Abstract
In South Africa, the properties of rainfall can be expressed as a simple scaling formula: Pd,T = αP1day,2[1 + βyT] d1-η, a product of three factors: the median one-day rainfall, a function of location; a function of the return period; a power function only of duration. It is shown that the area reduction factor in South Africa is constant for storm duration equal to the time of concentration. These facts extend the usefulness of the Rational Formula to larger areas than commonly accepted. Corroboration is made against Regional Maximum Flood data.
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