7.5 Lower Mgeni System

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7.5 Lower Mgeni System

7.5.1 eMaphephetheni WTP Upgrade

Planning No. 106.0

Project No. UI49A

Project Status Construction phase (as of January 2012)

Project Description

The eMaphephetheni Water Treatment Plant (WTP) was originally commissioned as part of a rural scheme (Lower Ngcolosi Scheme). The WTP is located on the west bank of Inanda Dam (Figure 7.21) within eThekwini Municipality and draws water from the Nagle raw water Aqueduct 2 supplying Durban Heights WTP. The existing WTP has a treatment capacity of 0.75 Mℓ/day. The treated water is supplied into a 1Mℓ on-site storage reservoir. There has been increased demand from the WTP in recent years and the WTP currently produces an average of 2.7 Mℓ/day. It was initially proposed that the WTP be upgraded to a capacity of 2.5 Mℓ/day, allowing for later expansion to an eventual 5Mℓ/day. The growth in water consumption has necessitated that the WTP be upgraded immediately to a capacity of 5Mℓ/day. The upgrade of the WTP is complete and is at the commissioning stage. Key information on this project is summarised in Table 7.17.

Table 7.17 Project information: eMaphephetheni WTP Upgrade.

Project Components: 250mm mPVC class 9 raw water off-take pipeline from Portal Outlet No. 8 of the Nagle Aqueduct No. 2, flow measurement and control, coagulant rapid mixing, flocculation channels, clarifiers, sludge drying beds, recycle filter, dirty backwash reservoir, rapid gravity sand filters, clean backwash reservoir, chlorine contact channel and new 1Mℓ treated water reservoir (increasing the storage capacity to 2Mℓ).

Capacity: 5.0 Mℓ/day

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Figure 7.21 eMaphephetheni WTP Upgrade.

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Institutional Arrangements

Umgeni Water will own, operate and maintain the eMaphephetheni WTP and will sell potable water from this system to eThekwini Municipality as per the existing bulk water supply agreement.

Beneficiaries

The upgrade of the eMaphephetheni WTP will benefit the eMaphephetheni community and surrounding areas in eThekwini Municipality by ensuring a sustainable supply of potable water.

Implementation

The project is complete and is in the final stages of commissioning. The total cost is estimated to be R 58 million at 2014 prices.

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7.6 South Coast System

7.6.1 Nungwane Raw Water Pipeline

Planning No. 302.5

Project No. UI0657A

Project Status Design (as at March 2013)

Project Description

Water demands from the Amazimtoti WTP supply area have consistently increased over the years with the AADD (12-month moving average) as at December 2012 equalling 51.34 Mℓ/day. The sustainability of the growing demand and the efficient utilisation of the existing infrastructure prompted the implementation of the South Coast Augmentation Booster Pump Station (Section 7.6.1). The implementation of the South Coast Augmentation Booster Pump Station will only be able to sustain the total projected demand off Amanzimtoti WTP until the year 2020 with the support of the treatment of water at the Amanzimtoti WTP. The existing 450 mm diameter Nungwane Raw Water Pipeline (Figure 7.22), which supplies Amanzimtoti WTP with raw water, is in a poor condition due to the corrosive action by sulphur-reducing-bacteria and this pipeline now has to be replaced. The implementation of the South Coast Augmentation Booster Pump Station will afford a window of opportunity to replace the existing Nungwane Raw Water Pipeline before the Amanzimtoti WTP is required to augment the supply. Key information on this project is summarised in Table 7.18.

Table 7.18 Project information: Nungwane Raw Water Pipeline.

Project Components: New 450mm diameter, 13.625km long steel pipeline

Capacity: 20 Mℓ/day

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Figure 7.22 General layout of the Nungwane Pipeline.

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The Nungwane Raw Water Pipeline will be owned, operated and maintained by Umgeni Water.

Beneficiaries

The replacement of the existing Nungwane Raw Water Pipeline will benefit the residents of the Upper and Middle South Coast regions.

Implementation

The construction duration of this project is anticipated to be one year and is required by the year 2015. Currently the project is at design stage. The total cost is estimated to be R77.7 million.

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7.6.2 South Coast 2b – Kelso to Pennington

Planning No. 305.09

Project No. UI0710A

Project Status Detailed Design (June 2014)

Project Description

The South Coast Pipeline (SCP) Project was initiated to extend the supply of water to the South Coast Region. The project is implemented in a phased approach, with Phase 1 and Phase 2a completed. The South Coast Phase 2b project will consist of four components:-

- Construction of a (2600 m) pipeline from Scottburgh South to Ellingham/Park Rynie (design

has been completed)

- Design and construction of a (2250 m) pipeline from Kelso to Pennington

- Design and construction of the Mzinto River bridge crossing (550m)

- Design and construction of an (2250 m) off-take pipeline from the Kelso-Pennington pipeline

to Pennington Reservoir (Ugu)

Kelso to Pennington Pipeline The South Coast Phase 2b (SCP-2b) route will tie-in to the South Coast Phase 2A pipeline and roughly follows the SANRAL servitude along the N2 south to Pennington. This pipeline consists of a 600 mm diameter NB steel gravity pipeline with associated chambers and forms two parts extending southwards (Figure 7.23). This route includes minor stream crossings and a major bridge crossing over the Mzinto River. The pipeline will connect to the Mzinto River Bridge crossing on both the north and south banks of the bridge abutments. An off-take will be provided for a connection to the Pennington Reservoir. Mzinto River Bridge Crossing This river crossing is over 550 m long and the valley is approximately 150 m deep at the centre of the bridge. Permission has been obtained from SANRAL to attach the required pipe to the deck of the N2 Umzinto River Bridge. This will provide a considerable saving to the overall project and will minimize any environmental impacts of crossing through the river or of the construction of a new pipe bridge. Off-take to Pennington Reservoirs The pipeline will be designed as a 350 mm nominal bore with associated chambers. The pipeline will also cross a minor stream and provision must be made for connection to the existing Pennington reservoir. Mnini Pump Station To sustain the demand downstream of Quarry Reservoir the level in the reservoir should be maintained between 70% and 90%. This would require two pumps operating during peak times. It is recommended that a third pump be installed at Mnini Pump Station so that a standby pump is available. The remainder of the South Coast Pipeline will ultimately be extended from Umdoni to Hibberdene once the Lower uMkhomazi Bulk Water Scheme is in place. The SCP will finally integrate with the Bhobhoyi WTP (near Port Shepstone) Supply Scheme in the vicinity of Hibberdene. The integration of

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the two schemes will provide a measure of operational flexibility. It will serve as a contingency for drought situations in either system. The Lower uMkhomazi scheme will provide an assured supply of water to the area without being reliant on the Lower Mgeni System.


The bulk supply infrastructure of the Kelso to Pennington link will be owned, operated and maintained by Umgeni Water, who will sell potable water from this system to Ugu District Municipality as per the Bulk Water Supply Agreement.

Beneficiaries

The construction of the South Coast Phase 2b pipelines will alleviate the pressure on the Umzinto and the Mtwalume water treatment plants and supply system by supplying potable water directly to communities within the Umdoni Municipality.

Implementation

The construction of this project is anticipated to be completed towards the end of October 2016. The total cost is estimated to be approximately R109 million.

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Figure 7.23 General layout of the proposed South Coast Pipeline Phase 2b.

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7.6.3 Augmentation of Quarry Reservoir

Planning No. 305.12

Project No. UI0326A

Project Status Design is complete (as at January 2009)

Project Description

The immediate demand off the existing Quarry Reservoir is expected to be:

8.5 Mℓ/day– Singh’s and Clansthal

2 Mℓ/day– Scottburgh South Reservoir (currently supplied from the SCP-1)

4.5 Mℓ/day– Kelso – Pennington supply off the SCP-2a

4.5 Mℓ/day– Supplement to the Umzinto WTP only once both new links are installed. This equates to an AADD of 19.5 Mℓ/day. At a peak day factor of 1.25, the immediate peak demand is estimated at 24.4 Mℓ/day. With the current 7.5 Mℓ Quarry Reservoir, this equates to 9.23 hours of storage on average demand and 7.38 hours of storage at peak demand. Umgeni Water advocates 15 hours storage for a balancing reservoir if the reservoir is fed via a pumping main, which in this case Quarry Reservoir is fed via the Umnini Pump Station. The required storage based on the above requirement is 12 Mℓ when the existing 7.5 Mℓ reservoir was constructed, provision was made to construct an additional 7.5 Mℓ section attached to the one wall of the existing reservoir. It is recommended that an additional 7.5 Mℓ reservoir be constructed as laid out in the design of the existing reservoir (Figure 7.24 and Table 7.19).

Table 7.19 Project information: Augmentation of Quarry Reservoir.

Project Components: An additional reservoir to augment the total storage capacity

Capacity: 7.5 Mℓ

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Figure 7.24 General layout of the Quarry Reservoir Upgrade.

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The Quarry Reservoir will be owned, operated and maintained by Umgeni Water.

Beneficiaries

The augmentation of the Quarry Reservoir will benefit the residents of the Upper and Middle South Coast regions.

Implementation

The construction of this project is anticipated to be completed towards the end of May 2014. The total cost is estimated to be R 20.5 million at 2014 prices.

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7.6.4 Ellingham Link

Planning No. 305.13

Project No. UI513

Project Status Construction (to commence in January 2014)

Project Description

The Umzinto WTP is currently sustaining an average daily demand of 9.5 Mℓ/day. This current demand is greater than the combined yield of both the dams. Since its commissioning, Phase 1 of the South Coast Pipeline did remove some of the demand from the Umzinto WTP. However, demands on the Umzinto System have continued to increase as a result of additional supply areas being linked into the system. It has become necessary to augment the water supply to the Umzinto WTP in order to reduce the areas susceptibility to dry periods and to cater for future growth in water demands from the plant. The proposed solution is to provide a link from the South Coast Pipeline to the Umzinto WTP. The link pipeline will transport potable water from the Scottburgh South Reservoir to the Umzinto WTP (via Ellingham Reservoir). Construction of the first section of this link from Ellingham Reservoir to Umzinto WTP (known as the Umzinto Link) has been completed (Figure 7.25). This link can immediately provide a measure of support of 2 Mℓ/day to the Umzinto WTP. This augmentation can be increased to 4.5 Mℓ/day once the remaining section from the Scottburgh South Reservoir to Ellingham Reservoir (known as the Ellingham Link) has been commissioned.

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Figure 7.25 General layout of the Ellingham Link.

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Key information on this project is summarised in Table 7.20.

Table 7.20 Project components and capacity for the Umzinto emergency project.

Project Components: Ellingham Link

3 km long x 350mm diameter steel pipeline that links Scottburgh South

Reservoir to Ellingham Reservoir.

Scottburgh South Pump Station with two 9 Mℓ/day by 58m head, pump

sets (one operating and one standby).

Capacity: 9 Mℓ/day.


The bulk supply infrastructure of the Umzinto and Scottburgh South links will be owned, operated and maintained by Umgeni Water, who will sell potable water from this system to Ugu District Municipality as per the Bulk Water Supply Agreement.

Beneficiaries

The implementation of the Umzinto WTP emergency project will benefit the town of Umzinto and surrounding inland rural areas.

Implementation

The construction of the Umzinto Link was completed in 2011. The Ellingham Link is currently being designed and construction will be completed towards the end of May 2015. The total cost is estimated to be R36.5 million.

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7.6.5 Mhlabatshane Bulk Water Supply Scheme

Planning No. 305.5

Project No. UI0306A

Project Status Construction (as at January 2013 )

Project Description

Umgeni Water is currently implementing a bulk water supply scheme as part of a larger regional scheme development by Ugu District Municipality, aimed at reducing water services backlogs in certain rural areas in the Umzumbe and Hibiscus Coast Local Municipalities. This scheme extends from Phungashe, within the Nhlangwini Tribal Authority in the north, to Assisi Mission, within the Shabeni Tribal Authority, in the south. It falls mainly within the Umzumbe Local Municipality, is bounded by Sisonke District Municipality in the north, the Mzimkulu River in the west and south, the Umzumbe River in the east, and the Shabeni and KwaMadlala areas of the Hibiscus Local Municipality in the south. The bulk component of the scheme comprises of a dam on the Mhlabatshane River (a tributary of the Mzumbe River), from where water will be pumped to a 4Ml/d WTP (currently under construction) situated in close proximity to the command reservoir (Figure 7.26). Potable water will then be sold to Ugu District Municipality from a command reservoir for reticulation through an extensive gravity-fed network to the various communities in the area. Some of the reticulation components currently exist as stand-alone schemes, with the remainder still to be installed. When water demands from this scheme exceed the firm yield of the dam, then the intention is to develop the second phase of the project. Water will be abstracted directly from the Mzimkhulu River, pumped to the WTP (which will need to be upgraded to an 8Ml/d) and then fed into the reticulation system via a command reservoir. Key information on this project is summarised in Table 7.21.

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Figure 7.26 General layout of the Mhlabatshane BWSS.

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Table 7.21 Project information: Mhlabatshane BWSS.

Project Components: Phase 1: Dam – 29.9m high composite earth embankment and central concrete spillway, Raw water pump stations – at the dam and intermediate booster; Raw water rising main – 400mm dia. steel pipeline 2900m length WTP – 4Mℓ/day upgradeable to 8Mℓ/day, Potable water pump station, Potable water rising main – 350mm dia. uPVC pipeline, Reservoir – 2Mℓ upgradeable to 4Mℓ, and Potable water gravity main – 200mm dia. uPVC/steel.

Capacity: 4 Mℓ/day(initially)


Umgeni Water will own, operate and maintain the bulk water supply components of the Scheme. Ugu District Municipality will own, operate and maintain all reticulation components of the Scheme.

Beneficiaries

The supply of water is at a basic level of service for domestic use only, and a 0% population growth rate has been assumed as the area is regarded as being “deep rural” (Table7.22)

Table 7.22 Number of people per supply zone for Mhlabatshane BWSS.

Supply Zone 2007 2037

Bhekani 1197 1197

Nhlangwini (west) 25401 25401

KwaCele 1 11723 11723

Hlubi 4826 4826

Mabhaleni (west) 10426 10426

KwaCele K 9519 9519

Frankland 4200 4200

Qwabe P 6360 6360

Shabeni 16605 16605

KwaMadlala 10705 10705

Total 101062 101062

Implementation

The impounding of the Mhlabatshane Dam started on the 17 March 2012. The Water Treatment Plant is under construction and will be completed in May 2014. The total estimated capital cost for Phase 1 is R186 million. A temporary 2 Ml/day package plant is being utilized as interim measure.

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Phase 2

Water will be abstracted directly from the Mzimkhulu River, pumped to the existing WTP (which will need to be upgraded) and then fed into the reticulation system via a command reservoir. Key information on this project is summarised in Table 7.21.

Table 7.23 Project information: Mhlabatshane BWSS Phase 2.

Project Components: Phase 2:

The proposed Phase 2 project will consist of the following components:

Abstraction weir and abstraction works, with de-silting mechanism

Raw water pump station and associated electrical and mechanical works

Raw water rising main

Raw water intermediate/booster pump-stations and associated electrical and mechanical works

Balancing tanks / reservoirs

The existing 4 Mℓ/day water treatment works is to be upgraded to an 8Mℓ/day plant, which includes a clear-water pump station

Command Reservoir increase from 2Mℓ to 4Mℓ in storage capacity

Capacity: 8 Mℓ/day in total

Implementation

The total estimated capital cost for Phase 2 is R130 million. The project is currently in the detailed feasibility and preliminary design stage.

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7.6.6 Lower uMkhomazi BWSS

Planning No. 305.7

Project No. UI0711A

Project Status Planning

Project Description

An investigation at a pre-feasibility level identified that the optimum configuration, sizing, phasing and costing of all infrastructure is required for the proposed Lower uMkhomazi Bulk Water Supply Scheme (BWSS). The South Coast System needs to be augmented due to:

An increased growth in demand within the current supply zones

Proposed housing developments

The projected demand is expected to be 95 Ml/day. Key information on this project is summarised in Table 7.20 and Figure 7.28

Table 7.24 Project components and capacity for the Lower uMkhomazi BWSS

Project Components: Abstraction works

Pumpstations and associated works

Review designed Ngwadini off-channel storage dam holding 10 million m3

of raw water

100Ml/d WTW

Bulk Potable water supply infrastructure (approximately 45km of pipeline)

A solution to deliver water at the lowest possible overall cost, and with the

least environmental impact to the South Coast area

Capacity: 100 Mℓ/day.


The new infrastructure will be operated and maintained by Umgeni Water and will be part of the Bulk Supply agreement with the relevant stakeholders.

Beneficiaries

The will benefit the residents of the Upper and Middle South Coast regions.

Implementation

The infrastructure is required by 2020 to meet the increasing demands within the supply area. The total cost is estimated to be R 1.1 billion.

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Figure 7.28 Lower uMkhomazi Bulk Water Supply Scheme.

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7.7 North Coast System

7.7.1 Upgrade of Hazelmere Dam to La Mercy Bifurcation System

Planning No. 204.6

Project No. UI170A / UI160A / UI0303A / UI0304A

Project Status Construction - Raw Water Pipeline, Hazelmere WTP, , Hazelmere to Bifurcation Pump Station (as at January 2013) Commissioning - Hazelmere to Bifurcation Pipeline (as at January 2013)

Project Description

The North Coast Supply System (NCSS) supplies the northern area of eThekwini Municipality as well as the southern area in Ndwedwe Local Municipality and KwaDukuza Local Municipality both within iLembe District Municipality. The October 2013 demand on the NCSS from the Hazelmere WTP was 44.6 Mℓ/day.

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Figure 7.29 General layout of the Upgrade of the Hazelmere Dam to La Mercy Bifurcation System.

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Hazelmere Water Treatment Plant

To meet the expected future increases in demand (Section 5.5.3), the Hazelmere WTP is currently being upgraded from the existing 45 Mℓ/day to 75 Mℓ/day (98% assurance level of the yield from the raised Hazelmere Dam) with the option of ultimately upgrading the plant to 90 Mℓ/day (95% assurance level of the yield from the raised Hazelmere Dam).

Hazelmere to Bifurcation Pipeline and Pump Station

A 700 mm diameter pipeline has been constructed to augment the existing 450 mm diameter steel pipeline from the Hazelmere WTP to La Mercy Bifurcation at a length of 10 900 m. The new pipeline (capacity 60 Mℓ/day) runs parallel with and in the same servitude as the existing 450 mm diameter steel pipeline (Figure 7.29). In addition, a new pump station will be constructed at Hazelmere WTP to boost the pressure of water in this pipeline. Key information on this project is summarised in Table 7.25.

Table 7.25 Project information: Upgrade of the Hazelmere Dam to La Mercy Bifurcation System.

Project Components

Upgrade of the Hazelmere WTP from 45 Mℓ/day to 75 Mℓ/day.

New Hazelmere to Bifurcation Pipeline Pump Station

Capacity 75 Mℓ/day Hazelmere WTP 60 Mℓ/day Hazelmere to Bifurcation Pipeline and Pump Station


Umgeni Water will own, operate and maintain the Hazelmere Dam to La Mercy Bifurcation system infrastructure and will sell potable water from this system to eThekwini Municipality, Sembcorp Siza Water and ILembe District Municipality as per their Bulk Water Supply Agreements.

Beneficiaries

Both eThekwini and ILembe municipalities will benefit from this project. New developments on the KwaZulu-Natal North Coast will eventually demand upwards of 100 Mℓ/day. These developments include the new Dube Trade Port and King Shaka International Airport, and high and low income housing developments planned for the coastal area extending from Ballito to Zinkwazi. With an upgrade of the Hazelmere WTP planned to the 98% assured yield of the raised Hazelmere Dam, the Hazelmere System will be able to supply these proposed developments in the short to medium-term.

Implementation

The upgrade of the Hazelmere WTP and the raw water pipeline augmentation are currently being constructed. The construction of the Hazelmere to Bifurcation Pipeline is complete and is operational. The Raw Water Pipeline is complete and operational. The construction of the pump station is planned for completion in September 2014 and construction of the WTP is planned for completion in July 2014. The total cost of the above projects is estimated at R 224 million at 2013 prices.

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7.7.2 Southern Ndwedwe Bulk Water Supply Scheme

Planning No. 204.18

Project No. UI0701A

Project Status PH1 - Pre-Feasibility study –completion date, April 2014 PH 2 - Detailed Feasibility Study – completion date, March 2015

Project Description

iLembe DM requested Umgeni Water to consider whether there were any feasible bulk water supply options that could:

In particular, provide an alternative, more reliable source of potable water for the stand-alone rural water supply schemes that rely to a large extent on protected springs, boreholes or run-of-river abstraction, and that continue to present operational and financial challenges for the municipality; and

In general, provide an adequate supply of potable water to meet the growing needs of the area.

Umgeni Water, in close liaison with iLembe District Municipality, conducted a reconnaissance study in 2007 to assess the viability of a more reliable water supply to this area. A number of options were listed indicating the advantages and disadvantages of each option. It was recommended that some of these options be further investigated at a pre-feasibility and detailed feasibility level.

Based on these recommendations, this study, first at pre-feasibility level and thereafter at detailed feasibility level, is to assess the potential of a more reliable water supply to the Southern Ndwedwe area. The locality map of the study area is shown in Figure 7.30. It is dominated by the central and southern parts of the Ndwedwe Local Municipality (KZN293), which is predominantly rural in nature with dispersed settlement patterns.

The northern limit of the study area has been defined as the Tongati River, taking into account the nature of the area, and the likelihood that the areas to the north of the Tongati River will be supplied by other schemes that are being planned, i.e. the Ngcebo / KwaDukuza Bulk Water Supply Scheme, and the development of the Mvoti-Poort Dam together with the regional water supply scheme that will be associated with it. A short section of the study area borders onto the uMzinyathi District Municipality, but it is not envisaged, at this stage, that water will be required to be supplied into that area.

The southern boundary loosely follows the border between iLembe District Municipality and eThekwini Metropolitan Municipality. Some of the northern parts of eThekwini Metro have been included in order to allow the possibility of bulk water supply integration options that are not restricted or determined by municipal boundaries, but rather based on need and economic efficiencies. Parts of the KwaShangase and KwaChili areas are already connected to the eThekwini Metro water supply system.

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The western boundary generally follows the border between the iLembe District Municipality and uMgungundlovu District Municipality.

The eastern boundary is less easily definable, but has been selected for practical reasons that relate to the realistic extent to which bulk water supply could be delivered from an inland system (under gravity) as compared to what could be supplied from a coastal (pumped) water supply. It has also taken into account the changing land use patterns and associated settlement patterns in the eastern parts of the Ndwedwe Local Municipality.

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Figure 7.30 Southern Ndwedwe Bulk Water Supply Scheme.

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Umgeni Water will own, operate and maintain the infrastructure of the Southern Ndwedwe BWSS and will sell potable water from this system to the iLembe District Municipality as per the Bulk Water Supply Agreement.

Beneficiaries

The Southern Ndwedwe BWSS will supply both rural and peri-urban settlement areas. The population that will be supplied by the Southern Ndwedwe BWSS is presented in Table 7.26.

Table 7.26 Rural demand to be supplied by the Southern Ndwedwe BWSS by 2045 based on a medium growth scenario.

Rural Supply Area Population

Oswathini – extended boundary

149 722

Southern Ndwedwe 110 142

Msilili and Tafamasi 52 872

TOTAL 213 606

Implementation

The anticipated completion date for the Detailed Feasibility Study is March 2015.

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7.7.3 Lower Thukela Bulk Water Supply Scheme

Planning No. 204.19

Project No. UI0302A

Project Status Construction (as at January 2013)

Project Description

The town of KwaDukuza and the KZN North Coast are expected to experience high growth within the next five years (Sections 3.3.4 and 5.5.2). The Mvoti WTP, which supplies KwaDukuza is limited by its size and the availability of raw water from the Mvoti River to delivering approximately 16Mℓ/day. The raising of Hazelmere Dam (Section 4.4.3) together with the upgrade of the Hazelmere WTP will not be able to supply the estimated demand on the north coast of 115 Mℓ/day in ten years’ time (Section 5.5.3). Further augmentation of the bulk water supply to the KwaDukuza area and the KZN North Coast is therefore required in the medium to long-term. DWA have confirmed that there is up to a maximum of 110 Mℓ/day of raw water available from the uThukela River for supply to the North Coast areas. The proposed scheme will abstract water directly from the uThukela River in the vicinity of Mandini for treatment at a WTP situated in close proximity to the abstraction works (Figure 7.31). Bulk potable water can then be supplied from the WTP southwards to the KwaDukuza area and into the existing North Coast Supply System, as well as northwards to portions of the Mandini Local Municipality. This scheme will be developed in a phased manner to match the growth in demands in these areas. It will be able to supply the rural areas of Bulwer, San Soucci and St Christopher and will also supply the towns of Darnall, Zinkwazi and Blythedale in the KwaDukuza Municipality and new developments in the central Mandini Municipality area. Key information on this project is summarised in Table 7.27.

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Figure 7.31 Lower uThukela Bulk Water Supply Scheme.

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Table 7.27 Project information: Lower Thukela BWSS.

Project Components

Weir and 120 Mℓ/day abstraction works on the uThukela River.

120 Mℓ/day De-silting works.

WTP initially sized to 55 Mℓ/day and ultimate 110Mℓ/day.

Pump stations and 31 km of 950 mm diameter bulk supply pipelines to deliver water

from the WTP to KwaDukuza Municipality (and ultimately to Mandini).

30 Mℓ Command Reservoir

Capacity Initial Capacity 55 Mℓ/day Ultimate Capacity 110 Mℓ/day


Umgeni Water will own, operate and maintain the infrastructure of the Lower Thukela BWSS and will sell potable water from this system to the ILembe District Municipality as per the Bulk Water Supply Agreement.

Beneficiaries

The beneficiaries of this scheme will be the town of KwaDukuza and the areas of the North Coast region as well as areas of the Mandini Municipality. The scheme will also supply the rural areas of Bulwer, San Soucci and St Christopher and the towns of Darnall, Zinkwazi and Blythedale in the KwaDukuza Municipality. Supply from the LTBWSS could ultimately extend as far as Sembcorp Siza Water’s supply area.

Implementation

The detailed design of the Lower Thukela Bulk Water Supply Scheme is complete and the construction of the gravity pipeline from Mvoti Balancing Reservoirs to Darnall is currently underway. This will enable water to be served as far as Darnall from the Hazelmere System before the remaining components of the Lower Thukela BWS Scheme are complete. Construction of the remaining components of the scheme, including the weir and de-silting works, is planned for practical completion in December 2015. The total cost of the initial stage of the project (110 Mℓ/day Abstraction, 55 Mℓ/day WTP and 110 Mℓ/day pipelines) is estimated at R1.31 billion at 2013 prices. The second phase of construction will begin as and when demand dictates.

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7.7.4 Maphumulo Bulk Water Supply Scheme

Planning No. 204.22

Project No. UI0307A / UI0307B / UI0307C / UI0307D / UI0308A

Project Status Phase 2 - Construction of iMvutshane Dam in progress (as at January 2014)

Project Description

The areas of Maphumulo and Maqumbi, situated in the Maphumulo Municipality (iLembe District Municipality), are partly supplied with water from a number of small schemes including boreholes. The current supply of water to these areas is problematic and non-sustainable, and the majority of these areas are still classified as backlog. Umgeni Water is therefore implementing a bulk water supply option which would rationalise these small WTPs and address backlogs in the surrounding areas. The intention is to supply the communities in Maphumulo, Maqumbi and Ashville from the iMvutshane River. This river is a tributary of the Hlimbitwa River (which in turn is a tributary of the Mvoti River) and is situated approximately 10km south of Maphumulo Town. The river can yield approximately 4 Mℓ/day and a dam sited on the river can yield up to 10 Mℓ/day. The construction of a run-of-river abstraction works on the iMvutshane River and 6 Mℓ/day WTP has been completed as part of Phase 1 of the project and was commissioned in August 2013. Phase 2 of the project , which is the construction of the iMvutshane Dam on the iMvutshane River (Figure 7.32), has started and the anticipated completion date is March 2015. Key information on this project is summarised in Table 7.28.

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Figure 7.32 Maphumulo Bulk Water Supply Scheme.

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Table 7.28 Project information: Maphumulo BWSS.

Project Components

Phase 2; 3.2 million m

3 iMvutshane Dam

Phase 3; Upgrade of the WTP to 12Mℓ/day.

Capacity Phase 1: 6Mℓ/day Phase 2 & 3: 12Mℓ/day


Umgeni Water will own, operate and maintain the infrastructure of the Maphumulo BWSS and will sell potable water from this system to the iLembe District Municipality as per the Bulk Water Supply Agreement.

Beneficiaries

The Maphumulo BWSS will supply both rural and peri-urban settlement areas. The population that will be supplied by the Maphumulo BWSS is presented in Table 7.29.

Table 7.29 Rural demand to be supplied by the Maphumulo BWSS.

Rural Supply Area Population

Maphumulo 4 872

Maqumbi (Phase 1) 26 280

Masibambasane CWSS 17 248

Kwa Sizabantu 17 192

Ngcebo 2 72 900

Ashville 11 264

TOTAL 149 756

Implementation

Phase 1 of the Maphumulo BWSS has been completed. The construction of the iMvutshane Dam (Phase 2) has started and is planned for completion by March 2015. The total cost of Phase 2 of the project is estimated to be R 142 million at 2012 prices.

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7.7.5 Fawsley Park Balancing Reservoir and Pipelines

Planning No. 204.25

Project No.

Project Status Pre-Feasibility stage (as at January 2014)

Project Description

The North Coast Supply System (NCSS) is largely reliant on water resources abstracted from the Hazelmere Dam/Mdloti River and the transfer of water in a northerly direction along an extended aqueduct of some 50km. This has put Umgeni Water at a significant risk should there be a major drought in the Mdloti River catchment or should there be a major failure of the NCSS bulk supply infrastructure. To address these risks, Umgeni Water and the Department of Water Affairs (DWA) have carried out detailed investigations into the development of supplementary water resources in the uThukela River and Mvoti River catchments. These investigations led to the implementation of the Lower Thukela Bulk Water Supply Scheme (BWSS), which is at the construction phase, and the initiation of a Detailed Feasibility Study of the Fawsley Park Bulk Water Supply Scheme. All these systems will be integrated with the NCSS to meet current and future demands in the North Coast region. Hydraulic analyses have shown that it is necessary to implement part of the Fawsley Park BWSS to integrate the Lower Thukela BWSS with the existing NCSS by constructing the Fawsley Park Balancing Reservoir and the inter-connecting pipelines to tie into the existing NCSS at the existing Mvoti Balancing Reservoir complex. This will allow potable water from the Lower Thukela BWSS to be gravity-fed to the Honolulu Reservoir Complex and further to Avondale Reservoir. Key information on this project is summarised in Table 7.28 and Figure 7.33.

Table 7.31 Project information: Fawsley Park Balancing Reservoir and Pipelines

Project Components

2 x 20 Mℓ Reservoirs implemented in 10-year intervals Connecting pipelines to the Lower Tugela BWSS and the NCSSS

Capacity Reservoir 40 Mℓ (implemented in two stages at 10-year intervals)

Pipelines: 110 Mℓ/day


Umgeni Water will own, operate and maintain the infrastructure of the Fawsley Park BWSS and will sell potable water from this system to the iLembe District Municipality as per the Bulk Water Supply Agreement.

Beneficiaries

The Fawsley Park Reservoir and corresponding pipelines will supply both rural and peri-urban settlement areas.

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Implementation

The construction of this project is anticipated to be completed towards the end of December 2016. The total cost is estimated to be R100 million.

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Figure 7.33 Fawsley Park Balancing Reservoir and Pipelines.

Documents

7.5 Lower Mgeni System