Updating PMP to provide better dam and spillway design

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Abstract
Probable Maximum Precipitation (PMP) is used as input to derive the Probable Maximum Flood (PMF) for high hazard dams across the United States. The PMF is used to design high hazard dams to ensure they do not overtop and fail during a PMP/PMF event. PMP values were developed for most of the United States by the National Weather Service (NWS) in a series of Hydrometeorological Reports (HMRs) starting in 1940 and continuing through 1999. However, the NWS stopped updating the HMRs and the storms used to derive the PMP values. Since that time the meteorological understanding of extreme rainfall has ...
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