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<br />CDM. <br /> <br />-.CAMP DRESSER & McKEE INC, <br /> <br />environmental engineers, scientists, <br />planners, & management consultants <br /> <br />March 31, 1981 <br /> <br />~~rrJ~1t'W~~ <br />1. APR 01 1981 <br /> <br />Writer's Tower, Suile 1100 <br />1660 South Albion Street. DenV8f.-Colofado 80222 <br />303758.4351 <br /> <br />/) <br />V <br /> <br />'ihrfO <br /> <br /> <br />Dr. John Li ou <br />FEMA <br />Denver Federal Center <br />Building 710 <br />Lakewood, CO 80225 <br /> <br />\"..v......... <br />CONSERVATION BOARD <br /> <br />Dear John, <br /> <br />CDM has completed a review of the Army Corps of Engineers hydrologic <br />analysis of ~~curitv andJLi~efield creeks and Windmill Gulch in El <br />~J ;-paso County~-Cblorado. The analysis reviewed is com:a1ned in the <br />"p'1klt/ 1976 COE Report on Hydrologic Investigations for Flood Insurance <br />~cl( 'IV (J.., 'Studies in Colorado Springs and El Paso County, Colorado, This <br />r,(?V ~~ lreport has been reviewed and summarized for FEMA in COM's Hydrologic <br />~:7' Review submitted to FEr1A in December, 1980. <br /> <br />The hydrologic methods used to predict the peak flow rates for the <br />10-, 50~, 100- and SOD-year frequencies consisted of TM-l in the <br />undeveloped portions of each basin, and a unit hydrograph techni- <br />que in developed portions of each basin. The synthetic unit hydro- <br />graph method was applied in each urbanized sub-basin and the re- <br />sulting storm hdyrographs were routed through these basins via the <br />historic drainage channels. Field reconnaissance carried out at <br />the outset of the Flood Insurance Study for El Paso County revealed <br />no changes in urbanization from the basin(s) conditions at the <br />time of the COE work. A detailed description of the methodology <br />is contained in the COE report. Table 1 summarizes the peak flow <br />rates for Security and Widefield creeks and Windmill Gulch at <br />specific locations along each stream. These flows are recommended <br />for use in the hydraul ic review and analysis of each of these creeks. <br /> <br />If you have any questions, please feel free to contact me as soon <br />as possible. <br /> <br />Very truly yours, <br /> <br /> <br /> <br />R chard N, Wray <br />Project Manager <br /> <br />~{c: Gene Jencsok,CWCB <br /> <br />RNW/sw <br />