Taking on the challenges of water resources assessment

Abstract

I t is well known that water is South Africa’s scarcest resource, and that the country counts among the world’s 30 most parched. With an average annual rainfall of only around 465 mm a year (about half the world’s average) and a concomitant high evaporation rate, South Africa has a total mean annual runoff of less than 50 000 million m3/a – only 50% of the mean flow of the Zambezi River.

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