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Résumé :
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National Oceanic and Atmospheric Administration Technical Paper-29, published in the late 1950s, remains the most commonly used reference for estimating extreme areal precipitation from station data in the United States. Although a number of alternative methods have been proposed over the intervening years, a rigourous evaluation of the assumptions used in the compilation of TP-29 has not been presented. Overall, TP-29 areal reduction factors, are in close agreement with the TP-29 values. For larger watersheds, which TP-29 does not address, the areal reduction factors continue to decay exponentially. The Areal reduction factors were found to be particularly sensitive to return period and season, with less extreme areal precipitation relative to the corresponding station precipitation at longer return period and season. The Reevaluated factors exhibit modest differences between study areas in North Carolina and New Jersey. The Influence of station density, interpolation method, and topographical rainfall biases appears insignificant.
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