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<br />current developed conditions with Chatfield Dam in place, <br /> <br />Coincidently. they also match fully developed (1990) conditions <br /> <br />as presented in the Corps' Report entitled "Metropolitan Denver <br /> <br />and South Platte River and Tributaries Vol. V Appendix <br /> <br />H-Hydrology dated January 1980," They are compared to values <br /> <br />developed by Merrick & Company for the Urban Drainage and Flood <br /> <br />Control District in an effort to show consistency, The main <br /> <br />difference between Corps' Values and Urban Drainage Values is <br /> <br />the assumed release from Chatfield during a lOO-year flood <br /> <br />event. Urban Drainage assumed no releases from Chatfield <br /> <br />during 100-event. while the Corps assumed a maximum release of <br /> <br />5000 cfs and attenuated it downstream. Please note that the <br /> <br />discharges used in several flood insurance are not clearly <br /> <br />indicated and thus several phone calls and a search of records <br /> <br />were necessary to verify values used, <br /> <br />Table 2 <br /> <br />100-year Discharges on the South Platte river in Arapahoe <br /> <br />County. Colorado, <br /> <br />Reach: Confluence Bear Creek to confluence Dutch Creek <br /> <br />Location <br />Upstream of <br /> <br />Corp/FEMA 1] <br />11.500 cfs <br /> <br />UD&FCD_2] <br />3.500 cfs <br /> <br />Assumed <br />Release <br />Attenuated <br />5000 cfs <br /> <br />Total 3] <br />B,500cfs <br /> <br />Dutch Creek <br /> <br />Downstream of <br /> <br />12.500 <br /> <br />6.500 <br /> <br />5000 <br /> <br />11,500 <br /> <br />Dutch Creek <br /> <br />n5_ <br />