Probable maximum precipitation estimates for the drainage above Dewey Dam, Johns Creek, Kentucky

This report discusses estimates of probable maximum precipitation (PMP) for the drainage of Johns Creek, Kentucky above Dewey Dam. Estimates are given for durations from 1 to 72 hr for the drainage which is partly within a stippled region identified in Hydrometeorological Report (HMR) No. 51, thereby necessitating evaluation of terrain effects on precipitation. Part of the procedure used to evaluate terrain effects required selection of proxy observations of precipitation since there were no reporting locations within the drainage. The remainder of the terrain evaluation procedure was the same as the one reported earlier in NOAA Technical Memorandum NWS HYDRO 39. As in the earlier report, the applications procedures of HMR No. 52 were used along with generalized PMP estimates from HMR No. 51 to obtain a drainage average depth of nonorographic PMP. The final, or total, PMP estimates are the products of the drainage average depth of nonorographic PMP and the orographic intensification factor representing the evaluation of terrain effects within the drainage. D.D. Fenn. Includes bibliographical references (pages 32-33). 1985 NWS (National Weather Service) Library Public Domain 1931