Abstract
Probable Maximum Precipitation (PMP) is a characterilltic of rainfall at a station that ia crucial in designing water impounding structures. Two alternative methode of its computation are described and compared with the statilltical-empirical technique due to Hershfield, generally used in India. One method is baaed on the Gumbel distribution, whilst the other is a modified version of the Hershfield technique. Both alternative methods are more objective and the atatiatical method admits direct interpretation. The currently used method appears to give an overestimate of PMP in all regions of India except the eouthern part.
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