Rainfall Intensities in the Conterminous United States and Hawaii.
ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA
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The report and sections of Report No. 4 of the series Studies of Army Aviation VSTOL Environment entitled Distribution of Mean Monthly Precipitation and Rainfall Intensities ETL-SR-72-5 present maps of the distribution of rainfall intensities for durations of 5, 30, and 60 minutes and return periods of 10, 25, and 100 years within the conterminous United States and Hawaii. The 5-minute values displayed on the maps were derived from existing 30-minute maps by multiplying the 30-minute values by a constant 0.37 and interpolating between isohyets. To provide a check on the foregoing method, data for excessive precipitation from 54 U.S. weather stations were subjected to extreme value analysis, and 5-minute amounts were obtained for the various return periods.