There are currently two major dams in Lesotho, Mohale Dam and Katse Dam. These two structures, in conjunction with Matsoku Weir and the transfer tunnels between the two dams and one to South Africa, form Phase 1 of the Lesotho Highlands Water Project. Katse DamKatse Dam is the major dam in the Senqu River catchment, located on the Malibamutso River. Katse Dam is the key to the LHWP and is the highest dam in Africa at 185 m. The dam forms part of the first phase of the LHWP, usually referred to as Phase 1A. It forms the main collecting storage reservoir in Lesotho from which all transfers to South Africa are made through approximately 80 km of concrete-lined tunnels. The reservoir is very narrow, winding and deep, and exposes a surface area of 35,8 km2 at maximum capacity. The total effective storage capacity is 1 520 Mm3. Mohale DamThe Mohale Dam forms the main storage element in Phase 1B of the Lesotho Highlands Water Project (LHWP) and is located on the Senqunyane River immediately downstream of the confluence with the Jorodane River. The dam is approximately 145 m high with a total capacity of 947 Mm³. The catchment area for the dam is 938 km² with a mean annual runoff in the order of 299 Mm³. The dam started to impound water in November 2002. Muela DamThe Muela Dam and Hydropower Plant were completed in Phase 1A of the Lesotho Highlands Water Project. The Muela Dam is a double curvature concrete arch dam with a height of 55m. The Lesotho Highlands Water Project is primarily a water transfer system, but at 'Muela the water en route to South Africa powers an underground hydroelectric power station that generates electricity to supply the needs of Lesotho. Before the station was built, electricity had to be bought from South Africa. Other DamsIn addition to the large dams of the Lesotho Highlands Water Project, there are several other smaller dams in Lesotho, primarily used for municipal water supply. These dams include:
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