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<br />U. S. BUR AU OF R:';CLill!1ATION REPORT (COET' D.) <br /> <br />ClillRRY CREEll PROJECT (COET 'D) <br /> <br />the project plan outlined by tho Bureau. <br /> <br />FLOOD CONTROL. <br /> <br />Reservoir capacity in the proposed Castlswood Reservoir, <br />to be reserved for flood control, was fixed by the Bureau at 27,400 <br /> <br />acre~feet, in addition to the B,OOO acre-feet, dedicated to irrigation <br /> <br />and sedimentation. <br /> <br />Determination of flood control capacitywas based on rather <br /> <br />. <br /> <br />comprehensive anJ detailed studies of past floods in Cherry Creek and of <br /> <br />storms in eastern colorado to whioh Cherry Creek watershed is or may <br /> <br />b6<}ome subject, and v[hich might, if such storms occurred on Cherry Creek, <br /> <br />produce flood conditions at the Castlewood Dam, <br /> <br />The greatest storm of record in eastern Colorado, during <br /> <br />some BO-years occupation of the state, occurred on llemorial Day of 1935~ <br /> <br />In the absence of rainfall intensity records, these were reoonstructed <br /> <br />from ycnm[n runoffs in that portion of the maximum storm which produced <br /> <br />the greatest flood conditions. Using these data, together with assumed <br /> <br />displacement and rotation, to secure maximum effect on the Cherry Creek <br /> <br />watershed, the so-called "maximum flood" has been calculated, involving <br /> <br />a combination of assurred conditions which, the report states: <br /> <br />"would probably not occur with a frequency <br />of less than several thousand years although <br />possible of occurrenoe in any year," <br /> <br />The designation of the design flood, used by the Bureau, <br /> <br />as "maximum flood" does not mean that a greater flood is impossible~ <br /> <br />-16~ <br />