oa Civil Engineer in South Africa - Surface water resources of South Africa - the 1981 appraisal
Nearly all of South Africa's water requirements are drawn from surface resources. It is generally accepted that demand will exceed the exploitable resources within the next 40 years. A reliable means of evaluating surface water resources is therefore essential to planners, designers and managers of water supply schemes.
This paper discusses the problems involved in a country-wide appraisal of surface water resources, with reference to a recently undertaken survey of South Africa. The paper describes how spatial and temporal extrapolation of stream flow observations was accomplished with the aid of a deterministic rainfall-runoff model which takes into account landuse changes. Also described are the techniques employed for statistical analysis of low records to provide information for determination of storage yield at virtually any locality in the country. Some results of the new water resources survey are presented.
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