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<br />aEPClRT ON POTENTI!\L FOR <br />CONVERTING C!1ATFlELD, BEAR CREEK <br />& CHERRY CREEK (TRl-LAKES) <br />FLOOD CO~rROL STORAGE TO WATER SUPPLY STORAGE <br /> <br />. <br /> <br />1. Purp:Jse. Considerable interest has oeen generated in thr= Denver area <br /> <br />regarding the potential for converting flood storage space in the Tri-Lakes <br /> <br />reservoirs to water supply storage. It is the purpose of this report to <br /> <br />present the hydrologic assumptions and operating requirements chat can make <br /> <br />conversion a practical consideration. Also presented in this report are the <br /> <br />:.)tential impacts this action '.'/QuId have on both the pool levels at each <br /> <br />-;roject and on the South Platte River flows at the Henderson 3agin:s station <br /> <br />\4'1ich is considered the dO'.-IT1stream control point for this analysis. <br /> <br />2. Original Storage Allocations. D,esignated storClge allocations have chClnged <br /> <br />at the Chatfield and Cherry Creek projects sin~e operation of these projects <br /> <br />began. The original allocations at each project are presented on plate 1. <br /> <br />. <br /> <br />3. Change in Reservoir ~sign Assumptions. Tne willingness of the Corps to <br /> <br />"free up" flood storage and exchange it for lvater supply sp3ce can be attrib- <br /> <br />uted to thc conservative hydrologic assumptions used in ti1e original design of <br /> <br />the flood storage requirements at the C1atfield and Bear Creek projects. <br /> <br />Although the Cherry Creek project also has excess flood storage, the potential <br /> <br />probl~ns associated with inter-basin tr~nsfers during the occurrence of ~ajor <br /> <br />floods has negated chan~es of \~onverting the flood storage at this project to <br /> <br />water supply use. In reevaluatiniS the flood storage requir.emcnt at Chatfield <br /> <br />and B,"ar Cn~ci<, it \v3s assumed that controlling either the standard project <br /> <br />rainfall runoff or the SOG-year ~ount~in sno'dnelt event would provide ~dequ3te <br /> <br />flood control protection for the Denver l1etropoli tan Are:!. !\ br ief j iscussion <br /> <br />of the change in flood storage requirements as ~ result of this reev31uation <br /> <br />fo11m./s. <br /> <br />. <br />