Causey Dam, Utah 1,000-Year Rainfall-Runoff Report

A research proposal to develop the 1,000-year thunderstorm (local) hydrograph for Causey Dam was submitted and approved by Dam Safety for fiscal year 2002. The study purpose was to use rainfall-runoff modeling procedures to compute both peak discharge and volume amounts. These results were then compared with previous frequency peak estimates at Causey Dam that used peak streamflow discharge estimates and paleoflood information from the Ogden River drainage basin. The study used the National Weather Service (NWS) draft precipitation values for the southwest region that include the 1,000-year return period. Rainfall-runoff modeling was done using these precipitation values to develop the 1,000-year thunderstorm hydrograph for Causey Dam. The thunderstorm event was chosen to eliminate snowfall as a variable in the computation.