oa Civil Engineering = Siviele Ingenieurswese - Hydrological research in South Africa and its importance to the future development of the country
A few figures are enough to demonstrate the significant economic benefits that can result from even a small improvement in exploiting rainfall. In Cape Town's Wemmershoek catchment the rainfall during the reservoir's hold-over period, a three dry-year cycle, is estimated at about 60 in. The available run-off for supply however is only 25 in. Approximately 35 in. are lost by evaporation and transpiration, and possibly percolation. To obtain the 25 in. of yield, an expenditure of 8,000,000 was incurred, i.e. about 300,000 per in.
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