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<br />individual is familiar with the derivation of hypothetical storms, the potential exists to <br />perform many of the calculations with HEC-1. The current version of the computer <br />program can develop the SPS and PMS for areas east of the 105th meridian, with the <br />user-supplied point rainfall index and shape factor. The latest version of HEC-1 <br />incorporates procedures for the development of annual-series hypothetical-frequency <br />storms for the user-supplied point rainfall depth-duration array, Adjustments for depth, <br />area, and annual series are made automatically, incremental depths are determined, and <br />the entire storm pattern is arranged within the program, <br /> <br />FURTHER SUGGESTED READING <br /> <br />Technical Memorandum NWS HYDRO-35, 19n. "Five to 60 Minute Precipitation <br />Frequency for the Eastern and Central U.S." <br /> <br />NWS TP 40,1961. "Rainfall Frequency Atlas of the United States, 30-minute to 24-hour <br />Durations, 1 to 100 Year Return Periods." <br /> <br />NWS TP 49, 1964. "Two to Ten Day Precipitation for Return Periods of 2 to 100 Years <br />in the Contiguous United States." <br /> <br />NOAA Atlas 2, 1973. "Precipitation Frequency Atlas of the Western United States," <br />Volumes 1-13. <br /> <br />EM 1110-2-1411, "Standard Project Flood Determination," revised March 1965. SPS <br />procedures for the eastern and central U.s. East of 1050 longitude and for basins less than <br />1000 square miles. <br /> <br />HMR 33 "Seasonal Variation of Probable Maximum Precipitation (PMP), East of the 105th <br />Meridian for Areas 10 to 1000 Square Miles and Durations of 6 to 48 hours, "1956. <br />Applies to areas east of the Rockies. <br /> <br />TP 38, 1960. "Generalized Estimates of PMP for the U.S. West of the 105th Meridian for <br />Areas Less Than 400 Square Miles and Durations to 24 Hours," <br /> <br />HMR 43, "Probable Maximum Precipitation, Northwest States," June 1965. Estimates of <br />PMP for durations of 1 to 72 hours for basins from 10 to 5,000 square miles west of the <br />Cascade Divide and 10 to 1000 square miles east of the divide in the Columbia River <br />Basin. <br /> <br />HMR 49, "PMP Estimates, Colorado and Great Basin." Covers areas of California, <br />Nevada, Utah, Arizona, Wyoming, Colorado and New Mexico for durations of 15 minutes <br />to 6 hours and areas from 1 to 500 square miles. <br /> <br />HMR 51, 1974. "Probable Maximum Precipitation Estimates, United States East of 105th <br />Meridian," <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />DRAFI' <br /> <br />7.11 <br />