imp 2013 vol2 part7dnn

7/21/2019 IMP 2013 Vol2 Part7dnn

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7.6 South Coast System

7.6.1 Nungwane Raw Water Pipeline

Planning No. 302.5

Project No. UI0646A

Project Status Design (as at January 2012)

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 M/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 inTable 7.18.

Table 7.18 Project information: Nungwane Raw Water Pipeline.

Project Components: New 450mm diameter, 14.7km long steel pipeline

Capacity: 20 M/day


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Figure 7.22 General layout of the Nungwane Pipeline.


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Institutional Arrangements

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 two years and is required by the year

2018. Currently the project is at Tender Stage. The total cost is estimated to be R 68.5 million.


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7.6.2 South Coast 2b Kelso to Umdoni

Planning No.

Project No.

Project Status Feasibility (January 2013)

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 (SCP-2b) consists of a 600 diameter pipeline and forms two parts

extending southwards with an approximate length of 6km in total (Figure 7.23). The proposed

pipeline route runs parallel to the N2 highway, deviating from sensitive drainage areas and

vegetation where possible. The first section of SCP-2b will tie into the SCP-2a and lies between

Scottburgh South and Park Rynie. The remainder of the SC-2b pipeline continues from Kelso off-taketo Umdoni Reservoir.

The remainder of the South Coast Pipeline will ultimately be extended from Umdoni to Hibberdene

once the Lower uMkomazi 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

the two schemes will provide a measure of operational flexibility. It will serve as a contingency for

drought situations in either system. The Lower Mkomazi scheme will provide an assured supply of

water to the area without being reliant on the Lower Mgeni System.

Institutional ArrangementsThe bulk supply infrastructure of the Kelso to Umdoni 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 2014.

The total cost is estimated to be R 65 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. UI27

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 M/daySinghs and Clansthal

2 M/dayScottburgh South Reservoir (currently supplied from the SCP-1)

4.5 M/dayKelsoPennington supply off the SCP-2a

4.5 M/daySupplement to the Umzinto WTP only once both new links are installed.

This relates to an AADD of 19.5 M/day. At a peak day factor of 1.25, the immediate peak demand is

estimated at 24.4 M/day. With the current 7.5 M 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 M when the existing 7.5 M reservoir

was constructed, provision was made to construct an additional 7.5 M section attached to the one

wall of the existing reservoir.

It is recommended that an additional 7.5 M reservoir be constructed as laid out in the design of the

existing reservoir (Figure 7.24andTable 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 M


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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 15 million at 2012 prices.


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7.6.4 Ellingham Link

Planning No. 305.13

Project No. UI105

Project Status Design (as at January 2012)

Project Description

The Umzinto WTP is currently sustaining an average daily demand of 9.5 M/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 (Figure7.25). This link

can immediately provide a measure of support of 2 M/day to the Umzinto WTP. This augmentation

can be increased to 4.5 M/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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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 M/day by 58m head, pump

sets (one operating and one standby).

Capacity: 9 M/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. 305.10

Project No. UI0501

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 WTP 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) and then fed into the reticulationsystem 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 stationsat the dam and intermediate booster;

Raw water rising main400mm dia. steel pipeline 2900m lengthWTP4M/day upgradeable to 8M/day,

Potable water pump station,

Potable water rising main350mm dia. uPVC pipeline,

Reservoir2M upgradeable to 4M, and

Potable water gravity main200mm dia. uPVC/steel.

Capacity: 4 M/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 April 2014. The total estimated capital cost for

Phase 1 is R186 million.


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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.


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 andassociated electrical and mechanical works

Balancing tanks / reservoirs

The existing 4 M/day water treatment works is to be

upgraded to an 8M/day plant, which includes a clear-

water pump station

Command Reservoir increase from 2Mto 4Min storage

capacity

Eskom connection/s

Capacity: 8 M/day in total

Implementation

The total estimated capital cost for Phase 2 is R130 million and is currently in the Pre-feasibility

Stage.

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