PLANNING SCHEME POLICIES POLICY 20 - City of …...Water Innovations (Part 9, Division 3 of Gold Coast Planning Scheme, Vol 4), a combination of rainwater tanks and Class A+ recycled

PLANNING SCHEME POLICIES POLICY 20

RAINWATER TANKS *** REPEALED 8 SEPTEMBER 2008 ***

*** A resolution to repeal Planning Scheme Policy 20 Rainwater Tanks was made by Council on 18 August 2008 and takes effect on 8 September 2008. Policy 20 has been superseded by amendments to Policy 11 - Land Development Guidelines and State Government legislation.

Jan 2007 Rainwater Tanks 1 of 24

PREAMBLE The Planning Scheme Policy 20 – Rainwater Tanks represents the formal integration of Council’s Interim Rainwater Tank Guidelines document within Council’s planning framework and follows Council’s adoption in August 2005 of a mandatory rainwater tank policy position. The policy provides information and recommendations relating to the correct installation, operation and maintenance of rainwater tanks as required by Council and relevant Australian Standards. Technical content of the new policy has remained consistent with that of the superseded Interim Rainwater Tank Guidelines, with some requirements updated to maintain consistency with current versions of relevant legislation and standards. This policy will serve as a reference document where the installation of rainwater tanks is required as part of new Class 1 development, pursuant to the Queensland Development Code Part 25 Water Savings Targets. All new attached and detached dwellings must install and connect a rainwater tank in accordance with this policy. This includes such dwellings as stand alone single dwellings, duplexes, row houses, terrace houses, town houses and villa units. Other types of dwellings, (such as three-storey walkups) may be assessed on an individual basis as to their suitability for the conditioning of mandatory rainwater tanks. Although this policy is largely relevant to mandatory rainwater tank installations for attached and detached dwellings, it is also an important reference document for all voluntary installations, outlining not only experience-based recommendations, but also those Australian Standards relevant to all rainwater tank installations. The policy can also offer useful guidance for commercial and industrial installations prior to there being a rainwater tank policy specifically addressing these types of development. Rainwater tanks provide an alternative source of water to reticulated drinking water (drinking water supplied by the City’s water distribution network) and play a significant role in the Gold Coast Waterfuture Strategy - a blueprint for the sustainable management of the City’s water supplies over the next 50 years - endorsed by Council in late 2005. This policy will help to ensure rainwater tanks are installed, operated and maintained correctly and hence help provide a safe and more sustainable water supply to the city’s growing needs.

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TABLE OF CONTENTS

CHAPTER 1 PURPOSE 3

CHAPTER 2 APPLICATION 3

CHAPTER 3 PERFORMANCE OBJECTIVES 3

CHAPTER 4 PERFORMANCE REQUIREMENTS 4

4.1 Reticulated Drinking Water Substitution ......................................................... 4 4.2 Rainwater Uses ....................................................................................... 4 4.3 Drinking Water Supply ............................................................................... 5 4.4 Alternative Water Supplies ......................................................................... 5

CHAPTER 5 DESIGN & INSTALLATION 5

5.1 General ................................................................................................ 5 5.2 Rainwater Tank Sizing ............................................................................... 5 5.3 Rainwater Tank Siting and Setback Requirements .............................................. 7 5.4 Materials and Products .............................................................................10 5.5 Equivalent Pipe Sizes ...............................................................................11 5.6 Facilities for People with Disabilities ............................................................11 5.7 Sizing of Rainwater Pipe Work Services..........................................................11 5.8 Stormwater Drainage ...............................................................................12 5.9 Roof Drainage ........................................................................................12 5.10 Rainwater Tank Overflow Legal Point of Discharge.........................................12 5.11 Mosquito and Vector (e.g. vermin) Control ..................................................13 5.12 Pre-Treatment Devices ..........................................................................13 5.13 Proximity to Services ............................................................................14 5.14 Hot Water Uses ...................................................................................14 5.15 Pressure and Pump Requirements .............................................................15 5.16 Pump Noise ........................................................................................15 5.17 Flow Control.......................................................................................16 5.18 Irrigation Systems ................................................................................16 5.19 Marking, Labelling and Signage ................................................................16 5.20 Reticulated Drinking Water Main Connection Requirements for Tanks ..................17 5.21 Community Based Rainwater Systems.........................................................19 5.22 Surface Water Storage Tanks ...................................................................20

APPENDIX A Rainwater Tanks – Homeowner Inspection & Maintenance Checklist 21

APPENDIX B Rainwater Taps And Pipework Labels 22

APPENDIX C Drawings 24


CHAPTER 1 PURPOSE The purpose of this policy is to promote development that is more sustainable through the design, provision and installation of rainwater tanks to and within premises that utilises on-site rainwater storage to reduce the consumption of reticulated drinking water, in a manner that appropriately minimises potential health risks, environmental harm and adverse impacts on amenity. CHAPTER 2 APPLICATION This policy provides Council’s minimum standards, “performance requirements” and “deemed to comply” criteria for all development works associated with carrying out rainwater tank installations for self-assessable and assessable development works within the Gold Coast Planning Scheme in so far as it affects private property. Commercial and industrial development will be assessed on an individual basis and based on current best practice with regard to required storage capacity and uses for rainwater. It is the intention of Council to expand this document in the future to cover development that includes building classes 2-9. All references to Australian and New Zealand Standards within this policy refer to the latest edition of those Standards. CHAPTER 3 PERFORMANCE OBJECTIVES The rainwater tank installation objectives are as follows: 3.1 To Protect Health by Ensuring that:

1. Rainwater tanks minimise risks to people from injury, illness or loss of amenity due to a failure of the rainwater supply, installation, operation or maintenance.

2. Suitable rainwater facilities (e.g. taps) are provided for people with disabilities. 3. The rainwater tanks installation, operation and maintenance do not cause a public

health hazard by providing a breeding ground for mosquitoes. 3.2 To Maintain and Enhance the Quality of the Environment by Ensuring that:

1. Cumulative and adverse environmental effects comply with the Environment Protection Act.

2. Energy and water conservation measures are utilized. 3.3 To Maintain and Enhance the Community Amenity by Ensuring that:

1. The rainwater tank location and installation does not adversely affect the neighbourhood amenity.

2. The tank must be in keeping with the surrounding dwellings and/or environment. 3. The tank and associated equipment must not cause visual (e.g. location), noise (e.g.

pumps) or other nuisances to neighbours. 3.4 To Promote Development that is More Sustainable by Ensuring that:

1. The use of recycled and rainwater is maximised for non-drinking domestic and industrial purposes.

2. On-site rainwater storage is encouraged to reduce consumption of reticulated drinking water.


CHAPTER 4 PERFORMANCE REQUIREMENTS 4.1 Reticulated Drinking Water Substitution

1. Pursuant to the Queensland Development Code Part 25 Water Savings Targets, the following water savings targets must be achieved: a) 70kL per year for new detached houses; and b) 42kL/yr for other new Class 1 dwellings.

2. These reductions are additional to those achieved through other required water-saving devices eg. Flow control tapware, dual flush toilets, pressure control and water efficient appliances.

3. Minimum rainwater tank capacities and roof catchment areas required to achieve these reductions are specified in Sections 5.2.2 and 5.2.3 of this policy.

4. For properties within the Future Water Innovations Area shown on OM25 – Future Water Innovations (Part 9, Division 3 of Gold Coast Planning Scheme, Vol 4), a combination of rainwater tanks and Class A+ recycled water must be used to achieve water savings targets. Each water type shall be used in accordance with Section 4.2 of this policy.

4.2 Rainwater Uses

Each water type supplied to new detached and attached dwellings shall be used for household applications as specified in Table 1. Table 1 - Required uses for each water type within the three water supply scenarios

WATER SUPPLY SCENARIO

WATER TYPE DUAL RETICULATION

RETICULATED DRINKING WATER

OTHER THAN DUAL RETICULATION

RURAL NON-RETICULATED

Reticulated Drinking Water

Kitchen; bathroom; laundry basin; all hot water; mains top-up for tank; one optional outdoor tap

Kitchen; bathroom; laundry basin; all hot water; mains top-up for tank; one outdoor tap

N/A

Rainwater Cold water for washing machine; one outdoor tap

Toilet; cold water for washing machine; all other outdoor uses.

All uses

Recycled Water Toilet; all other outdoor uses - -

Advisory Notes

1. Queensland Health recommends against water from rainwater tanks being used for food preparation and drinking purposes where there is a reticulated drinking water supply available. For other uses with lower levels of oral exposure such as bathing or tooth brushing, Queensland Health recommends that consideration be given to the quality of the rainwater tank water and whether it is appropriate for the intended use of that water (i.e.: fit for purpose).

2. A decision on expanding the required household rainwater uses above, i.e., extending plumbing to include drinking water purposes within the house is undertaken at the risk and responsibility of the property owner. The very young, elderly or immune-compromised people should not consume untreated rainwater.

3. Rainwater quality will also be dependent on implementing an appropriate inspection and maintenance program (refer enHealth National Monograph Guidance On The Use Of Rainwater Tanks - for monitoring and maintenance requirements and GCCC homeowners inspection checklist, refer to Appendix A).

4. Refer to figures entitled, “Plumbing Schematic Rainwater Use With Back-Up Supply” and “Plumbing Schematic Trickle Back-Up Dual Water Reticulation” in Appendix C for schematic plumbing diagrams for dwellings in reticulated drinking water areas (dual and non dual reticulation).


4.3 Drinking Water Supply

Rainwater tanks installed for plumbing purposes in a reticulated drinking water area must be supplied with a continuous water supply for back-up purposes.

Advisory Notes

1. Connection to the reticulated drinking water main is compulsory as this will ensure that during low rainfall periods there is a continuous water supply to plumbing fixtures. Typical methods of connecting to the town water main are via tank back up supply or, for areas not in a dual reticulation area, rainwater control valve.

2. Water restrictions apply to rainwater tanks that are connected to reticulated drinking water systems.

3. For areas with reticulated drinking water supply, Council recommends that reticulated drinking water rather than rainwater tank water supply cold water to the bidet and haemodialysis machine, if installed.

4. For further information regarding connection to reticulated drinking water supply, refer to Section 5.20 of this policy.

4.4 Alternative Water Supplies

Development applications to Council proposing to use an alternative source of water (e.g. spring water, desalination) in an urban or rural area must be assessed by Council on an individual application basis. CHAPTER 5 DESIGN & INSTALLATION 5.1 General

Rainwater supply installations must be designed and installed as follows:

1. Avoid the likelihood of contamination of rainwater and reticulated drinking water (within both the household system and the reticulated drinking water main) by means which are appropriate to the hazard;

2. Provide rainwater to fixtures and appliances at flow rates and pressures which are adequate for the correct functioning of those fixtures and appliances under normal conditions and in a manner that does not create undue noise;

3. Avoid the likelihood of leakage or failure. Ensure rainwater system components (e.g. water level float switches, solenoid valves, pumps) are durable, require minimal maintenance and shall be adequately protected from the aggressive environment;

4. Allow reasonable access for maintenance and replacement of mechanical components; e.g.: suitable access to allow for the latest cleaning technology such as a vacuum eductor.

5.2 Rainwater Tank Sizing

5.2.1 Tank Capacity

1. The nominated tank capacities within Tables 2 and 3 may be met through the use of multiple tanks, water walls, roof water storage gutters etc, i.e. it doesn't need to be one freestanding tank.

2. The minimum capacity of rainwater tank specified in Tables 2 and 3 must be installed for all new detached and attached dwellings where the tank is mandated/conditioned by Council.

3. The measurement of tank capacity must be in accordance with AS/NZS3500.1 Section 8.

4. If the rainwater tank is to be used for plumbing purposes, then the rainwater tank must be connected to the reticulated drinking water main in accordance with Section 5.20 in this policy).


Advisory Notes

1. The following factors should be considered in determining the size of the rainwater tank for the intended use: a. Rainwater performance – Percentage % yield of water supply to be sourced from rainwater; b. Rainfall for the region – Rainfall data from Bureau of Meteorology, local rainfall stations,

Council information; c. Roof catchment size – sq/m of specific roof catchment area discharging to tank; d. Lot size – the available land to place tank, the footprint size of the tank; e. Is reticulated potable water supply available – reticulated potable water main connection

required if rainwater for plumbing purposes (e.g. in urban areas); f. Water demand – intended use and daily water usage, consumption; g. Is stormwater attenuation to be incorporated into the rainwater tank? Stormwater

attenuation is the temporary storage and slow release of stormwater to reduce flow rates into the stormwater drainage system during and immediately after a storm event.

2. It is recommended that the rainwater tank be fitted with a water level indicator so the homeowner can monitor the amount of water left in the tank. This may be a visual sight tube attached to side of tank (material must be suitable for drinking water) or a more complex sensor probe with digital read out that could be viewed from inside the house (e.g. kitchen).

5.2.2 Rainwater Tank Capacity for Dual Water Reticulation Areas

To achieve the required reductions in reticulated drinking water consumption specified in Section 4.1, rainwater tank capacities for dual reticulation areas must comply with Table 2 below. Table 2 – Tank capacities and minimum roof catchment areas for dual water reticulation areas:

DEVELOPMENT RAINWATER TANK

MINIMUM CAPACITY PER DWELLING

MINIMUM ROOF CATCHMENT

Detached Dwellings 5000 litres 100m2

Attached Dwellings and Medium Density Detached Dwellings. 3000 litres 100m2

Advisory Notes

1. For attached dwellings in community title scheme developments, the required capacity of 3000 litres per dwelling may be provided individually for each dwelling or one large combined capacity tank within the development.

5.2.3 Rainwater Tank Capacity for Reticulated Drinking Water Areas (Other Than Dual Water

Reticulation Areas)

To achieve the required reductions in reticulated drinking water consumption specified in Section 4.1, rainwater tank capacities for areas with reticulated drinking water supply other than dual water reticulation areas must comply with Table 3. Table 3 – Tank capacities and minimum roof catchment areas for areas with reticulated water supply other than dual water reticulation areas:

DEVELOPMENT RAINWATER TANK MINIMUM CAPACITY PER DWELLING

MINIMUM ROOF CATCHMENT

Detached Dwellings 5000 litres 100m2

Attached Dwellings and Medium Density Detached Dwellings. 3000 litres 100m2

Advisory Notes

1. For attached dwellings in community title scheme developments, the required capacity of 3000 litres per dwelling may be provided individually for each dwelling or one large combined capacity tank within the development.


5.2.4 Rainwater Tank Capacity for Rural Non-Reticulated Areas

In a rural non-reticulated water area, the minimum rainwater tank capacity for a residential property shall be 22,500 litres (approx 5000 gallons). To achieve this minimum capacity, more than one tank may be utilised. For larger residential properties (more occupants, bathrooms), the owner will have to engage an appropriate professional (e.g. plumber, construction hydraulic designer, tank manufacturer) to carry out calculations to justify the capacity of the rainwater tank for their specific use. It is recommended to size the rainwater tank to achieve a 90-100% surety of supply from rainwater for rural non-reticulated water properties. 5.2.5 Bushfire Water Storage Requirements for Non-Reticulated Water Areas

All developments proposed in a high and/or medium potential bushfire hazard area must provide an adequate water supply for fire fighting purposes in accordance with Town Planning Scheme Part 7 Codes – Division 3 Constraint Codes – Chapter 2 Bushfire Management Areas. To determine if your property is identified as a high or medium potential bushfire hazard, see Council’s Overlay Map OM10. For schematic plumbing diagrams pertaining to bushfire water storage, refer to figures in Appendix C. 5.2.6 Rainwater Tank Capacity for Industrial and Commercial Areas

For industrial properties and commercial properties, the owner will have to engage an appropriate professional (plumber, hydraulic consultant, tank manufacturer) to carry out calculations to justify the capacity of the rainwater tank for their intended use. 5.3 Rainwater Tank Siting and Setback Requirements

5.3.1 Amenity

The rainwater tank must be installed and located so that the amenity of the neighbourhood is not adversely affected. 5.3.2 Setbacks

To ensure that the amenity and aesthetics performance objectives are sustainable, the setback standards shown in Tables 5 and 6 of this policy must be complied with.


Table 4 – Rainwater Tank Boundary Setbacks

DOMAINS – DETACHED DWELLING, RESIDENTIAL CHOICE

Boundary Setback Type Deem to Comply

Front Boundary – above ground rainwater tank Tank installed no closer to front boundary than the building front facade.

Front Boundary – buried rainwater tank

Tank installed not within setback restriction zone.

(Council will consider approving a buried rainwater tank within setback restricted zone via an Amenity and Aesthetic Application)

Side Boundary

Rainwater tank installed no closer than 600mm.1

(Council will consider approving a rainwater tank within setback restricted zone via an Amenity and Aesthetic Application).

Rear Boundary

Rainwater tank installed no closer than 600mm.1

(Council will consider approving a rainwater tank within setback restricted zone via an Amenity and Aesthetic Application).

Water Canal - above ground rainwater tank


Water Canal – buried rainwater tank


(Council will consider approving a buried rainwater tank within setback restricted zone via an Amenity and Aesthetic Application)

Council Easement Rainwater tank not permitted within a Council easement.


Table 5 – Rainwater Tank Boundary Setbacks DOMAINS – RURAL, PARK LIVING, VILLAGE AREAS TOURIST & RESIDENTIAL, INTEGRATED BUSINESS, LOCAL BUSINESS, FRINGE BUSINESS, INDUSTRY 1&2, EXTRACTIVE INDUSTRY,

MARINE INDUSTRY, COMMUNITY PURPOSES, EMERGING COMMUNITIES Boundary Setback Type Deem to Comply

Front Boundary – above ground rainwater tank Tank installed not within setback restriction zone.

Front Boundary - buried rainwater tank


(Council will consider approving a buried rainwater tank within setback restricted zone via an Alternative Solution Process)

Side Boundary Rainwater tank installed no closer than 3.0m

Rear Boundary Rainwater tank installed no closer than 3.0m

Water Canal - above ground rainwater tank Tank installed not within setback restriction zone.

Water Canal – buried rainwater tank


(Council will consider approving a buried rainwater tank within setback restricted zone via an Alternative Solution Process)

Council Easement Rainwater tank not permitted within a Council easement.

Advisory Notes

1. If the development has a Council approved plan of development covering rainwater tank setbacks then the standards contained within Table 5 do not apply.

2. To prevent any unreasonable rise in the temperature of rainwater tank water, the heating effects of solar radiation can be minimised through careful consideration of tank colour and location (i.e. Avoid black or dark colours, seek a southerly or south-easterly location where possible and also consider the use of special paint surfaces and shade-cloth structures).

3. Rainwater tanks must be separated from the building by a gap of at least 25 mm, to allow clear and uninterrupted visual termite inspection across the inspection zone (larger tanks running parallel to building must require a larger gap e.g.: 100mm). If this cannot be achieved, the tank is to be provided with one of the barrier systems described in the Australian Standard AS3660.1 – Termite management - New building work

5.3.3 Buried Rainwater Tanks

In-ground rainwater tanks must comply with the Queensland Department of Natural Resources, Mines and Water (DNRMW) On-site Sewerage Code guidelines for horizontal separation distance and Council guidelines. Rainwater tanks must be a minimum of 20m from any buried petroleum or chemical storage tank. Rainwater tanks must not be buried in contaminated ground including ground that has been treated with anti-termite chemicals.


5.4 Materials and Products

Materials and products used in a rainwater tank plumbing installation must comply with the requirements of the national plumbing products certification scheme and be of an approved type as specified in SAA MP52 and/or Australian Technical Specifications ATS 5200. 5.4.1 Rainwater Tanks

Three types of rainwater tank authorisation will be acceptable:

1. Aboveground polyethylene rainwater tanks must be designed, manufactured and tested in accordance with AS/NZS4766.

2. Rainwater tanks made of materials other than polyethylene must have the minimum authorisation of Type Test Mark certification to ATS 5200.026 - 2004. The tank must be marked with the following: a) Manufacturer’s name, brand or trademark; b) Type Test Mark; c) Licence Number; d) “RAINWATER” sign (where applicable); e) The number of the specification, i.e., ATS 5200.026 - 2004.

3. Rainwater tanks constructed of products/materials that would not be applicable to be certified under AS/NZS4766 or ATS 5200.026 (e.g. in-situ tanks, underground rainwater tanks, bladder water storage tanks) must comply with the following: a) Rainwater tank manufacturer to appoint appropriately qualified third party to

certify that the rainwater tank has been designed, manufactured and tested in accordance with Council’s rainwater tank standards. An example of a suitable third party body is one endorsed by a JAS-ANZ certification body; and

b) Rainwater tank manufacturer is to submit the certification compliance documentation to Council.

Materials used in the construction of a rainwater tank must be suitable for its intended use, and conform fully to the following standards where applicable:

a) Polyethylene - AS/NZS4766(Int) b) Galvanised Steel - AS1397 (Min coating of 550g/m2 of strip-hot-dipped

zinc, or aluminium/zinc) c) Stainless Steel - ASTM A240/A240M d) Concrete - AS3735

5.4.2 Rainwater Tank Stands

1. Where a rainwater tank is supported on a stand or other structure, the supporting structure must be capable of withstanding any loads likely to be imposed on it.

2. A rainwater tank stand or other supporting structure must comply with AS/NZS 1170.1 permanent, imposed and other actions and AS/NZS1170.2 wind actions.

5.4.3 Buried Rainwater Tanks

1. All rainwater tanks must be sealed to prevent surface and/or ground water entering the rainwater tank. Tank access lids must be sealed and terminate a minimum 150mm above finished ground level with the ground sloped away from the tank and access lid;

2. The rainwater tank overflow invert must be a minimum of 150mm above the finished ground level. If this cannot be achieved then the tank overflow must be designed and installed to prevent the backflow of stormwater into the rainwater tank. Council approval is required on this alternative overflow design;

3. Tank access lid and inlets must be designed for trafficable loads (if applicable) and installed to prevent child access;

4. Tanks installed below ground (e.g. driveway, garage) must be designed and installed to prevent contaminants entering the tank, access lids, inlets and outlets;


5. All underground tanks in water charged areas must be designed and installed to prevent hydrostatic uplift (so as not to pop out of ground);

6. Adequate provision must be provided to inspect and carry out maintenance of the tank e.g. to desludge the tank;

7. For backflow prevention refer to Reticulated Drinking Water Main Connection Requirements in this policy - Section 5.20.

5.4.4 Products in Contact with Drinking Water

All water supply system components intended for rainwater tank applications must comply with AS/NZS 4020, SAA MP52 and ATS 5200. It is the responsibility of designers, manufacturers, suppliers and installers to verify the suitability of products for the specific application (e.g.: UPVC priming fluid and solvent cement to be suitable for drinking water). These products must clearly show Standards Marking Compliance, WaterMark Compliance or Type Test Mark Compliance. 5.4.5 Pipes and Fittings

All pipes, valves and fittings connected from the rainwater tank to the end use (water supply system) must comply with AS3500 .1 Section 2 and AS/NZS 4020 testing of products for use in contact with drinking water.

Advisory Notes:

1. Cuprosolvency is typified by general corrosion of copper pipe releasing slightly elevated levels of colourless soluble copper into the drinking water. Whilst the integrity of the copper pipe is unaffected, staining of sanitary ware and clothing can occur. Cuprosolvency can be found in both high and low alkalinity waters in Australia.

2. Blue water or copper by-product release is normally associated with soft, cold waters of low alkalinity, low disinfection residual and a neutral or slightly alkaline pH. It can be associated with cold water pitting on occasions.

3. When designing water supply systems, consideration should be given to the water source quality and that a suitable pipe material is selected to prevent pipe corrosion, cuprosolvency and blue-green water.

Refer AS 4809 Copper pipe & fittings installation and commissioning. B1.8 Methods of internal corrosion control

5.4.6 Stormwater Pipes and Fittings

Currently, storm-water materials and products do not require authorisation certification but must be of suitable standard for their intended uses; refer Clause 5.4.4 herein. 5.5 Equivalent Pipe Sizes

Must comply with AS/NZS 3500.1 Section 1. 5.6 Facilities for People with Disabilities

Hot and cold water supply taps or other operational controls must be accessible and convenient to the disabled user. All facilities must comply with AS/NZS 3500.1 Section 1. 5.7 Sizing of Rainwater Pipe Work Services

Must comply with AS/NZS 3500.1 Section 3.


5.8 Stormwater Drainage

5.8.1 General

All stormwater designs and installations shall be in accordance with AS/NZS 3500.3. This Standard specifies acceptable solutions for materials and products, design and installation of roof drainage systems, surface drainage systems and subsoil drainage systems to the point(s) of connection to the external stormwater drainage network 5.9 Roof Drainage

For all new Detached and Attached Dwellings where rainwater tanks are mandated by Council, the minimum roof catchment area for the 3000 and 5000 litre rainwater tank storage must be 100m2. To achieve efficient rainwater collection:

1. All rainwater tank roof drainage systems must be designed and installed in accordance with AS/NZS 3500.3 unless otherwise approved by Council;

2. The minimum fall on eaves gutters must be no flatter than 1:500 (0.2%) and for box gutters must be no flatter than 1:200 (0.5%);

3. Down-pipes discharging to the rainwater tank for wet systems (water charged) must have a minimum 500mm vertical distance between the rain-head and the tank inlet. The rain-head must be leaf and mosquito screened.

4. The stormwater system must be designed with provision to drain stagnant water during dry weather periods.

Advisory Notes

1. Gutters should be one continuous length with no joints. Where this is not practical lap joints are to be in the direction of flow to the nearest down-pipe nozzle;

2. It is preferable to have a minimum of two down-pipes discharging into the rainwater tank with each down-pipe receiving half of the minimum roof catchment;

3. Larger gutter profiles should be used to limit the number of down-pipes and to assist in practical rainwater tank installation;

4. Location of the rainwater tank is critical to ensure even capture of specified roof area per down-pipe;

5. For above ground rainwater tanks it is preferable to have two stormwater inlets on either end of the tank with one down-pipe per inlet;

6. Dry rainwater tank systems should be installed wherever possible to avoid stagnant water collecting in storm-water pipes.

5.10 Rainwater Tank Overflow Legal Point of Discharge

Rainwater tank placement and tank overflow must be designed to ensure stormwater does not pond under building floors or flood around foundations of buildings or cause nuisance to any surrounding properties. The tank overflow must be connected to the existing stormwater system or kerb & channel, or Council inter-allotment stormwater pit (ensure that the existing stormwater system can manage flow increase before connection).

Advisory Notes

1. To ensure the tank overflow outlet does not surcharge due to potential downstream blockage, there must be a physical air break on the outlet from the tank overflow before connecting to the stormwater drainage system. This will also act as a visual inspection point to assist in trouble-shooting drinking water back up supply failures;

2. Council approval must be obtained before connecting to its stormwater system; 3. If no Council stormwater system exists and the property falls away from the street, the tank

overflow may have to be drained to an on-site stormwater dispersion system. This method of dispersing stormwater is the least preferred method and should only be considered after all other methods have been excluded. To ensure that your stormwater dispersion system is suitable for your particular site and does not affect downstream neighbours, submit details (including engineer certification) to Council’s –Built Environment Section for approval. No fee applies for this Council on-site stormwater dispersion system approval for rainwater tank overflow.


5.11 Mosquito and Vector (e.g. vermin) Control

The breeding and spread of mosquito and vectors in and around the installed tank must be controlled, as follows:

1. Downpipe rain-heads (leaf and debris screens, or mosquito screens for wet systems), tank inlet and outlet flap valve screens must comply with the Health Regulation 1996, Part 8 - Mosquito Prevention and Destruction;

2. A tank or other receptacle used or intended to be used for the holding or storing of water or other liquid must be provided with: a) Mosquito-proof screens of brass, copper, aluminium or stainless steel gauze not

coarser than 1 mm aperture mesh of substantial construction and installed in such a manner as not to cause or accelerate corrosion; or

b) Flap valves at every opening of the tank or other receptacle; or c) Other approved means for preventing the ingress or egress of mosquitoes or other

vermin; d) Tank access hole must be appropriately sized to allow for maintenance, prevent

mosquitoes, vermin and surface water entering tank. e) Rainwater tank lids, covers and inlet down-pipes must be close fitted to exclude

mosquitoes and vermin; f) Screens must be positioned so that they are readily accessible for regular cleaning

and must be designed to exclude entry of mosquitoes and vermin into the tank;

Advisory Notes

1. It is not recommended that brass or copper screens be used in contact with galvanized steel tanks, nor be in the water which is in contact with the galvanized steel as these materials may accelerate corrosion of the tank.

2. Unless proper measures are taken, a rainwater tank can become a major mosquito breeding source.

5.12 Pre-Treatment Devices

To prevent the risk of potential contaminants adversely affecting rainwater quality and human health, the following measures must be implemented.

1. Screened down pipe rainheads, or other suitable leaf and debris device, must be installed on each down pipe. Recommended screen mesh to be 4 - 6mm and designed to be self cleaning;

2. To improve rainwater quality, a minimum 20 litres per 100m2 of the first flush of roof catchment shall be diverted/discarded before entering the rainwater tank. Individual site analysis is required in heavy pollutant areas to determine if larger volumes of first flush rainwater are to be diverted;

3. The first few rainfall run-offs from new cement tile or metal roofs must not be collected into the rainwater tank;

4. First flush devices, or acceptable alternatives, must be designed and installed with an automated diversion and drainage system. (Note: Capillary bleed tubing draining the first flush vessel is considered an automated system).

5. The capillary bleed tubing must not exceed 4 litres/hour flow rate (1.25mm orifice hole in flow restrictor will achieve 4 litres/hr) and must discharge a minimum of 1 metre away from the building footings into a garden bed or directly over a stormwater pit. Recommend filters (e.g. 955 micron) be installed in base of first flush device to prevent blockage of capillary bleed tube.

Advisory Notes

1. Before purchasing materials or paint to be used on roof catchment areas, read and observe the manufacturer’s recommendations on labels and brochures for rainwater tank suitability;

2. Measures to prevent contaminants such as dust, leaves, pollens, pesticide sprays, fertilizers, debris, vermin, birds, small animals and insects from gaining access to the rainwater system must be implemented (e.g. Gutter Guards and careful selection for location of tree species).


5.13 Proximity to Services

Rainwater service pipes must comply with AS/NZS 3500.1 Section 5 and below:

1. Rainwater service pipes installed below ground must be a minimum of 300mm away from any drinking or non-drinking water service pipe;

2. Rainwater service pipes installed above ground must be a minimum of 100mm away from any drinking or non-drinking water service pipe;

5.14 Hot Water Uses

In rural non-reticulated areas or where the owner has taken the discretion to supply rainwater tank water to the hot water system, the following conditions and advisory notes apply:

1. For hot water storage systems, the heated water must be stored at a minimum temperature of 60°C, to inhibit the growth of Legionella bacteria in accordance with AS/NZS3500.4;

2. When rainwater is supplied to the hot water heater, the hot water tempering and/or thermostatic mixing valves must be supplied with cold water from the rainwater tank, not from the reticulated potable water main. This will ensure hot and cold supplies are pressure balanced. The hot and cold water supply pressures to the tempering and/or thermostatic mixing valves must be of equal balance to operate effectively (refer to manufacturers instructions and consult with plumber, construction hydraulic designer).

Advisory Notes

1. Instantaneous hot water heaters may require high performance tempering valves (check with manufacturer, plumber, construction hydraulic designer);

2. For standard residential dwellings it is recommended to reduce the high-pressure losses through a 15mm tempering valve. This can be achieved by minimising the number of plumbing fixtures (i.e. flow) supplied through the 15mm tempering valve. It is preferred that tempered hot water be connected to the minimum plumbing fixtures required (e.g. bathroom, refer AS3500.4) and non-tempered hot water be connected to the laundry and kitchen sink. Alternatively, if it is preferred to temper the whole hot water system, recommend to use a 20mm tempering valve and have 20mm cold to heater and 20mm hot outlet from heater to tempering valve and 20mm from tempering valve to first hot plumbing fixture (consult with plumber, construction hydraulic designer);

3. The hot water heater will be supplied with both rainwater and, where connected, reticulated drinking water (during dry weather periods) and it is recommended that confirmation is sought from the manufacturer if any specific sacrificial anode is required for the installed heater. To overcome this anode selection and the maintenance replacement of anode (replacement approx every 5 yrs), a stainless steel hot water heater could be installed which does not require a sacrificial anode.

4. Hot water heaters are to be located as close as possible to the points of use. Council recommends green house gas efficient hot water heaters (e.g. solar or gas) where their installation is not mandatory;

5. It has been reported that there is potential for hydrogen gas to build up in a hot water system with the combination of certain conditions. The conditions required are mild steel hot water heater, magnesium sacrificial anode, water supply high in total dissolved solids (could be certain rainwater supplies) and if the home has been left vacant for extended periods. The construction hydraulic designer is to consider this possibility of hydrogen gas build up when nominating the type of hot water system. If the mild steel hot water system is nominated advice is to be given to the homeowners’ that if they are to leave their home vacant for extended periods, and to ensure no potential of hydrogen gas explosion occurring, then all hot water taps are to be purged open upon returning to the house before the washing machine or dishwasher is used. Persons must not smoke while this preventive action is undertaken.


5.15 Pressure and Pump Requirements 1. Provision must be made to ensure that the maximum operating pressure at any outlet,

other than a fire service outlet, within a building does not exceed 500kpa and the pressure limiting valve must be accessible for maintenance purposes at all times e.g. path box.

2. Minimum working pressure at the most disadvantaged plumbing fixture or outlet must not be less than 50kpa at the minimum flow rate required.

Advisory Notes

1. To determine the appropriate pump for your rainwater tank system, the following should be considered: a. Number of plumbing fixtures and flow rates to be served by rainwater supply – determine

probable simultaneous flow rate for the building; b. Number of people living in the house; c. Is the building single or double storey residence – Height from rainwater tank pump to most

disadvantaged fixture outlet; d. Residual head of most disadvantaged plumbing fixture; e. Pressure drop and index length of the rainwater system – refer to AS3500.1; f. Type of hot water system and if special tapware is to be installed – flick mixers may

require extra pressure to perform satisfactory; g. Pumps must have a safety device to prevent the pump running dry (burn out); h. Installation of a filter upstream of the pump may be required to improve water quality and

operation of downstream valves, e.g. hot water tempering valve; i. Maximise energy efficiency - select a pump that is efficient for the intended use, do not

over or under size the pump and refer to the pump manufacturer’s efficiency curves; j. Constant pressure control valve – this device should be installed with a pump as it ensures

constant pressure and flow at the outlet when a tap is turned on; k. If considering installing a pump pressure cell, ensure that it is sized to reduce the number

of starts of the pump. For a standard residential dwelling a minimum eighteen (18)-litre pressure cell is normally recommended. Pressure cells require servicing at regular intervals to ensure minimum air pressure is maintained in the cell for optimum operation (Bladder replacement recommended approximately 5 yearly intervals).

2. Once you have all this information, consult your plumber and/or construction hydraulic designer and/or pump supplier to determine appropriate pump for your intended use.

5.16 Pump Noise

1. All rainwater tank pumps must be installed so as noise levels from any pump do not create a noise nuisance to occupants and/or any neighbouring properties;

2. Pump must be designed, located and installed such that, at any given time, its operation cannot be heard by an individual who is an occupier of any neighbouring residence;

3. If pump installed external to tank - An acoustic enclosure must be fitted, (e.g. poly/plastic cover or wooden box with an absorbent lining). This can be very effective and relatively inexpensive. It is important that the unit has adequate ventilation, ask for advice from the pump manufacturer and/or installer.

4. Ensure servicing requirements are followed as per the manufacturer’s guide.

Advisory Notes

1. To reduce the potential noise concerns from rainwater tank pumps in urban areas (small block size e.g. 400m2 - houses close to boundaries), the following specifications could be utilized to address this noise issue. These specifications would assist in compliance with the noise emission criteria but are not considered as the only measures to be incorporated. a) Installation of submersible rainwater pressure pumps; b) Erection of a solid fence, lapped fence palings; c) Locate pump as far away as possible from neighbours and away from sensitive areas (e.g.

bedroom windows); d) Avoid placing the pump near a noise-reflective surface (e.g. alcoves, walls).


5.17 Flow Control

1. Specific plumbing tap outlets must be flow controlled either inline or within each cold and hot water tap except showers, which have the option of end of line device integral within AAA shower rose;

2. For flick mixer tap ware (e.g.: kitchens) the flow control devices can be either inline or within the hot and cold control valve (e.g. mini cistern control valves) located under the sink;

3. Flow control must not be inserted at the end of line/fixture outlet (e.g. between wall outlet and shower rose or in aerator housing);

4. All flow control devices must comply with ATS 5200.037; 5. Flow control devices must be marked on the immediate packaging of each device with

the following: a) Manufacturer’s name, brand or trademark. b) WaterMark. c) License number. d) Model number. e) The number of this specification, i.e., ATS 5200.037.

5.18 Irrigation Systems

1. Rainwater used for irrigation systems from roof catchments into tanks must comply with Section 5.19 “Marking, Labelling and Signage” of this policy;

2. Rainwater used for irrigation systems from surface water catchments must comply with Section 5.22 “Surface water storage tanks” of this policy;

3. All irrigation systems must comply with the backflow prevention requirements of AS/NZS3500.1;

4. Council recommends that automatic timers be used for irrigation systems, and where applicable drip systems, local native plants, regular mulching and rain/soil moisture sensors.

Advisory Notes

1. The water supply system from a rainwater tank used for irrigation purposes must be marked accordingly.

5.19 Marking, Labelling and Signage

5.19.1 General

Pipes, outlets and fittings supplying rainwater and non-drinking water must be clearly identified. Refer to Appendix B for illustrations referenced within this Section. 5.19.2 Rainwater Marking, Labelling and Signage

1. Green coloured identification tape marked “CAUTION RAINWATER LINE BURIED BELOW” must be used for underground rainwater pipes to and from the tank. The tape must be 75 – 100mm wide and state “CAUTION RAINWATER LINE BURIED BELOW” at one-metre intervals along the identification tape (Ref: Fig 1). The tape must be attached to the top of the pipe at intervals not exceeding three metres with duct tape or cable ties. Identification markings must comply with AS1345.

2. Pipe markers must be used to identify all above ground rainwater pipe work (accessible and non-accessible) for all above ground non-accessible rainwater pipe work (e.g. plumbing rough-ins), the pipe markers are to be placed on the pipe at intervals not exceeding 1m in length. For all rainwater pipe work installed in accessible locations within buildings (e.g. car park basements), the pipe markers are to be placed on the pipe at intervals not exceeding 8m in length and adjacent to branches, valves, wall and floor penetrations. Identification markings shall comply with AS1345 (Ref: Fig 3).

3. For pipework greater than 40mm in diameter, pipe markers will be stickers clearly displaying the word “RAINWATER” (Ref: Fig 3). Pipework less than 40mm in diameter must have a continuous green pipe marker band (Code Tape) around the circumference of the pipe with the


word “RAINWATER” in not less than 4 mm upper-case letters placed longitudinally along the pipe so that the marking is visible from all viewing directions (Ref: Fig 2).

4. All external hose taps that are supplied with rainwater must be identified with a metallic safety sign (100mm long x 75mm wide) labelled “RAINWATER”, which must be securely fixed (e.g. two screws into brick work, not mortar) above the rainwater hose tap outlet. The words and symbol are to be in black writing on a yellow background. The hose tap must be fitted with a hose connection vacuum breaker or backstop valve. Signs must comply with AS1319 (Ref: Fig 4).

5. All internal rainwater outlets must be identified as “RAINWATER” via a “RAINWATER” label (e.g. cold and hot water tap buttons (Ref: Fig 6.1)

6. All cistern cocks supplying rainwater must have the words “RAINWATER” clearly etched into either the cock cap or associated bezel (Ref: Fig 6.2).

5.20 Reticulated Drinking Water Main Connection Requirements for Tanks

All rainwater tanks used for plumbing purposes must be connected to the reticulated potable water supply system (where available) on full mains rate, to maintain the reticulated water storage zone within the rainwater tank during dry weather periods (Refer to Advisory Note 1 and 2 to this sub-section). Connection between service pipes must comply with AS/NZS 3500.1 Section 14 and these guidelines. An approved back-flow containment and zone prevention device must be connected in accordance with Australian Standard AS/NZS 3500, to ensure that there is no back-flow into the reticulated drinking water system. Tank back up supply valves must be installed in an accessible location (e.g. valves on top of rainwater tank), with no valves installed in the rainwater tank.

Advisory Notes

1. When setting the reticulated potable water storage capacity consideration is to be given to the shape of tank (required head over pump), maximum flow-rate of downstream fixture, prevention of air being sucked into the pump and ball float flow tolerances. Additionally, this storage capacity is to be set so it does not overly reduce the potential rainwater yield by having too much back up storage. Example of a suitable storage capacity is having the reticulated potable water main inlet float valve set so a water level of 100mm above the tank outlet is maintained.

2. Full flow is required, instead of trickle flow controlled, to minimise the risk of the tank running out of water (e.g. if external irrigation system is left on). If your development has significant landscaping then consideration should be given to the type of irrigation system installed. Designers should specify automatic timers for the irrigation system and on special circumstances approval for direct connection to the reticulated potable water supply may be given (Note: applicant to justify at plumbing & drainage approval stage).

5.20.1 Rainwater Tank Air Gap Back-Up Connection

Inlet float valve systems shall be provided with an air gap that is visible at the tank’s inlet screen. Air gap back-up connections must comply with AS/NZS3500.1 for Sections 4 and 8. The minimum air gap is obtained from AS/NZS3500.1 via Section 4 Table 4.3 and Section 8. 5.20.2 Rainwater Control Valve (Automatic Valve)

For properties within the Future Water Innovations Area shown on OM25 – Future Water Innovations (Part 9, Division 3 of Gold Coast Planning Scheme, Vol 4), rainwater control valves or automatic valves are not permitted. For properties outside the Future Water Innovations Area shown on OM25 – Future Water Innovations (Part 9, Division 3 of Gold Coast Planning Scheme, Vol 4), direct connection of rainwater and reticulated potable water supply may be via valves that have obtained the WaterMark certification in accordance with ATS5200.466 and/or ATS5200.462. This rainwater control valve must be appropriately sized for the intended use, such as pipework, fittings, backflow prevention device, and ensure the pressure, flow, and velocity performance requirements are satisfied. Refer to figure


entitled “Plumbing Schematic Rainwater Use Rainwater Control Valve” in Appendix C for a schematic plumbing diagram incorporating a rainwater control valve. 5.20.3 Backflow Prevention Requirements

1. Backflow prevention must comply with AS/NZS3500.1:2003 Section 4, 8 and 14 (2003 version).

2. In areas with reticulated drinking water supply, Council shall provide water containment protection at the property boundary. Where there is an existing water meter, this must be converted to a meter suitable for rainwater tank installations. All other backflow prevention requirements must comply with Table 7 below.

Table 6 – Backflow prevention: rainwater tanks in reticulated drinking water supply areas.

FORM OF CROSS

CONNECTION

HAZARD RATING

CONTAINMENT PROTECTION BACKFLOW PREVENTION DEVICE (AT PROPERTY BOUNDARY

WATER METER)

INDIVIDUAL OR ZONE PROTECTION BACKFLOW PREVENTION DEVICE3 (AT CONNECTION POINT OF

RAINWATER CONTROL VALVE OR TANK BACK UP SUPPLY)

Combined Internal and External Plumbing Purposes1

Buried rainwater tank in non-sewered area

Medium Testable device2

Testable device Or Unregistered air gap for rainwater tank back up supply3

Buried rainwater tank in sewered area

Low Non-Testable device

Non-Testable device Or Unregistered air gap for rainwater tank back up supply3

Partly buried tank in sewered or non-sewered area



Above ground tank in sewered or non-sewered area



External Plumbing Purposes1 External hose taps and irrigation only. i.e. No connection of rainwater tank system to the town water main.1

Low Non-Testable device Not applicable

Hose Taps – Reticulated Drinking Water Main and Rural Areas All external hose taps (e.g. reticulated drinking water main, rainwater, recycled and surface water).

Low Not applicable Non- Testable device


FORM OF CROSS

CONNECTION

HAZARD RATING

CONTAINMENT PROTECTION BACKFLOW PREVENTION DEVICE (AT PROPERTY BOUNDARY

WATER METER)

INDIVIDUAL OR ZONE PROTECTION BACKFLOW PREVENTION DEVICE3 (AT CONNECTION POINT OF

RAINWATER CONTROL VALVE OR TANK BACK UP SUPPLY)

NOTES: 1. If the property owner wishes to connect their rainwater tank to the reticulated potable water main

when used for external purposes (hose taps and irrigation) then backflow prevention is to comply with rows under the heading Combined Internal and External Plumbing Purposes.

2. The selection of the backflow prevention device should be determined based on the level of hazard in the immediate environment. The application of a risk assessment process may permit the selection and approval of a lower hazard backflow prevention device, subject to the building and plumbing layout, the facilities installed and the topography of the allotment.

3. Air gaps shall be visible when standing adjacent to the rainwater tank.

5.21 Community Based Rainwater Systems

The following items must be addressed when lodging an application to Council for approval of a community based rainwater tank system:

1. Plumbing & Drainage approval must be obtained from Council for your rainwater tank system prior to it being installed.

2. Full hydraulic drawings of the rainwater tank system from roof catchment to tank and from tank to plumbing fixtures must be approved by Council.

3. If the applicant proposes to use the rainwater for drinking purposes and/or food preparation then a monitored disinfection system must be provided to assure water quality (Refer to Advisory Note 2 of this sub-Section).

4. Rainwater tanks installed in an area with reticulated drinking water supply must be supplied with a continuous water supply. Connection to the reticulated potable water main is compulsory (Refer to Advisory Note 3 of this sub-section).

5. Management Plans for community based systems including a flow diagram of the system (catchment area, storage tanks, pipe work, tap locations) together with a description of preventive measures, monitoring schedules and prescribed corrective actions must be approved by Council prior to the system being installed.

6. Certification of the system by Council’s Health and Regulatory Services Department must be undertaken annually (Refer to Advisory Note 4 of this sub-section).

7. Design life expectancy of underground non-accessible (e.g. under building slab, garage) rainwater tanks and components must be a minimum of 50yrs.

8. Prior to the installation of a large in-situ rainwater tank, a suitably qualified Engineer’s certification must be submitted with other plumbing approvals.

9. Tank overflow details must be submitted to Council to prevent surcharging back into the tank if a stormwater blockage occurs (e.g. physical air break between tank overflow and stormwater drainage),

10. Details of pre-treatment devices (e.g. screened railheads, first flush devices) for potential contaminants and mosquitoes that may enter the rainwater tank system must be provided prior to the installation of the system.

11. Pump performance – must comply with the pump and noise section of this policy (5.15 and 5.16).

12. Backflow prevention – Refer to the Reticulated Potable Water Main Connection section of this policy – Section 5.20

13. Marking and labelling – Refer to Section 5.19 of this policy. 14. Rainwater tank inspection and maintenance schedule must be incorporated into the

Community Title Scheme – Building Plan. A Terms of Use document containing conditions and responsibilities for occupants and Body Corporate must be incorporated in the Community Title conditions.


Advisory Notes

1. Rainwater tanks installed in multiple ownership title situations (e.g. community title schemes, resorts, nursing homes, hospitals and industrial factories), require greater water quality surety (preventative measures and management procedure) due to the exposure of a larger number of people to potential health risks from the one system.

2. Example of a monitored disinfection system could be an ultraviolet light disinfection unit with service and maintenance program and a failure alarm indicator with corrective action procedure. A Hazard Analysis Critical Control Point (HACCP) management plan would be suitable for this process.

3. Connection to the town water supply will ensure that during low rainfall periods there is a continuous water supply. Typical methods of connecting to the town water main are via tank back up supply or rainwater control valve (except for areas located in dual reticulated areas).

4. A traditional approach to verification is regular testing for the faecal indicator, E. coli. If a community-based supply is in an area subject to industrial emissions or high levels of urban traffic, chemical testing may also be warranted.

5. Turnover time may be extremely long for large rainwater tanks. If dissolved oxygen levels subsequently fall over time, the tanks could be odorous due to fermentation of organic matter from roof catchment.

5.22 Surface Water Storage Tanks

Surface water is that water sourced from paved and unpaved surface areas as opposed to rainwater sourcing from roof catchment areas. Council does not recommend the use of surface water for drinking water or for any internal water use. There shall be no physical connection of surface water with the rainwater tank plumbing system and/or the reticulated potable water main. Surface water marking, labelling and signage shall comply with Section 5.22.1 of this policy. For all other aspects of design and installation, surface water storage tanks shall comply with this policy.

Advisory Notes

1. Surface water catchments differ from roofwater catchments in that there are different types and volumes of pollutants. For surface water catchments, there is an increased potential for human faecal contamination of the water storage tank, which is considered a higher risk of illness compared to bird faecal contamination potentially sourced within roofwater catchments.

5.22.1 Surface Water Marking, Labelling and Signage

Refer to Appendix B for illustrations referenced within this section.

1. All above ground surface water pipework greater than 40mm in diameter (including internal rough-in) is to be identified with a green sticker marked “NON-DRINKING WATER” (refer: Fig 9).

2. Pipe work less than 40mm in diameter must have a continuous green pipe marker band (code tape) around the circumference of the pipe with the words “NON-DRINKING WATER” in not less than 4 mm upper-case letters placed longitudinally along the pipe so that the marking is visible from all viewing directions (Ref: Fig 8).

3. For all above ground non-accessible surface water pipework (e.g. plumbing rough-ins), the pipe markers are to be placed on the pipe at intervals not exceeding 1m in length.

4. For all surface water pipework installed in accessible locations (e.g. car park basements), the pipe markers are to be placed on the pipe at intervals not exceeding 8 metres and adjacent to branches, valves and wall and floor penetrations. Identification markings must comply with AS1345.

5. All underground surface water pipework to or from the surface water storage tank shall be marked with 100mm wide green marking tape stating “THE PIPE BELOW IS NON-DRINKING WATER” (refer: Fig 7). The marking tape shall be fastened to the pipe, with duct tape or cable ties, at a maximum of 3 metre intervals.

6. All hose taps that are supplied with surface water must be identified with a colourbond white sign with black wording “NON-DRINKING WATER DO NOT DRINK” (Ref: Fig 10) 100mm long x 75mm wide and include a symbol of a hose tap and cup with red circle and diagonal cross through the circle. The sign is to be securely fixed above the tap (e.g. two screws into brick work not mortar). The hose tap must be fitted with a hose connection vacuum breaker or backstop valve. Signs shall comply with AS1319.


APPENDIX A Rainwater Tanks – Homeowner Inspection & Maintenance Checklist STORMWATER INSPECTION INTERVALS PASS FAIL

Roof catchment – roof and flashings checked for defects and repairs, overhanging branches removed. 6 months

Gutter and Downpipes – Clean gutters, removing leaves and debris. 3 months

Clean leaf guards on rainheads. Check mosquito screens in rainheads.

Oct-March monthly & April-Sept quarterly

First flush device – remove rubbish collected in device, check where first flush drain is discharging. Is drain causing a nuisance, erosion?

3 months

Rainwater tank overflow - Where is overflow discharging. Is it causing a nuisance-erosion? Check mosquito screen on tank overflow outlet. If tank overflow leaking in dry weather check trickle top up valve for failure.

Oct-March monthly & April-Sept quarterly

If stormwater drainage is wet system, drain stagnate water from access relief point. 6 months

TANK INSPECTION

Rainwater tank inspection – check for defects, cracks, mosquito proof screens adequate, openings have close fitting lids. 6 months

Check for signs of mosquitoes and larvae. 6 months

Rainwater tank support– if on stand or concrete slab structural integrity of support. 1 year

Check level of sediment in the tank. Use battery torch shine through tank access hole for inspection. Regular monitoring of the water quality - colour, signs of sediments. (Commercial contractors - tank vacuum cleaners available)

2 years

WATER SUPPLY INSPECTION Check tank water quality – must be clear, no taste or smell. If unsure of quality, arrange for water quality test at Council’s Laboratory – Coombabah (Scientific Services 07-55817100).

6 months

Check rainwater taps have correct signage installed. 6 months

If water filters installed – regular cleaning and replacement is required.

As per manufacturers req

PUMP INSPECTION Pump noise check – if excessive this may indicate bearing failure or rubbing of internal components, contact pump manufacturer or service person to service.

6 months

Pump acoustic enclosure is adequate. 6 months

Pump pressure cell - air pressure is checked (refer pump manufacturers specifications). 6 months

Pump leaks – check for water around pump, if leaking this will cause pump cycling, waste of water. Contact pump manufacturer or service person to service.

6 months


APPENDIX B Rainwater Taps And Pipework Labels Figure 1: Underground Identification Tape

CAUTION RAINWATER LINE BURIED BELOW Figure 2: Pipe Code Tape – for pipes less than 40mm

RAIN WATER RAIN WATER RAIN WATER RAIN WATER RAIN WATER

Figure 3: Pipe Stickers – for pipes 40mm and greater

RAIN WATER

Figure 4: External Hose Tap Sign Figure 5: Internal Rainwater Outlets


Figure 6: Cistern Cock Markings

Fig 6.1: Cistern Cock Cap Etching

Fig 6.2: Cistern Cock Bezel Etching

Surface Water Catchment – Non-Drinking Water Figure 7: Underground identification tape:

THE PIPE BELOW IS NON-DRINKING WATER Figure 8: Pipe Code Tape – for pipes less than 40mm

NON-DRINKING WATER NON-DRINKING WATER NON-DRINKING WATER NON-DRINKING WATER NON-DRINKING WATER

Figure 9: Pipe Stickers – for pipes 40mm and greater

NON-DRINKING WATER

Figure 10: Non-Drinking Water Sign


APPENDIX C Drawings

Jan 2007 Rainw

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Jan 2007 Rainw

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Jan 2007 Rainw

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Jan 2007 Rainw

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Jan 2007 Rainw

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Jan 2007 Rainw

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Jan 2007 Rainw

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Documents

PLANNING SCHEME POLICIES POLICY 20 - City of …...Water Innovations (Part 9, Division 3 of Gold Coast Planning Scheme, Vol 4), a combination of rainwater tanks and Class A+ recycled