The Extreme Precipitation Analysis Tool, EPAT, was developed by HDR Engineering Inc., HDR, a Denver engineering firm with the assistance of the Colorado Division of Water Resources. It uses Probable Maximum Precipitation (PMP) estimates to determine what volume of water the spillway and other relevant parts of a dam ought to be able to handle in a given watershed and location.

"...Extreme Precipitation Analysis Tool (EPAT)...has evolved into a Colorado state standard for developing Probable Maximum Precipitation (PMP) rainfall fields for rehabilitation and sizing of high country dams. Interest in EPAT as a new extreme precipitation analysis standard has spread into New Mexico with strong interest brewing in Wyoming and Arizona."[1]


  1. Quotation from About HDR Atmospheric Science Group

External links and further readingEdit

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