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However ...The Sterkfontein Dam, located just outside the town of Harrismith, in the Free State, province of South Africa, is part of the Tugela-Vaal Water Project, and located on the Nuwejaarspruit, a tributary of the Wilge River in the upper catchment area of the Vaal River.
So it was above the Wilge and got it's water pumped to it from other rivers.The dam receives its water via the Tugela-Vaal Project which is a pumped-storage scheme involving the net transfer of up to 630 million m3 of water from KwaZulu-Natal. This is stored in Sterkfontein Dam and released to Vaal Dam via the Wilge River when needed.
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