Polihali Dam Tender

Scope Construction of the Polihali Dam. The Polihali dam will be built downstream of River Seqhu and River Khubelu. The dams 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 5053 hectares and a total storage capacity of 2325 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. Two tunnels are already under construction to supply the Polihali dam.Work on the dam design commenced in 2017 and tender design is expected to be completed during 2019. Construction is expected to start in 2020 with completion and commissioning expected in 2026.