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<br />area. Until recently, the First Creek and First Creek Tributary <br />flaadplains were entirely agricultural. <br /> <br />Na specific infarmatian regarding histaric flaad magnitudes .or <br />extent .of flaading and damages is available far Caan Creek, <br />Lakewaad Gulch, West Harvard Gulch, . and Dry Gulch (Harvard Gulch <br />Tributary) . <br /> <br />2.4 Flaad Pratectian Measures <br /> <br />.. <br /> <br />There are numerous dams, <br />within the Sauth Platte <br />pratectian measures affect <br />flaw thraugh Denver. <br /> <br />reservoirs, and channel <br />River Basin. Many .of <br />flaad peaks an the flaading <br /> <br />improvements <br />these flaad <br />saurces that <br /> <br />In additian ta an active flaadplain management pragram, the majar <br />flaad pratectian measures, by basin, are listed belaw: <br /> <br />Sauth Platte River <br /> <br />The Chatfield Dam and Lake alang the Sauth Platte River were <br />autharized far canstructian by the 1950 FlaadCantral Act. The dam <br />is lacated an the Sauth Platte River just dawnstream fram the mauth <br />.of Plum Creek, sauth of Denver. The reservair has a stOrage <br />capacity .of 385,000 acre-feet, including 215,000 acre.feet far <br />flaad starage and 20,000 acre-feet far sediment cantral. The <br />praject pravides a high degree .of pratectian far metrapalitan <br />Denver and far extensive agricultural lands dawnstream <br />(Reference 4). <br /> <br />Clear Creek <br /> <br />There are 11 majDr reservDirs in the lDwer Clear Creek basin, 3 .of <br />which, RalstDn ReservDir, Maple GrDve ReservDir, and Leyden Lake, <br />are .on-stream and prDvide SDme residual flDDd cDntrDl effects dDwn- <br />stream frDm each site. NDne .of these reservDirs has a specific <br />flDDd cDntrDl functian. <br /> <br />. <br /> <br />RalstDn ReservDir, lDcated west .of Denver and nDrthwest .of the City <br />.of GDlden, was built .in 1938 by the City and CDunty .of Denver. It <br />receives water frDm RalstDn and SDuth BDulder Creeks and is used <br />fDr municipal water supply. The .outlet wDrks deliver water tD the <br />Maffat Treatment Plant and have the capability .of fDrcing the <br />natural inflDw back intD Ralstan Creek. AlthDugh RalstDn ReservDir <br />is nat .operated far flD.Dd cDntrDl purpDses, there' is apprDximately <br />2,400 acre-feet .of stDrage available between the primary spillway <br />crest at elevatiDn 6,046.0 feet and the tDp .of the dam at elevatian <br />6,060.0 feet. This stDrage prDvides incidental flDDd cDntrDl. <br /> <br />. <br /> <br />Maple GrDve ReservDir, which is lDcated .on Lena Gulch in the City <br />.of LakewDDd, is .owned by CDnsDlidated Mutual Water Campany and is <br />used fDr municipal water-supply stDrage. The reservDir prDvides <br />SDme attenuati.on .of flaDd peaks. Appr.oximately 452 acre-feet .of <br /> <br />11 <br />