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. . United States Department of the Interior GEOLOGICAL SURVEY Denver Federal Center Denve~ Colorado 80225 m REPLY REFER TO: Water Resources Division Colorado District March 12, 1973 Mr. Felix L. Sparks, Director Colorado Water Conservation Board 102 Columbine Building 1845 Sherman Street Denver, Colorado 80203 I?rn,,/ I.:(,C'0 1.f.4/f to 12 Co",;':,:) ,,_ 19/:) ....,No'.. ""o1'r€", "/ii-""I1,'l;,!1 'v'rlJ. o~Ro Dear Mr. Sparks: ''''^'''' I am enclosing a press statement and a copy of the report entitled, "Rainfall-Runoff Data from Small Watersheds in Colorado, June 1968 through September 1971," by G. Louis Ducret, Jr. and Harold Hodges. An additional 75 copies have beende1ivered to your office for use in handling requests. The magnitude and frequency of peak discharges must, of course, be considered in the design of storm drainage systems and structures. The U.S. Geological Survey in cooperation with the Colorado Department of Highways and the Urban Drainage and Flood Control District is conducting studies in which rainfall-runoff data from small watersheds are being collected and analyzed to estimate the."meanannual flood and floods of other frequencies for drainage basins in Colorado. Data are being collactedon 30 drainage basins that range from about 40 acres to about 1.5 square miles in the Denver metropolitan area and On 43 rural basins in eastern and southwestern Colorado that range in size from about 1 to about 25 square miles. These 73 sites cover a broad range of basin characteristics in the rural and urban environment. The report, Colorado Water Conservation Board B~~;~-D~r~ ~~J~~e Jt~. 2Z, has been prepared to inform potential data users of the -rnvestigatioh and to present information on all significant rainfall-runoff data that have been collected from the beginning of the study in June 1968 to the end of the 1971 storm season. Sincerely yours, <t? II #~. ti: U.~r Acting Dis ict Chief Enclosures