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<br />ME1,101- NOV. I, 1939. <br /> <br /> <br />Attl <br /> <br />Clifford H. Stone, Directo~ <br />Colorado Fater Conservation Board; <br /> <br />From <br /> <br />C. L. Patterson, Chief Engineer; <br /> <br />ReI <br /> <br />FLOOD CONTROL ON CHERRY CREEK ABOVE DEW.;a, COLORADO. <br /> <br />These memoranda relate to Cherry Creek, and to the <br /> <br />problems incident to flood control and the reconstruction of the Castle- <br /> <br />wood dro~ as a combined flood control and irrigation project. <br /> <br />DESCRIPTIon OF C;lER.'l.Y CREI:K. <br /> <br />Cherry Creek has its headwater sources in the Black Forest <br /> <br />area on the north slope of the ArkaP~as-South Platte divide. It flows <br /> <br />northerly, parallel to the Front Range of the Rocky Mountains (but <br /> <br />separated therefrom by the adjoining drainage basin of Plum Creek) and <br /> <br />enters the South Platte River in the City of Denver. <br /> <br />The foothill and high plains region of Colorado, east <br /> <br />of the Front Range, including the drainaGe basin of Cterry Creek, is <br /> <br />periodically visited by intense rain-storms of the cloud-burst type. <br /> <br />These create floods characterized ~y high momentary crest flaws of <br /> <br />comparatively short duration and small total volwne. Such floods are <br /> <br />damaging in proportion to property values in the flood plain. They <br /> <br />demand large channel capacities, to prevent overflow of adjoining areas, <br /> <br />but lend themselves readily to control by storage, providing storage <br /> <br />capacities are adequate. otherwise large aIJd e:xpensive spillWays are <br /> <br />required. Frequen!-ly a combination of channel capacity plus the barrier- <br /> <br />type of reservoir control may be used to advantage for the control of <br /> <br />such floods and the prevention of damages. <br /> <br />-1- <br />