Vaal Dam is situated on the elevated plateau which forms the interior of South Africa and is a little less than 1500 m above the level. The source of the most of the streams and rivers flowing into the dam are about 2000 m above sea level, though some of them flow more than 300 km before reaching the impoundment.
Reference:
Chutter, FM. 1970. Hydrobiological studies in the catchment of Vaal dam, South Africa. Part 1. River Zonation and the Benthic Fauna. Internationale Revue der gesamten Hydrobiologie und Hydrographie, Vol. 55(3), pp 445-494
Chutter, F. (1970). Hydrobiological studies in the catchment of Vaal dam, South Africa. Part 1. River Zonation and the Benthic Fauna. http://hdl.handle.net/10204/4882
Chutter, FM "Hydrobiological studies in the catchment of Vaal dam, South Africa. Part 1. River Zonation and the Benthic Fauna." (1970) http://hdl.handle.net/10204/4882
Chutter F. Hydrobiological studies in the catchment of Vaal dam, South Africa. Part 1. River Zonation and the Benthic Fauna. 1970; http://hdl.handle.net/10204/4882.
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