Original Research

Water availability and demand in the humid and arid regions within development regions of South Africa

A. B. de Villiers, L. A. van Wyk, W. Viviers
Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie | Vol 8, No 1 | a862 | DOI: https://doi.org/10.4102/satnt.v8i1.862 | © 1989 A. B. de Villiers, L. A. van Wyk, W. Viviers | This work is licensed under CC Attribution 4.0
Submitted: 14 March 1989 | Published: 14 March 1989

About the author(s)

A. B. de Villiers,, South Africa
L. A. van Wyk,, South Africa
W. Viviers,, South Africa

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Abstract

A method has been developed to distinguish between water supply and demand in individual development regions which contain distinct humid and arid to subarid areas. Development regions A and D have heterogeneous climatic distributions within their borders and are dealt with in this regard. These regions can be divided into arid and humid areas. A magisterial district was considered to be humid when the average annual rainfall is more than 400 mm over more than 50 percent of its total area. The water availability and demand for each of the districts (whether humid or arid) were calculated on a pro rata basis according to the area each district occupies within the various secondary drainage basins. The results obtained in this study show great promise to divide the regions into arid and humid areas for more accurate and detailed planning within the development regions.

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