Evaluation of probable maximum precipitation

Abstract
Probable maximum precipitation is defined and a distinction is drawn between it and probable maximum storm. The maximizing procedure used in the derivation of probable maximum precipitation for specific areas consists chiefly of moisture adjustment and, when justifiable, transposition of observed storms. Moisture adjustment of a storm involves the estimation of the increased precipitation that would be expected if maximum atmospheric moisture were available. Transposition involves the adjustment of the precipitation of storms observed outside the problem area for differences in meteorological and topographic effects between their original sites and the problem area. It is in effect an extrapolation of the record of storm experiences for the area.

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