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<br />" <br /> <br />Dr. John Lit <br />March 17, 1981 <br />Page TIm <br /> <br />. <br /> <br />CAMP DRESSER & McKEE INC. <br /> <br />Information <br />adopted for <br />Camp Creek. <br /> <br />Report and the 1975 SCS Flood Hazard Analysis be <br />use in the current Flood Insurance Study of Jim~y <br />The recommended flow rates are shown in Table 1. <br /> <br />The reports reviewed by COM for Cottonwood Creek include the 1976 <br />COE Flood Plain Information Report for Cottonwood Creek, the 1976 <br />COE Report on Hydrologic Investigations and a 1979 Master Drain- <br />age Study prepared for the City of Colorado Springs The 1976 <br />FPIR by the Corp of Engineers estimated the peak flow rates for <br />al I frequencies using future development conditions. This is <br />unacceptable for FIS purposes and futher, the City of Colorado <br />Springs rejected i'he COE work and has not used the report for <br />floodplain management and regulation. The hydrologic results of <br />the 1976 COE Hydrologic Investigations and the 1979 Cottonwood <br />Creek Drainage Study compare closely (less than 5 percent <br />deviation). COM recommends that the results obtained for <br />Cottonwood Creek in the 1976 COE Report on Hydrologic Investi- <br />gations for Flood Insurance Studies be used in the current flood <br />insurance study effort. The peak flow rates' for the 10-, 50-, <br />100- and 500-year frequencies are summarized in Table 1. <br /> <br />, I <br /> <br />Should you ~ave any questions concerning the hydrologic analyses <br />discussed, please contact us. The peak flow rates shown in ' <br />Table 1 will be used in the hydraulic analysis of these creeks. <br /> <br />Very truly yours, <br /> <br />C~lP DRESSER & McKEE INC. <br /> <br />Richard N. Wray <br />Project Manager <br /> <br />RNW/ps <br />Enclosure <br /> <br />cc: G8ne Jencsok, CWCB <br />