oa Civil Engineering = Siviele Ingenieurswese - Thune Dam potholes : geotechnical engineering

Volume 20, Issue 3
  • ISSN : 1021-2000



The government of Botswana in recent years has undertaken major dam construction to address the rapidly growing demand for water. This culminated in the construction of three major dams with a combined capacity of about 530 million m3, almost doubling existing surface water capacity to 939 million m3. Construction of the Dikgatlhong Dam commenced in March 2008, followed by the Lotsane Dam in April 2009 and the Thune Dam in April 2010. Dikgatlhong and Lotsane Dams are substantially complete. Dikgatlhong is the largest dam in Botswana with an active capacity of 400 million m3, while the Thune Dam, which is still under construction, will be the fourth largest dam, with a full supply capacity of 90 million m3 upon completion. During excavation of the cut-off trench, potholes were encountered. The occurrence, intensity and size of these potholes puzzled many, and various theories were postulated on the origins of these potholes.

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