n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Design and construction of Katse dam : Lesotho Highlands Water Project

Volume 40, Issue 1
  • ISSN : 1021-2019



This paper describes the design of the 185m high double-curvature concrete-arch dam at Katse, the main impounding reservoir for the Lesotho Highlands water project. The £230 million (R1, 61 billion) project involved excavating 1, 3Mm<sup>3</sup> of concrete in just 77 months. In addition to the main dam, the project includes a 500kW mini-hydro plant and a 32m high concrete tailwater dam for the plunge pool. Concerns about the integrity of the basalt lava flows beneath the main dam led to the use of a preformed joint at the base of the dam to limit uplift and a novel system of massive concrete shear keys.

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