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In September 2013, Coloradoans were reminded of the power of nature during a multi-day rainfall event. Communities along Big Dry Creek experienced significant damage to road infrastructure, businesses, homes, and agricultural lands.
The National Oceanic and Atmospheric Administration’s National Weather Service Hydromete- orological Design Studies Center (HDSC) devel- oped maps showing annual exceedance probabilities (AEPs) of the worst case rainfall for the Colorado event that started on September 9, 2013. The AEP is the probability of exceeding a given amount of rainfall at least once in any given year at a given location. It is an indicator of the rarity of amounts of rainfall and is used as the ba- sis of hydrologic design and regulation. The multi-day storm event delivered total rainfall amounts that exceeded 15 inches in some locations as it slowly moved through the area and caused extensive river flooding (HDSC 2013).
More South Platte River Basin coverage here.