7 . 7 NNN ORTH CCC OAST SSS Y S T E M
7 . 7 . 1 UUU PGRADE OF HHH AZELMERE DDD AM TO LLL A MMM ERCY BBB IFURCATION SSS Y S T E M
Planning No. 204.6 Project No. UI170A / UI160A / UI0303A / UI0304A Project Status Design - Raw Water Pipeline, Hazelmere WTP, Hazelmere to Bifurcation Pipeline, Hazelmere to Bifurcation Pump Station (as at January 2011)
Project Description The North Coast Supply System (NCSS) supplies the northern area of eThekwini Municipality, the southern area in Ndwedwe Local Municipality and KwaDukuza Local Municipality both within Ilembe District Municipality. The October 2010 demand on the NCSS from the Hazelmere WTP was 39.5 Ml/day. Figures 5.65 to 5.68 provide an estimate of future demand growth of the NCSS. This growth will soon exceed the capacity of the Hazelmere WTP, the Hazelmere raw water pipeline and the Hazelmere to La Mercy Bifurcation Pipeline and Pump Station. The following projects have been initiated to ensure that the NCSS can supply the demand on the KwaZulu-Natal North Coast in the short to medium-term.
Raw Water Pipeline Hazelmere WTP receives raw water from Hazelmere Dam through a 2 420 m, 600 mm diameter raw water pipeline. This pipeline is able to deliver the current full supply capacity of 45 Ml/day required at the WTP. However, with an increase in the WTP planned to 75 Ml/day and ultimately 90 Ml/day, the raw water pipeline will have to be augmented. A new 700mm diameter pipeline is planned for this augmentation and will be placed in the existing raw water pipeline servitude ( Figure 7.29). This pipeline will also carry sufficient capacity to ensure that the existing 600mm diameter pipeline can be taken off-line for routine maintenance.
Hazelmere Water Treatment Plant To meet the expected future increases in demand ( Section 5.5.3 ), the Hazelmere WTP will initially be 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).
HazelmHazelmereereereere to Bifurcation Pipeline and Pump Station The 450 diameter pipeline from Hazelmere WTP to the La Mercy Bifurcation constrains the full supply capacity to both the Avondale and La Mercy reservoirs to 22Ml/day. This pipeline will have to be augmented if future supply is to meet the projected demands of the NCSS. A 700 mm diameter pipeline is proposed to augment the existing 450 mm diameter steel pipeline from the Hazelmere WTP to the La Mercy Bifurcation at a length of 10 900 m. The new pipeline (capacity 60 Ml/day) will run 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 have to be constructed at Hazelmere WTP to boost the pressure of water in this pipeline.
Key information on this project is summarised in Table 7.27 .
399 Table 7.27 Project information: Upgrade of the Hazelmere Dam to La Mercy Bifurcation System.
Project New 700 mm diameter raw water pipeline. Components Upgrade of the Hazelmere WTP from 45 Ml/day to 75 Ml/day. New 700 mm diameter Hazelmere to Bifurcation Pipeline New Hazelmere to Bifurcation Pipeline Pump Station Capacity 50 Ml/day Raw Water Pipeline 75 Ml/day Hazelmere WTP 67 Ml/day Hazelmere to Bifurcation Pipeline and Pump Station
Institutional Arrangements 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 Metro, 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 ( Sections 2.4, 2.8, 3.3.4 ). 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 is currently being designed, while the design of the raw water pipeline augmentation and the Hazelmere to La Mercy Bifurcation Pipeline and Pump Station are complete. The construction of these projects is planned for completion to coincide with the completed construction of the Hazelmere WTP augmentation. The total cost of the above projects is estimated at R 232 million at 2010 prices.
400
Figure 7.28 General layout of the Upgrade of the Hazelmere Dam to La Mercy Bifurcation System.
401 7 . 7 . 2 UUU PGRADE OF NNN DDDWEDWED WEDWE RRR ESERVOIR 111 AND RRR ESERVOIR 222
Planning No. 204.18 Project No. UI135A / UI136A Project Status Construction (as at January 2011)
Project Description The Ndwedwe Reservoir 1 is situated within eThekwini Municipality and Ndwedwe Reservoir 2 within the Ndwedwe Local Municipality of Ilembe District Municipality (Figure 7.30 ). These distribution reservoirs fulfil the function of both balancing and supply to various reticulation networks ( Section 5.5.1 ). The Ndwedwe Reservoir 1 receives 8.5 Ml/day from the Ndwedwe Pump Station located at the Hazelmere WTP. The Ndwedwe Reservoir 2 receives 5.6 Ml/day from the Ndwedwe Reservoir 1 Pump Station. Both of these reservoirs have a capacity of 2 Ml. There is a disproportionate amount of flow through these reservoirs when compared to their size and this creates operational problems and affects the lifespan of the supply pumps. These reservoirs are now being upgraded through the construction of an additional 2Ml reservoir at each site.
Key information on this project is summarised in Table 7.28 .
Table 7.28 Project information: Upgrade of Ndwedwe Reservoir 1 and Reservoir 2.
Project New 2 Ml reservoir at Ndwedwe Reservoir 1 site. Components New 2 Ml reservoir at Ndwedwe Reservoir 2 site. Capacity 2Ml each
InstitutInstitutionalional Arrangements The new Ndwedwe Reservoirs 1 and 2 will be owned, operated and maintained by Umgeni Water, who will sell potable water from this system to eThekwini Municipality and Ilembe District Municipality as per the Bulk Water Supply Agreements.
Beneficiaries Ndwedwe Reservoirs 1 and 2 currently serve rural communities of both eThekwini Metro and the Ndwedwe Local Municipality. Additional storage at these reservoir sites will ensure sustainable supply to the existing communities by balancing peak flows and by providing emergency storage for direct consumers.
Future beneficiaries of this upgrade will include any expansions to the existing Ndwedwe supply system.
Implementation Both reservoirs are currently being constructed with planned completion in May 2011. The total cost is estimated to be R 16 million at 2010 prices.
402
Figure 7.29 General layout of the Upgrade of Ndwedwe Reservoirs 1 and 2.
403 7 . 7 . 3 HHH ONOLULU TO MMM VOTI BBB ALANCING RRR ESERVOIR PPP IPELINE
Planning No. 204.3 Project No. UI0305A Project Status Construction (as at January 2011)
Project Description Umgeni Water currently manages the supply of potable water to the town of KwaDukuza from the Mvoti WTP via an abstraction on the Mvoti River. Recently the WTP has been operating at 16 to 18 Ml/day. This is above the 12 Ml/day design capacity of the WTP and is unsustainable. Umgeni Water has recently upgraded the pipeline from Avondale Reservoir (Ballito) to Honolulu Reservoir and is now able to supply an additional 2.5 Ml/day from the Hazelmere WTP to KwaDukuza via the existing Honolulu to Mvoti Balancing Reservoir Pipeline ( Figure 7.31 ). The diameter of this Honolulu to Mvoti Balancing Reservoir Pipeline and the capacity of the inline booster pump station at Stanger Tanks restrict the total capacity that can be supplied to the Mvoti Balancing Reservoir. Hence, the intention is to construct a second pipeline between Honolulu Reservoir and the Mvoti Balancing Reservoir to be able to increase the capacity of this link. The additional capacity will only be available to supply the Mvoti Balancing Reservoir once the upgrades are also implemented.
A feasibility study of the Lower Thukela BWSS ( Section 4.4.1 ) is currently being undertaken. This project will supply potable water southwards and link in to the Mvoti Balancing Reservoir. With the increasing demands predicted for the North Coast, the intention is to augment the supply from Hazelmere Dam into the North Coast Supply System from the Lower Thukela BWSS. Potable water from this scheme will be conveyed as far as Ballito to augment the existing supply from Hazelmere WTP ( Section 5.5 ). Hence, the new Honolulu to Mvoti Balancing Reservoir Pipeline will be constructed with the ability to accommodate bi-directional flow. An inline pump station will be constructed so that supply to KwaDukuza can be initially augmented from Honolulu Reservoir. Once the Lower Thukela BWSS is constructed this pipeline will be reversed to supply water from the Lower Thukela BWSS to the North Coast Supply System.
404
Figure 7.30 General layout of the Honolulu to Mvoti Balancing Reservoir Pipeline.
405 The proposed Honolulu to Mvoti Balancing Reservoir Pipeline is located in the Ilembe District Municipality ( Figure 7.31 ).
Key information on this project is summarised in Table 7.29 .
Table 7.29 Project information: Honolulu to Mvoti Balancing Reservoir Pipeline.
Project 7.1 km long, 800 mm diameter steel pipeline. Components Booster Pump Station Capacity 85Ml/day
Institutional Arrangements Umgeni Water will own, operate and maintain the Honolulu to Mvoti Balancing Reservoir Pipeline and will sell potable water from this pipeline to the Ilembe District Municipality as per the Bulk Water Supply Agreement.
Beneficiaries The Honolulu to Mvoti Balancing Reservoir Pipeline will initially supply water to the KwaDukuza Local Municipality and in particular to the town of KwaDukuza. Once the Lower Thukela BWSS is constructed the pipeline will also supply water south from the Mvoti Balancing Reservoir to the KwaDukuza Municipality areas to the south of KwaDukuza town and ultimately the northern areas of eThekwini Municipality.
Implementation Construction of the pipeline is underway. The project completion date is estimated at November 2011. The total cost of the project is estimated to be R 77.3 million at 2010 prices.
406 7 . 7 . 4 LLL OWER TTT H U KEK E L A BBB ULK WWW ATER SSS UPPLY SSS CHEME
Planning No. 204.19 Project No. UI0302A Project Status Preliminary Design (as at January 2011)
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 7.32). 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 7.31 .
Table 7.31 Project information: Lower Thukela BWSS.
Project • Weir and 110 Ml/day abstraction works on the uThukela River. Components • De-silting works. • WTP initially sized to 55 Ml/day and ultimate 110Ml/day. • Pump stations and bulk supply pipelines to deliver water from the WTP to Mandini Municipality and KwaDukuza Municipality. Capacity Initial Capacity 55Ml/day Ultimate Capacity 110 Ml/day
Institutional Arrangements 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.
407
Figure 7.31 General layout of the Lower Thukela BWSS.
408 Beneficiaries The beneficiaries of this scheme will be the town of KwaDukuza and the areas of the Upper 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.
Implementation The preliminary design of the Lower Thukela Bulk Water Supply Scheme is nearing completion. The design of the scheme will be undertaken immediately thereafter. Construction of the project will be scheduled to match water requirements in the region. The total cost of the project (ultimate capacity) is estimated to be R 1 000 million at 2010 prices.
409 7 . 7 . 5 MMM APHUMULOA P H U M U L O BBB ULK WWW ATER SSS UPPLY SSS CHEME
Planning No. 204.22 Project No. UI0307A / UI0307B / UI0307C / UI0307D / UI0308A Project Status PH1.1a Construction (as at January 2011) PH 1.1b Construction (as at January 2011) PH 1.2 Design (as at January 2011) PH 1.3 Design (as at January 2011) PH 2 Design (as at January 2011)
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 Imvtushane 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 project will initially entail the construction of a run-of-river abstraction works on the Imvutshane River and 6 Ml/day WTP. Potable water will be pumped from the WTP to initially supply Maphumulo and its surrounding areas (PH 1.1a and PH 1.1b). Additional phases will link this infrastructure to Maqumbi and Ashville (PH 1.2 and PH 1.3 respectively). Phase 2 of the project will be the construction of the Imvutshane Dam on the Imvutshane River (Figure 7.33).
Key information on this project is summarised in Table 7.32 .
Table 7.32 Project information: Maphumulo BWSS.
Project Phase 1: Components An abstraction works on the Imvutshane River (PH 1.1a). A raw water pipeline and 6 Ml/day WTP (PH1.1a). Pump stations and potable water supply pipelines to Maphumulo (PH 1.1b), Maqumbi (PH 1.2) and Ashville (PH 1.3).
Phase 2; 3.2 million m 3 Imvutshane Dam Upgrade of the WTP. Capacity Phase 1: 6Ml/day Phase 2: 12Ml/day
Institutional Arrangements 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.
410
Figure 7.32 General layout of the Maphumulo BWSS.
411 Beneficiaries The Maphumulo BWSS will supply both rural and peri-urban settlement areas. The immediate demand that will be satisfied by the Maphumulo BWSS is presented in Table 7.33 .
Table 7.33 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 The construction of PH1.1a is underway and is due for completion in May 2011. The construction of the pipelines and pump stations to supply water to Maphumulo (PH 1.1b) are expected to be completed in September 2011. The design of the Imvutshane Dam is currently underway and construction of the dam and the pipelines of PH 1.2 and PH 1.3 is planned for completion within the next four years. The total cost of Phase 1 of the project is estimated to be R 224 million at 2010 prices. The total cost of Phase 2 of the project is estimated to be R 136 million at 2010 prices.
412 7 . 7 . 6 OOO ZWATHINIZ W A T H I N I BBB ULK WWW ATER SSS UPPLY SSS CHEME
Planning No. 204.17 Project No. UI0310A Project Status Preliminary Design (as at January 2011)
Project Description Communities within the Ozwathini area are currently supplied with water from a number of small borehole and run-of-river schemes. These schemes are proving to be problematic and unsustainable. The long-term solution that has been proposed for this region is to extend the existing Wartburg pipeline to serve this region. However, current levels of water demand in the area do no yet warrant the implementation of this project and a short to medium- term solution has been developed.
The proposed Ozwathini Bulk Water Supply Scheme project is located in the Umgungundlovu and Ilembe district municipalities ( Figure 7.34). The scheme will consist of a dam on the Sikoto River (a tributary of the Mvoti River), a raw water pump station and rising main to a 6 Ml/day WTP and a further pump station and rising main to supply potable water to the existing Nondobula Reservoir. From there potable water can be reticulated through existing networks to the various communities within Ozwathini.
Key information on this project is summarised in Table 7.34 .
Table 7.34 Project information: Ozwathini BWSS.
Project 5.5 million m 3 Sikoto Dam Components Pump station and 2.5 km raw water rising main 6 Ml/day WTP Pump station and 2.5km potable water rising main Capacity 6Ml/day
Institutional Arrangements Umgeni Water will own, operate and maintain the infrastructure of the Ozwathini BWSS and will sell potable water from this system to the Ilembe District Municipality as per the Bulk Water Supply Agreement.
Beneficiaries The Ozwathini Bulk Water Supply Scheme will supply the rural communities of Ozwathini. Over 60 000 people will be supplied from this scheme.
Implementation The detailed feasibility study of the Ozwathini Bulk Water Supply Scheme has recently been completed. The detailed design of scheme is expected to commence in the near future. The construction of the scheme is planned for 2013 to 2015. The total cost of the project is estimated to be R 149 million at 2010 prices.
413
Figure 7.33 General layout of the Ozwathini BWSS.
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417 AAA CKNOWLEDGEMENTS
Umgeni Water’s comprehensive 2010 Infrastructure Master Plan has been updated and improved to produce this 2011 version. The concerted effort of the Planning Services Department as a whole in producing this document is acknowledged and appreciated. Specific contributions by the various team members deserves acknowledgement: Alka Ramnath’s (Planner) contribution in managing the entire project process, writing Section 2 of this report, preparing a number of the maps and in compiling and editing the two volumes, was substantial. Without such valuable input the project would just never get completed. Kevin Meier, Mark Scott, and Gavin Subramanian (Planning Engineers) updated the various components relating to the water supply infrastructure plans and projects within the North, South and Central, and Inland regions respectively. Zanele Mbense (Technician) assisted them with updating the data for the infrastructure tables and compiling the supply footprint map. Sandile Sithole (Hydrologist), supported by Sakhile Hlalukane (Assistant Hydrologist), and Graham Metcalf (Geohydrologist) updated the various sections relating to the water resource regions in Volume I. Mark Summerton (Planning Analyst) revised the section on climate change and also prepared most of the maps. David Stephen (Planning Engineer) once again took on the onerous task of proofreading the report, and Thembi Sibiya (Administrator) kept the department functioning smoothly throughout the project.
The 2011 Infrastructure Master Plan was not completed by the abovementioned people without the valued assistance of numerous other staff members within Umgeni Water. Their contributions are gratefully acknowledged. Operations Division staff provided assistance in updating and confirming infrastructure information. A special word of thanks is extended to Gordon Borain (Manager-Production) for updating Section 6 on the Wastewater Works. The Water and Environment Department kindly provided updated information on water quality within the various water resource regions in Section 3, and Process Services supplied the process and treatment details for each of the water treatment plants in Section 5.
Steve Gillham, PLANNING SERVICES MANAGER
418