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<br />Dr. John LiO' <br />March 17, 1981 <br />Page Two <br /> <br />. <br /> <br />CAMP DRESSER & McKEE INC, <br /> <br />Inf">rmation <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 Jimmy <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 />~I<:;' CaE Report on Hydrologic Investigations and a 1979 Master Drain- <br />",Cl' age Study prepared for the City of Colorado Springs The 1976 <br />CDV FP'R 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 the COE work and has not used the report for <br />floodplain management and regulation. The hydrologic results of <br />the 1976 CaE Hydrologic Investigations and the 1979 Cottonwood <br />Creek Drainage Study compare closely (less than 5 percent <br />d9viation). COM recommends that the results obtained for <br />Cott0nwood Creek in the 1976 CaE 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 />Should you have any questions concerning the hydrologic analyses <br />discussed, please contact us. The peak flow rates shown in <br />Table 1 wil I be used in the hydraulic analysis of these creeks. <br /> <br />Very truly yours, <br /> <br />CAMP DRESSER & <br /> <br /> <br />N. Wray <br />Manager <br /> <br /> <br />RNIi/ps <br />Enclosure <br /> <br />cc: Gene Jencsok, CWCS <br />