- The Lesotho Highlands Development Authority (LHDA) has launched tender for construction of the Polihali Dam.
- The authority is seeking a company to develop the water reservoir and is targeting both national and international companies.
- Deadline for submissions is 12 November 2021.
“Our objective with this latest development is to attract suitably qualified companies with the capacity, experience and resources to undertake the construction of the Polihali dam within the set time frame and with the required quality,” said Tente Tente, LHDA’s managing director.
The Polihali dam will be built downstream of River Seqhu and River Khubelu. The dam’s concrete rockfill wall will be 165m high with a ridge length of 921m and a ridge width of 9m. At its base, the slope will be 470m wide. The dam will have an overflow with a concrete side channel overflow.
According to LHDA, approximately 13 million cubic metres of rock will be extracted from the dam site and compacted for back fill construction. The Dam will form a reservoir on the Orange River and Hubeilu River, with an area of 5,053 hectares and a total storage capacity of 2,325 million cubic meters. It will be supported by a saddle dam, an auxiliary reservoir built to contain the reservoir created by a primary dam.
Polihali Dam is part of Phase II of the Lesotho Highlands Water Supply Project. It is a programme to build several dams in Lesotho to capture the waters of the upper Orange River Basin and reverse part of its flow in order to provide South Africa, and in particular the Johannesburg region, with drinking water.
Link to tender documents HERE
Author: Bryan Groenendaal