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STATEMENT: Restoration of Nagle Dam-Durban Heights Water Treatment Works Aqueduct 1 and Aqueduct 2
Wednesday, 19 October 2022
Work is progressing according to schedule with repair and restoration of the Nagle Dam-Durban Heights Water Treatment Works Aqueduct 1 and Aqueduct 2, both of which were extensively damaged in the April 2022 floods.
A significant amount of work has already been completed on Aqueduct 1 and full restoration is due by 22 December 2022, in line with timelines provided by the contractor and agreed to by uMngeni-uThukela Water. When work is completed, the process of testing and commissioning of the aqueduct will begin. If all goes according to plan, raw water will begin flowing immediately after commissioning for treatment at the Durban Heights Water Treatment Works. Aqueduct 1 will bring an additional 100Ml/d raw water into the system. Work on Aqueduct 2 is due for completion in June 2023, after which testing and commissioning will occur.
The extent of storm damage to these aqueducts was vast. They broke completely at six places in Wushini, Inanda, and had to be decommissioned. Restoration will involve replacing the broken pipes with new steel pipes, which have already arrived at the contractor’s base at Inanda Dam. They were manufactured in Johannesburg.
Last week the Maphephetheni Water Treatment Works in Kwa Ngcolosi, Inanda, was shutdown down for two days for floor repairs on Aqueduct 1 and Aqueduct 2, electromagnetic scanning of Aqueduct 2 Siphon 8 and visual assessment of Aqueduct 1 Siphon 8. Scanning and assessment of these pipes revealed what other parts in them have to be replaced. This exercise was successfully concluded and the Maphephetheni Water Treatment Works is back to full production.
Aqueduct 1 and Aqueduct 2 are among four aqueducts that convey raw water from Nagle Dam to the Durban Heights Water Treatment Works for treatment and supply to eThekwini Metro. The treated water is supplied to areas in the north, south, central and inner west Durban.
Decommissioning of Aqueduct 1 and Aqueduct 2 caused a deficit in raw water that, in turn, resulted in reduced volumes of drinking water being supplied to the municipality. To augment raw water resources, uMngeni-uThukela Water has brought into use three emergency shaft pumps, and intermittently uses the fourth, to transfer raw water from Inanda Dam to the Durban Heights Water Treatment Works. Additional small amounts of raw water are being put into the other two functioning Nagle Dam-Durban Heights Water Treatment Works aqueducts.
These augmentation measures have resulted in a steady decrease in deficit, both of raw water and potable water.
Issued by the Corporate Stakeholder Management Unit Office of the Chief Executive, uMngeni-uThukela Water
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