, considerable effort has focused on both internal
and external corrosion issues, and Council has used high quality, high efficient components, and
included several levels of corrosion mitigation and even considers the construction of the
components with respect to electrical potential, longevity of the coating systems, their scratch
resistant nature and the requirement to provide additional protective wrapping on the external areas
of those components.
The poor water quality of the source water does cause significant build up of iron deposits on the
reticulation.
WTWS Reticulation: Performance
The performance is largely dependant on private users. Water from the pump station travels through
the reticulation to the toby which has a restrictor in it onto the property through a ballcock system
and into the private storage tank.
Conditions of supply are;
The supply is supplementary; a primary source still needs to be provided (typically
rainwater)
There needs to be a restrictor of 1m³/day in place (in reality this is a 1.5m³ as the low
pressure reduces supply further)
A ballcock 600mm off the bottom of a 25000 lt tank so that flow is received only when
tank volumes are low
A 2007 survey indicated that individual property owner had modified 43% of the connections.
Modification included restrictor removed, ballcocks removed, illegal connections and no primary
water source. In some case the water supply was simply overflowing the water tanks to ground.
Due to these problems water flows to some individuals are limited as effectively the system has
continuously flowing leaks.
Letters of notification to rectify these problems have been issued however repeated inspection will
needs to be required to ensure individual connections comply.
Activity Management Plan Gisborne District Council
n-49637 Page 112
WTWS Reticulation: Capacity and Criticality
The current system will meet the required demands for the foreseeable future.
WTWS Reticulation: Life
Material
Typical Failure Mode
Estimated Average
Service Life (years)
GI (Galvanised Iron) External corrosion. Flow restriction due to tuberculation. 35
PVC Fractures due to pressure fluctuations. Solvent joints with
shear movement. 80
LDPE Failure of joints. Fatigue. 35
Figure 2- Typical Pipe Failure and Estimated Average Service Life
Activity Management Plan Gisborne District Council
n-49637 Page 113
Appendix C – Financial Information
2009-2019 - Capex Schedules
Total
2008-09
2009-10
2010-11
2011-12
2012-13
2013-14
2014-15
2015-16
2016-17
2017-18
2018-19
Justification sheet
PHRMP Ref.
PHRMP Priority DETAILS
Project
Cost
Annua
l Plan
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year
9
Year 10
DWSNZ:2005 Compliance Projects
CX1
Waingake TP: Baffles in CWR
$ 80,0
00
$ 80,000
$ -
$ -
CX2
Waingake TP: UVT installation (In previous LTCCP)
$ 65,0
00
$ 400,00
0
$ 65,0
00
CX3
Waipaoa TP: UVT installation (In previous LTCCP)
$ 145,000
$ 90,000
$ 145,000
CX4 B
Extreme
Distribution: Hospital Hill Cl2 circ. Improvements
$ 115,000
$ 25,000
$ 90,0
00
CX5
Rural Townships: Te Karaka WS upgrades
$ 250,000
$ 250,00
0
CX6
Rural Townships: Whatatutu WS upgrades
$ 250,000
$ 250,00
0
Demand Management Planning Projects
CX7
Distribution: Additional meters and valves for efective Demand management investigation
$ 36,6
00
$ 36,6
00
CX8
Distribution: Universal Metering
$ 4,000,00
0
$ 100,000
$ 1,900,000
$ 2,000,000
CX9
Waingake Catchment: Williams dam storage increase
$ 1,026,19
8
$ 40,0
00
$ 986,198
Strategic Asset Management Projects
CX10 U
Medium
Waingake Catchment: Clapcott supply main replacement
$ 729,280
$ 100,000
$ 629,280
Fire Fighting Compliance: SNZ PAS 4509:2008 Projects
CX11
Distribution: Fire-fighting upgrade (In previous
$ 481,280
$69,88
0
$ 69,880
$ 411,400
Activity Management Plan Gisborne District Council
n-49637 Page 114
2009-2019 - Capex Schedules
Total
2008-09
2009-10
2010-11
2011-12
2012-13
2013-14
2014-15
2015-16
2016-17
2017-18
2018-19
Justification sheet
PHRMP Ref.
PHRMP Priority DETAILS
Project
Cost
Annua
l Plan
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year
9
Year 10
LTCCP) c/o into 201
1-12
CX12
Bulk Distibution: Western industrial Ring Main (In previous LTCCP)
$ 1,074,18
2
$369,080 c/o
into 200
9-10
$ 1,074,18
2
Operational Asset Management Projects
CX13 P
High
Distribution: Telemetry for Gaddums Hill & Hauroa Rd reservoirs
$ 33,3
80
$ 33,380
CX14
AA
Low
Waingake TP: Filter to waste facility
$ 126,460
$ 126,460
CX15 Y
Low
Waingake TP: Flow switches for Chemical dosing.
$ 39,5
90
$ 39,590
CX16 Z
Low
Waipaoa TP: Install streaming current meter
$ 47,5
60
$ 47,560
CX17
Waingake TP: Backwash Discharge Treatment issues
$ 20,0
00
$ 20,0
00
Emergency Response Planning Projects
CX18 J
High
Waingake TP: Seismic restraints for chemical bulk storage tanks
$ 53,6
15
$ 53,615
CX19 L
High
Waipaoa TP: Seismic restraints for chemical bulk storage tanks
$ 53,6
15
$ 53,615
Asset Renewal Projects
CX20
Distribution: Pipe Renewals [Asbestos main replacement (In previous LTCCP)]
$ 1,623,72
5
$ 52,500
$ 20,9
00
$ 39,100
$ 74,2
21
$ 82,6
57
$ 25,760
$ 43,1
48
$ 550,000
$ 310,000
$ 477,939
CX21
Waingake Catchment: Renew Power Poles (In previous LTCCP)
$ 125,000
$26,87
5 c/o
into 200
9-
$ 125,000
Activity Management Plan Gisborne District Council
n-49637 Page 115
2009-2019 - Capex Schedules
Total
2008-09
2009-10
2010-11
2011-12
2012-13
2013-14
2014-15
2015-16
2016-17
2017-18
2018-19
Justification sheet
PHRMP Ref.
PHRMP Priority DETAILS
Project
Cost
Annua
l Plan
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year
9
Year 10
10
CX22
Distribution: Water Meter Renewals
$ 500,000
$ 50,000
$ 50,000
$ 50,000
$ 50,000
$ 50,000
$ 50,000
$ 50,000
$ 50,000
$ 50,000
$ 50,000
CX23
Waingake TP: Plant road re-seal renewal
$ 60,0
00
$ 60,000
Development Contributions Projects
CX24
Development Contributions:Taruheru block water (In previous LTCCP)
$ 1,018,87
5
$ 92,625
$ 92,6
25
$ 92,625
$ 92,625
$ 370,500
$ 370,500
CX25
Development Contributions: Construct Knob Hill Booster Station & Reservoir Supply Main
$ 1,300,00
0
$ 100,00
0
$ 600,000
$ 600,000
CX26
Development Contributions: Local Urban Upgrades
$ 250,000
$ 25,0
00
$ 25,000
$ 25,000
$ 25,000
$ 25,0
00
$ 25,000
$ 25,0
00 $ 25,000
$ 25,000
$ 25,000
Total Cost
$ 13,504,3
60
$ 1,714,30
7
$ 451,00
5
$ 758,83
5
$ 1,767,58
1
$ 757,657
$ 200,76
0
$ 1,157,92
8
$ 1,771,19
8
$ 2,285,00
0
$ 2,640,08
9
2009-2019 OPEX Schedules
Total
2008-09
2009-10
2010-11
2011-12
2012-13
2013-14
2014-15
2015-16
2016-17
2017-18
2018-19
OPEX ID
PHRMP Ref.
PHRMP Priority DETAILS
Project
Cost
Annual
Plan
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year 9
Year 10
DWSNZ:2005 Compliance Projects
OPX 1
BB Extreme
Distribution: Procedure for bulk addition of chemicals into city reservoirs
$ 5,000
$ 5,00
0
OPX 2
not identified
Rural Townships: Whatatutu Water Supply Improvements: Design and
$ 20,00
0
$ 20,0
00
Activity Management Plan Gisborne District Council
n-49637 Page 116
2009-2019 OPEX Schedules
Total
2008-09
2009-10
2010-11
2011-12
2012-13
2013-14
2014-15
2015-16
2016-17
2017-18
2018-19
OPEX ID
PHRMP Ref.
PHRMP Priority DETAILS
Project
Cost
Annual
Plan
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year 9
Year 10
Supervision (subject to CAP funding)
OPX 3
not identified
Rural Townships: Te Karaka Water Supply Improvements: Design and Supervision (subject to CAP funding)
$ 20,00
0
$ 20,0
00
$ -
Asset Maintenance Projects
OPX 4
not identified
Bulk Distribution: Recondition of Makaraka Pumps
$ 13,50
0
$ 13,5
00
OPX 5
not identified
Bulk Distribution: Te Arai Pipe Bridge repairs
$ 73,50
0
$ 73,500
OPX 6
not identified
Distribution: Hospital Hill waveband (Design & Built, 5year priority)
$ 100,0
00
$ 10,0
00
$ 90,000
OPX 7
not identified
Distribution: Hospital Hill reservoir sealing (2 year priority )
$ 171,5
00
$ 50,000
$ 53,500
$ 68,000
OPX 8
not identified
Distribution: Knob Hill reservoir sealing (2 year & 10 year Priority)
$ 133,0
00
$ 98,000
$ 35,000
OPX 9
not identified
Waingake Catchment: Clapcott dam lining
$ 30,57
0
$ 30,570
$ -
OPX 10
not identified
Waingake Catchment: Williams dam sealing and spillway repairs
$ 82,04
0
$ 82,040
OPX 11
D
High
Waipaoa TP: Bird scaring mechanism at sed ponds
$ 6,860
$ 6,86
0
OPX 12
T
High
Waipaoa TP: Protection of Tanker Filling Point
$ 5,150
$ 5,15
0
OPX 13
Connect intake pump station to emergency generator supply
$ 15,00
0
$ 15,0
00
Demand Management Planning Projects
OPX 14
not identified
Distribution: Levelling of City reservoirs
$ 10,00
0
$ 10,0
00
OPX 15
DS High
Distribution: Water Model Calibration
$ 50,00
0
$ 50,0
00
Activity Management Plan Gisborne District Council
n-49637 Page 117
2009-2019 OPEX Schedules
Total
2008-09
2009-10
2010-11
2011-12
2012-13
2013-14
2014-15
2015-16
2016-17
2017-18
2018-19
OPEX ID
PHRMP Ref.
PHRMP Priority DETAILS
Project
Cost
Annual
Plan
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year 9
Year 10
OPX 16
not identified
Water Utility: Establish Demand Management Plan
$ 50,00
0
$ 50,0
00
OPX 17
FQ Medium
Water Utility: Draught Management Plan
$ 20,00
0
$ 20,0
00
OPX 18
DQ High
Bulk Distribution: Model scenarios & Field work to improve operation of Makaraka Booster station
$ 20,00
0
$ 20,0
00
Strategic Asset Management Projects
$ -
OPX 19
not identified
Water Utility: Sanitary Assessment
$ 20,00
0
$ 20,0
00
OPX 20
CZ High
Water Utility: Asset Componentry: Overall Strategy
$ 10,00
0
$ 10,0
00
OPX 21
CZ High
Water Utility: Asset Componentry Condition Assessment & Renewals Program. 1 FTE for 24months
$ 75,00
0
$ 75,000
OPX 22
not identified
Waingake Catchment: Pipe bridges condition assessments
$ 20,00
0
$ 20,0
00
OPX 23
EU High
Distribution: Criticality Analysis of Reticulation network
$ 15,00
0
$ 15,0
00
OPX 24
not identified
Waingake Catchment: Hydro Electric Feasibility Study (25% of $28k)
$ 7,000
$ 7,00
0
Fire Fighting Compliance: SNZ PAS 4509:2008 Projects
$ -
OPX 25
GD Medium
Distribution: NZFS flow capability assessment (utilising Water Model)
$ 50,00
0
$ 50,0
00
Operational Asset Management Projects
$ -
OPX 26
GQ Low Bulk Distribution: Establish scouring procedure for bulk main in light of first customer non compliance
$ 7,000
$ 7,000
Emergency Response Planning Projects
$ -
OPX 27
BM High
Water Utility: Emergency Response Plan
$ 30,00
0
$ 30,000
Activity Management Plan Gisborne District Council
n-49637 Page 118
2009-2019 OPEX Schedules
Total
2008-09
2009-10
2010-11
2011-12
2012-13
2013-14
2014-15
2015-16
2016-17
2017-18
2018-19
OPEX ID
PHRMP Ref.
PHRMP Priority DETAILS
Project
Cost
Annual
Plan
Year 1
Year 2
Year 3
Year 4
Year 5
Year 6
Year 7
Year 8
Year 9
Year 10
Water Quality Projects (predominantely referring to climate change)
$ -
OPX 28
BL High
Waingake Catchment: Algae Management Plan
$ 20,00
0
$ 20,0
00
OPX 29
FS Medium
Waipaoa Catchment: Review Intake screens performance
$ 9,000
$ 9,000
OPX 30
FW Medium
Waingake Catchment: Develop programme for silt monitoring
$ 8,000
$ 8,000
OPX 31
BG High
Waipaoa Catchment: Sanitary Survey
$ 10,00
0
$ 10,0
00
OPX 32
C
High
Waingake Catchment: Flushing of intake screen if sedimantation occurs
$ 7,000
$ 7,00
0
Asset Renewal Projects
$ -
OPX 33
not identified
Pipe Condition Assessment Project
$ 100,0
00
$ 10,0
00
$ 10,0
00
$ 10,0
00
$ 10,0
00
$ 10,0
00
$ 10,000
$ 10,000
$ 10,000
$ 10,000
$ 10,000
OPX 34
not identified
Pipe Renewals Programming Project
$ 15,00
0
$ 5,00
0
$ 5,000
$ 5,000
OPX 35
not identified
Develop Activity Management Plan
$ 45,00
0
$ 15,0
00
$ 15,000
$ 15,000
$ 1,274,120
$ -
$ 302,540
$ 442,580
$ 145,000
$ 120,000
$ 115,000
$ 39,000
$ 18,000
$ 17,000
$ 30,000
$ 45,000
Activity Management Plan Gisborne District Council
n-49637 Page 119
Summary of Forecasted Financial Performance for the Ten Years 2010 to 2019 2010
$'000
2011
$'000
2012
$'000
2013
$'000
2014
$'000
2015
$'000
2016
$'000
2017
$'000
2018
$'000
2019
$'000
WATER SUPPLY
Operations
Operating revenue
Activity revenue -
1,515
-
1,560
-
1,604
-
1,647
-
1,701
-1,751 -
1,812
-
1,868
-
1,928
-
1,992
Grants & subsidies 0 0 0 0 0 0 0 0 0 0
Other revenue 0 0 0 0 0 0 0 0 0 0
Total operating revenue -
1,515
-
1,560
-
1,604
-
1,647
-
1,701
-1,751 -
1,812
-
1,868
-
1,928
-
1,992
Operating expenditure
Depreciation 1,887 1,947 2,002 2,059 2,129 2,192 2,275 2,349 2,427 2,572
Interest 82 84 89 98 97 96 95 92 156 289
Operating costs 2,749 3,084 3,027 3,053 3,140 3,072 3,240 3,348 3,367 3,596
Total operating expenditure 4,718 5,115 5,118 5,210 5,366 5,360 5,610 5,789 5,950 6,457
Net internal charges/recoveries) 137 153 178 225 243 255 297 341 444 507
Net cost of service 3,340 3,708 3,692 3,788 3,908 3,864 4,095 4,262 4,466 4,972
Funded by:
Rates income -
3,340
-
3,708
-
3,692
-
3,788
-
3,908
-3,864 -
4,095
-
4,262
-
4,466
-
4,972
Transfers to/from reserves 0 0 0 0 0 0 0 0 0 0
Depreciation not funded 0 0 0 0 0 0 0 0 0 0
(Increase)/decrease in deficits carried
forward
0 0 0 0 0 0 0 0 0 0
Total operations funding -
3,340
-
3,708
-
3,692
-
3,788
-
3,908
-3,864 -
4,095
-
4,262
-
4,466
-
4,972
Capital
Capital outgoings
Asset purchases - Growth 26 27 37 203 180 616 429 58 555 1,025
Asset purchases - Increase level of service 150 0 155 0 0 0 0 0 0 0
Asset purchases - Maintain level of service 241 356 529 1,288 696 1,013 156 830 2,308 2,728
Total asset purchases 417 383 721 1,492 875 1,630 584 887 2,863 3,754
Loan repayments 78 86 89 101 111 112 120 122 127 226
Total capital outgoings 495 469 810 1593 986 1742 704 1009 2990 3980
Funded by:
Rates income 0 0 0 0 0 0 0 0 0 0
Development contribution income -219 -219 -219 -137 -137 -137 -137 -137 -129 -129
Transfers to/from development contribution
reserve
175 193 190 8 6 -406 -287 86 -307 -763
Capital grants & donations 0 -254 -260 0 0 0 0 0 0 0
Other capital revenue 0 0 0 0 0 0 0 0 0 0
Loan funding -169 -49 -255 -195 -12 -160 -49 -102 -
1,976
-
2,184
Transfer from depreciation reserve -281 -140 -267 -1,270 -843 -1,040 -231 -856 -578 -904
Transfer to/from other reserves -1 0 1 1 0 1 0 0 0 0
Total capital funding -495 -469 -810 -1593 -986 -1742 -704 -1009 -2990 -3980
\
Activity Management Plan Gisborne District Council
n-49637 Page 120
Total Capital Projects
0
1,000
2,000
3,000
4,000
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
$000
Asset purchases - Growth Asset purchases - Increase level of serviceAsset purchases - Maintain level of service
Depreciation v Renewal Capital Projects
0
500
1000
1500
2000
2500
3000
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
$000
Renewal Cost Depreciation
Activity Management Plan Gisborne District Council
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Summary Operational Project Report – Current Projects 2009-2019 LTCCP
Priority Project LOS Description Total Cost 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Water Supply Operational
PRIMARY_D 530049 MAINT
100
Strategic Asset Management Projects
- Analysis of Reticulation Network 15,000 15,000
SECF_50-54 530036 MAINT
100
Asset Maintenance Projects -
Williams Dam Sealing 82,040 82,040
SECF_50-54 530038 INC
100
Asset Maintenance Projects -
Waipaoa Protection of Tanker Filling
Point
5,150 5,150
SECF_50-54 530052 INC
100
Operational Asset Management -
Scouring Procedure 7,000 7,000
SECF_50-54 530054 MAINT
100
Water Quality Projects - Waingake
Algae Management Plan 20,000 20,000
SECF_55-59 530030 MAINT
100
Asset Maintenance Projects -
Recondition of Makaraka Pumps 13,500 13,500
SECF_55-59 530032 INC
100
Asset Maintenance Projects - Hospital
Hill Waveband 100,000 10,000 90,000
SECF_55-59 530033 MAINT
100
Asset Maintenance Projects - Hospital
Hill Sealing 171,000 53,000 50,000 68,000
SECF_55-59 530034 MAINT
100
Asset Maintenance Projects - Knob
Hill Reservoir Sealing 133,000 98,000 35,000
SECF_55-59 530035 MAINT
100
Asset Maintenance Projects -
Clapcott Dam Lining 30,570 30,570
SECF_55-59 530040 INC
100
Demand Management Planning
Projects - Levelling City Reservoirs 10,000 10,000
SECF_55-59 530041 INC
100
Demand Management Planning
Projects - Water Model Callibration 50,000 50,000
SECF_55-59 530042 MAINT
100
Demand Management Planning
Projects - Establish Demand
Management Plan
50,000 50,000
SECF_55-59 530043 INC
100
Demand Management Planning
Projects - Water Utility Draught
Management Plan
20,000 20,000
Activity Management Plan Gisborne District Council
n-49637 Page 122
Priority Project LOS Description Total Cost 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Water Supply Operational
SECF_55-59 530044 INC
100
Demand Management Planning
Projects - Makaraka Booster Station
Improvements
20,000 20,000
SECF_55-59 530046 INC
100
Strategic Asset Management Projects
- Water Utility Asset Componentry 10,000 10,000
SECF_55-59 530048 MAINT
100
Strategic Asset Management Projects
- Waingake Pipe Bridges
Assessments
20,000 20,000
SECF_55-59 530058 MAINT
100
Water Quality Projects - Intake Screen
Flushing 7,500 7,500
SECF_55-59 530059 MAINT
100
Asset Renewals Projects - Pipe
Condition Assessment 100,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000
SECF_55-59 530060 MAINT
100
Asset Renewals Projects - Pipe
Renewals Programming 15,000 5,000 5,000 5,000
SECF_55-59 530061 MAINT
100
Asset Renewals Projects - Develop
Activity Management Plan 45,000 15,000 15,000 15,000
SECF_60-64 530028 MAINT
100
DWSNZ:2005 Compliance Projects -
Whatatutu Supply Improvements 20,000 20,000
SECF_60-64 530029 MAINT
100
DWSNZ:2005 Compliance Projects -
Te Karaka Supply Improvements 20,000 20,000
SECF_60-64 530031 INC
100
Asset Maintenance Projects - Te Arai
Pipe Repairs 73,500 73,500
SECF_60-64 530039 INC
100
Asset Maintenance Projects - Pump
Station Emergency Connection 15,000 15,000
SECF_60-64 530047 INC
100
Strategic Asset Management Projects
- Water Utility Assessment &
Renewals Program
75,000 75,000
SECF_60-64 530051 MAINT
100
Fire Fighting Compliance SNZ PAS
4509:2008 - NZFS Flow Assessment 50,000 50,000
SECF_60-64 530053 MAINT
100
Emergency Response Planning
Projects - Water Utility 30,000 30,000
Activity Management Plan Gisborne District Council
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Priority Project LOS Description Total Cost 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Water Supply Operational
SECF_65-69 530027 MAINT
100
DWSNZ:2005 Compliance Projects -
Chemicals into City Reservoirs
Procedure
5,000 5,000
SECF_65-69 530045 MAINT
100
Strategic Asset Management Projects
- Water Utility Sanitary Assessment 20,000 20,000
Totals: 1,233,260 225,540 344,650 285,570 120,000 105,500 50,000 10,000 17,000 30,000 45,000
Grand Total: 1,233,260 225,540 344,650 285,570 120,000 105,500 50,000 10,000 17,000 30,000 45,000
Activity Management Plan Gisborne District Council
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Summary Operational Project Report – Discontinued Projects 2009-2019 LTCCP
Priority Project LOS Description Total
Cost 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Water Supply Operational
SECF_50-54 530055
Subreports
within
table/matrix
cells are
ignored.
Water Quality Projects - Waipaoa
Intake Screens Review
SECF_50-54 530056
Subreports
within
table/matrix
cells are
ignored.
Water Quality Projects - Waingake
Silt Monitoring Programme
SECF_55-59 530057
Subreports
within
table/matrix
cells are
ignored.
Water Quality Projects - Waipaoa
Sanitary Survey
SECF_60-64 530037
Subreports
within
table/matrix
cells are
ignored.
Asset Maintenance Projects -
Establishment of Safe Communities 6,860 6,860
SECF_60-64 530050
Subreports
within
table/matrix
cells are
ignored.
Strategic Asset Management
Projects - Waingake Hydro Electric
Feasibility
Totals: 6,860 6,860
Grand Total: 6,860 6,860
Activity Management Plan Gisborne District Council
n-49637 Page 125
Summary Project Report - Discontinued Projects 2009-2019 LTCCP
Priority Project LOS Description Total Cost 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Water Supply
SECF_55-59 530007
INC
50
MAINT
50
Waingake Catchment : Williams dam
storage increase 1,254,949 47,840 1,207,109
SECF_55-59 530008 MAINT
100
Waingake Catchment : Clapcott
supply main replacement 869,519 116,900 752,619
SECF_55-59 530013 MAINT
100
Waingake Treatment Plant : Flow
switches for Chemical Dosing 50,834 50,834
SECF_55-59 530014 MAINT
100
Waingake Treatment Plant : Install
streaming current meter 61,067 61,067
SECF_55-59 530021 MAINT
100
Waingake Treatment Plant : Plant
road re-seal renewal 73,440 73,440
Totals: 2,309,809 116,900 800,459 1,280,549 111,901
Grand Total: 2,309,809 116,900 800,459 1,280,549 111,901
Activity Management Plan Gisborne District Council
n-49637 Page 126
Appendix D – Risk Management Approach
Risk Assessments and Risk Management Reports
a. Stormwater
i. Stormwater Reticulation
b. Sewerage
i. Sewerage Reticulation
ii. Sewerage Treatment and Disposal
iii. Human Health Risk Assessment for the Gisborne city Wastewater Outfall
c. Water
i. Water Supply Pipeline
ii. Dams and Storage Reservoirs
iii. Public Health Risk Management Plan
1. Gisborne Water Supply PHRMP (Draft)
2. Te Karaka Water Supply PHRMP (Draft)
3. Whatatutu Water Supply PHRMP (Draft)
iv. Volcano-hydrologic hazards in the Waipaoa catchment.
v. GDC Emergency Management Response Plan for Bulk Water Pipeline
Failure (Draft)
d. Other
i. Plant and Motor Vehicles
ii. Staff and Industrial Relations
iii. Gisborne District Civil Defence and Emergency Services Volcanic
Contingency Plan
iv. GDC Utilities (Water & Waste) Emergency Management Plan (Draft)
Report Details
1.a.i GDC Risk Management - Stormwater Reticulation Author: Tim Crook, 19 May 1998
This report contains all the information in relation to Stormwater Reticulation that is
necessary for the executive management to determine what action, if any, should be taken in
respect of the risks and to provide information to personnel responsible for the subject matter at a
day to day or routine management level. They will also be used by the Risk Manager to monitor the
system and ensure its efficacy as far as circumstances permit. Sections include: Introduction, Scope
of Risk Assessment, Counter Measures, Question & Response Listing and Counter Measure
Triggers.
Note: See DOCS_n61277_v1_AMP_Risk_Management_Summary_-
_Counter_Measures_for_all_Utilities.xls for project recommendations.
1.b.i GDC Risk Management - Sewerage Reticulation Author: Tim Crook, 16 July 1998
This report contains all the information in relation to Sewerage Reticulation that is
necessary for the executive management to determine what action, if any, should be taken in
respect of the risks and to provide information to personnel responsible for the subject matter at a
day to day or routine management level. They will also be used by the Risk Manager to monitor the
system and ensure its efficacy as far as circumstances permit. Sections include: Introduction, Scope
of Risk Assessment, Counter Measures, Question & Response Listing and Counter Measure
Triggers.
Note: See DOCS_n61277_v1_AMP_Risk_Management_Summary_-
_Counter_Measures_for_all_Utilities.xls for project recommendations.
1.b.ii GDC Risk Management - Sewerage Treatment & Disposal Author: Tim Crook, 16 Dec 1998
This report contains all the information in relation to Sewerage Treatment & Disposal that
is necessary for the executive management to determine what action, if any, should be taken in
respect of the risks and to provide information to personnel responsible for the subject matter at a
Activity Management Plan Gisborne District Council
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day to day or routine management level. They will also be used by the Risk Manager to monitor the
system and ensure its efficacy as far as circumstances permit. Sections include: Introduction, Scope
of Risk Assessment, Scope Details, Risk Assessment, Counter Measures, Question & Response
Listing and Counter Measure Triggers.
Note: See DOCS_n61277_v1_AMP_Risk_Management_Summary_-
_Counter_Measures_for_all_Utilities.xls for project recommendations.
1.b.iii GDC Human Health Risk Assessment for the Wastewater Outfall Author: EGIS Consulting ,
Sep 1999
This Risk Assessment evaluates the potential human health risks associated with sewage
effluent discharged into Poverty Bay, Gisborne. This assessment has focused on the risks to human
involved in primary contact recreation (ie. Swimmers, surfers) and shellfish harvesters who may be
exposed to microbiological contaminants present in the marine water and shellfish as a result of the
discharge of raw sewage into the Bay.
1.c.i GDC Risk Management - Water Supply Pipeline Author: Gordon Brock, 19 May 1998
This report contains all the information in relation to the Water Supply Pipeline that is
necessary for the executive management to determine what action, if any, should be taken in
respect of the risks and to provide information to personnel responsible for the subject matter at a
day to day or routine management level. They will also be used by the Risk Manager to monitor the
system and ensure its efficacy as far as circumstances permit. Sections include: Introduction, Scope
of Risk Assessment, Counter Measures, Question & Response Listing and Counter Measure
Triggers.
Note: See DOCS_n61277_v1_AMP_Risk_Management_Summary_-
_Counter_Measures_for_all_Utilities.xls for project recommendations.
1.c.ii GDC Risk Management - Dams & Storage Reservoirs Author: Kristen McPherson, 28 Sep
1998
This report contains all the information in relation to the Dams and Storage Reservoirs that is
necessary for the executive management to determine what action, if any, should be taken in
respect of the risks and to provide information to personnel responsible for the subject matter at a
day to day or routine management level. They will also be used by the Risk Manager to monitor the
system and ensure its efficacy as far as circumstances permit. Sections include: Introduction, Scope
of Risk Assessment, Scope Details, Risk Assessment, Counter Measures, Question & Response
Listing and Counter Measure Triggers.
Note: See DOCS_n61277_v1_AMP_Risk_Management_Summary_-
_Counter_Measures_for_all_Utilities.xls for project recommendations.
1.c.iii.1 Public Health Risk Management Plan – Gisborne Water Supply Author: Helen Churton, Feb
2008
The principle purpose of this Public Health Risk Management Plan (PHRMP) is to identify
potential events that present public health risks to the water supply system. Through this
identification, mitigation can occur and contingency plans can be put in place. Also, an improvement
plan to further isolate or eliminate the likeliness of this occurring is there for implementation, but
this is subject to future funding. Fields include: Identification of event, cause, preventative
measures, monitoring requirements and corrective actions.
Note: See DOCS_n61280_v1_PHRMP_Improvement_schedule_Gisborne_City_Water_Supply.pdf
for project recommendations.
1.c.iii.2 Public Health Risk Management Plan – Te Karaka Water Supply Author: Marlis Haertel,
Feb 2008
The principle purpose of this Public Health Risk Management Plan (PHRMP) is to identify
potential events that present public health risks to the water supply system. Through this
Activity Management Plan Gisborne District Council
n-49637 Page 128
identification, mitigation can occur and contingency plans can be put in place. Also, an improvement
plan to further isolate or eliminate the likeliness of this occurring is there for implementation, but
this is subject to future funding. Fields include: Identification of event, cause, preventative
measures, monitoring requirements and corrective actions.
Note: See DOCS_n61277_v1_AMP_Risk_Management_Summary_-
_Counter_Measures_for_all_Utilities.xls for project recommendations.
1.c.iii.3 Public Health Risk Management Plan – Whatatutu Water Supply Author: Marlis Haertel,
Feb 2008
The principle purpose of this Public Health Risk Management Plan (PHRMP) is to identify
potential events that present public health risks to the water supply system. Through this
identification, mitigation can occur and contingency plans can be put in place. Also, an improvement
plan to further isolate or eliminate the likeliness of this occurring is there for implementation, but
this is subject to future funding. Fields include: Identification of event, cause, preventative
measures, monitoring requirements and corrective actions.
Note: See DOCS_n61277_v1_AMP_Risk_Management_Summary_-
_Counter_Measures_for_all_Utilities.xls for project recommendations.
1.c.iv Volcano-Hydrologic Hazards in the Waipaoa Catchment Author: V Manville, July 2004
The Institute of Geological & Nuclear Sciences Ltd. (GNS) prepared a report identifying the
potential hazard from volcanic activity to the Waipaoa River catchment. Elements include:
A literature review of known volcanic impacts on the Waipaoa River,
A review of volcano-hydrologic hazards in river systems arising from eruptions of various
styles and magnitudes both globally and in NZ, with particular reference to downstream
aggradation, impacts on riparian engineering works, and chemical contamination,
An assessment of the vulnerability of the Waipaoa catchment to these hazards and a
ranking of the likelihood and seriousness of potential events, and
Recommendations for further study. (See below)
o Future research in determining the nature of hydrologic changes associated with
ashfalls of a given thickness and grain size.
o Develop a probalistic model of volcanic ash fall on the Gisborne District in order to
quantify the likelihood of hazardous levels of ash being deposited.
1.c.v GDC Emergency Management Response Plan for Bulk Water Pipeline Failure Author: Mike
Davidson, May 2008
The purpose of this plan is to provide an emergency response strategy to effectively
manage pipeline repairs or replacement and restore or maintain the service level and integrity of the
water supply to Gisborne City and rural customers. This plan applies to all emergencies where a Civil
Defence Emergency is NOT declared. Fields include: Identification of pipeline failure, pipeline
shutdown procedure, notification & response plan, communications & links, materials for
emergency and debriefing.
1.d.i GDC Risk Management – Plant & Motor Vehicles Author: Tim Crook, 7 Apr 1999
This report contains all the information in relation to the Plant and Motor Vehicles that is
necessary for the executive management to determine what action, if any, should be taken in
respect of the risks and to provide information to personnel responsible for the subject matter at a
day to day or routine management level. They will also be used by the Risk Manager to monitor the
system and ensure its efficacy as far as circumstances permit. Sections include: Introduction, Scope
of Risk Assessment, Scope Details, Risk Assessment, Counter Measures, Question & Response
Listing and Counter Measure Triggers.
1.d.ii GDC Risk Management – Staff & Industrial Relations Author: Kay Ligget, 16 Mar 1999
This report contains all the information in relation to the Staff and Industrial Relations that
is necessary for the executive management to determine what action, if any, should be taken in
respect of the risks and to provide information to personnel responsible for the subject matter at a
day to day or routine management level. They will also be used by the Risk Manager to monitor the
Activity Management Plan Gisborne District Council
n-49637 Page 129
system and ensure its efficacy as far as circumstances permit. Sections include: Introduction, Scope
of Risk Assessment, Scope Details, Risk Assessment, Counter Measures, Question & Response
Listing and Counter Measure Triggers.
1.d.iii Gisborne District Civil Defence & Emergency Services Volcanic Contingency Plan Author:
Unknown, Dec 2006
The purpose of this plan is to identify steps that the Emergency Management Team will use
to manage the lead up to and eruptive stages of a volcanic event. The recovery phase will be
managed with procedures contained in the Group Recovery Plan, except for the cleanup issue which
will have to be planned at the time.
To achieve this, the following factors are considered as the priorities for close co-
ordination.
Warning systems
Media/public information management
Essential services management, water/power/communications/fuel
Evacuations (evacuation plan)
Management of refugees – closure of Waioeka Gorge and SH 35
Logistics
1.d.iv GDC Emergency Management Plan – Water & Waste Author: Mike Davidson, Feb 2008
The purpose of this plan is to document an organisational structure and procedure
guidelines for dealing with an emergency event. This plan applies to all emergencies where a Civil
Defence Emergency is NOT declared. Sections include: Civil Defence – Responsibilities and
Structure, GDC Utilities Emergency Management Plan and Waingake Headworks Inspection Info.
Information Documents
Risk Information
Documents
Name Author Date Subject
Kaharoa Eruption
Hazards Workshop Environment B.O.P.
12 October
2003 A Regional Volcanic Contingency plan for a Kaharoa eruption.
National Civil Defence
Emergency Management
Strategy
Ministry of Civil Defence August 2003 Proposal for discussion
Guidelines for Action American Public Works
Association August 1998 Public works role in emergency management
Lifeline Utilities &
Emergency Management Ministry of Civil Defence
December
2002 Directors guidelines for lifeline utilities
Lifeline Utilities &
Emergency Management Ministry of Civil Defence
December
2002 Information for lifelines utilities
Lifelines Co-operation
Study for Water Supply Carson Group NZ
October
1998
Investigate developing a voluntary agreement between Water
authorities (nationally) for supplying assistance to another
authority who suffers major infrastructure damage from a natural
disaster
Civil Defence Report
97/5
Institute of Geological &
Nuclear Sciences report May 1997
The impact of recent falls of volcanic ash on public utilities in two
communities in the United States of America
Risk & Realities Canterbury University 1997 A multi-disciplinary approach to the vulnerability of lifelines to
natural hazards.
Activity Management Plan Gisborne District Council
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AMP Risk Management Summary
Report Name Author Date Company
GDC Risk Management - Stormwater Reticulation Tim Crook 19-May-98 GDC
GDC Risk Management - Sewerage Reticulation Tim Crook 16-Jul-98 GDC
GDC Risk Management - Sewerage Treatment & Disposal Tim Crook 16-Dec-98 GDC
GDC Human Health Risk Assessment for the Wastewater Outfall EGIS Consulting Sep-99 EGIS Consulting Australia
GDC Risk Management - Water Supply Pipeline Gordon Brock 19-May-98 GDC
GDC Risk Management - Dams & Storage Reservoirs Kristen
Mcpherson 28-Sep-98 GDC
Public Health Risk Management Plan – Gisborne Water Supply Helen Churton Feb-08 OPUS Consulting
Public Health Risk Management Plan – Te Karaka Water Supply Marlis Haertel Feb-08 None
Public Health Risk Management Plan – Whatatutu Water Supply Marlis Haertel Feb-08 None
Volcano-Hydrologic Hazards in the Waipaoa Catchment V Manville Jul-04 Institute of Geological & Nuclear Sciences Ltd
GDC Emergency Management Response Plan for Bulk Water
Pipeline Failure Mike Davidson 1-May-08 Quality System Consulting Services
GDC Risk Management – Plant & Motor Vehicles Tim Crook 7-Apr-99 GDC
GDC Risk Management – Staff & Industrial Relations Kay Ligget 16-Mar-99 GDC
Gisborne District Civil Defence & Emergency Services Volcanic
Contingency Plan Unknown Dec-06 GDC
GDC Emergency Management Plan – Water & Waste Mike Davidson Feb-08 Quality System Consulting Services
Activity Management Plan Gisborne District Council
n-49637 Page 131
Appendix E – Asset Management Approach
HANSEN PROCEDUREDEVELOPERS WORKS
(GIFTED ASSETS)
DEVELOPERS
WORKS
PRACTICAL
COMPLETION
CERTIFICATE
ISSUED
AS BUILT
PLANS & DATA
RECEIVED
D/O ALLOCATE
DRAWING No.
FILE &
PRINT COPY
NEW ASSET ID’S
ALLOCATED TO
NEW ASSETS
ASSETS
ENTERED INTO
GIS LAYER
ASSETS LINKED
TO
HANSEN IMS
DATABASE
HANSEN
ATTRIBUTE
FIELDS
POPULATED
HANSEN
WORK ORDER
GENERATED
COPY
AS BUILT
PLAN
AS BUILT
PLAN
DATA
GIS PLAN &
WO’S COMPILED
END
START
Created 30/6/2006
Initiated 30/6/2006
Updated 1/8/2008
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HANSEN PROCEDURE
CAPITAL WORKS(NEW ASSETS)
CAPITAL
WORKS
PRACTICAL
COMPLETION
CERTIFICATE
ISSUED
AS BUILT
PLANS & DATA
RECEIVED
D/O ALLOCATE
DRAWING No.
FILE &
PRINT COPY
NEW ASSET ID’S
ALLOCATED TO
NEW ASSETS
ASSETS
ENTERED INTO
GIS LAYER
ASSETS LINKED
TO
HANSEN IMS
DATABASE
HANSEN
ATTRIBUTE
FIELDS
POPULATED
HANSEN
WORK ORDER
GENERATED
COPY
AS BUILT
PLAN
AS BUILT
PLAN
DATA
GIS PLAN &
WO’S COMPILED
START
END
Created 30/6/2006
Initiated 30/6/2006
Updated 1/8/2008
File Ref. VisioDocument
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HANSEN PROCEDUREMAINTENANCE WORKS
AS BUILT
PLANS & DATA
RECEIVED
NEW ASSET ID’S
ALLOCATED TO
NEW ASSETS
ASSETS
ENTERED INTO
GIS LAYER
ASSETS LINKED
TO
HANSEN IMS
DATABASE
HANSEN
ATTRIBUTE
FIELDS
POPULATED
HANSEN
WORK ORDER
GENERATED
GIS PLAN &
WO’S COMPILED
CONTRACTORS
INITIATED
WORKS
UTILITIES
INITIATED
WORKS
GENERATE
HANSEN
MAINTENANCE
WORK ORDER
GENERATE
HANSEN
MAINTENANCE
WORK ORDER
SIGN OFF
HANSEN WORK
ORDER ON
COMPLETION
WORKS
PRODUCE
MONTHLY
AS BUILT DETAIL
REPORT
NEW
OR EXISTING NEW
EXISTING
ANY GIS
CHANGES
UPDATE GIS
ASSET &
ATTRIBUTE
FIELDS
YES
ANY
HANSEN
CHANGESYES
UPDATE
HANSEN
ATTRIBUTE
FIELDS
NO
END
NO
STARTSTART
END
Created 30/6/2006
Initiated 30/6/2006
Updated 1/8/2008
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Activity Management Plan Gisborne District Council
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HANSEN PROCEDUREHISTORICAL DATA & SPOT INSPECTIONS
AS BUILT
PLANS & DATA
RECEIVED
NEW ASSET ID’S
ALLOCATED TO
NEW ASSETS
ASSETS
ENTERED INTO
GIS LAYER
ASSETS LINKED
TO
HANSEN IMS
DATABASE
HANSEN
ATTRIBUTE
FIELDS
POPULATED
HANSEN
WORK ORDER
GENERATED
GIS PLAN &
WO’S COMPILED
START
NEW
OR EXISTING NEW
ANY GIS
CHANGES
EXISTING
UPDATE GIS
ASSET &
ATTRIBUTE
FIELDS
YES
ANY
HANSEN
CHANGES
UPDATE
HANSEN
ATTRIBUTE
FIELDS
YES
NO
END
NO
END
Created 30/6/2006
Initiated 30/6/2006
Updated 1/8/2008
File Ref. VisioDocument
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Recommended