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<br />. <br /> <br />e <br /> <br />. <br /> <br />INTRODUCfION <br />A number of entities with water rights in Bear Creek have requested various amounts of storage space <br />in Bear Creek Reservoir for various purposes. The Colorado Water Conservation Board (CWCB) <br />is one of these entities and has requested 2,000 acre-feet of storage space over and above the <br />permanent pool. The various entities will store water attributable to "changed" direct flow rights or <br />by virtue of storage rights. The CWCB fits into both of these categories. Most of the filling will <br />normally occur during the high runoff months of May and June for storage rights, and direct flow <br />rights will be stored as a result of a decree granted by the Water Court. <br /> <br />For most entities, releases will occur during the non-irrigation season or during dry months when <br />augmentation water is needed. Evaporation losses from the permanent pool and accounts will be <br />debited to each entity according to an agreed upon formula. The current thinking is that CWCB will <br />make up 50 percent of the permanent pool evaporation losses and the remaining 50 percent of the <br />permanent pool evaporation losses will be debited to each entity in proportion to the volume of <br />storage requested and granted. Each entity will cover evaporative losses from its account completely. <br /> <br />The filling and releasing of storage water, in addition to evaporation losses, will cause a rise or fall in <br />the reservoir level of Bear Creek Reservoir as the State Engineer administers these decrees. Because <br />the City of Lakewood has an agreement with the State to provide recreation facilities near the lake, <br />it is concerned with fluctuations in the lake. Accordingly, the various entities seeking storage have <br />agreed to participate in a simulated operation study that will model the effect of inflows and releases <br />by the various entities, plus evaporation losses, for the purpose of identifying extremes in the lake level <br />fluctuations. <br /> <br />The years 1949 through 1957 were selected as the period of study. This period includes the wet years <br />of 1949,1952 and 1957, the drought cycle of 1954 through 1956 and the more average type of years <br />such as 1950, 1951 and 1953. Also, this period encompassed a period when agriculture was the <br />dominant use of water diverted from Bear Creek just prior to the urbanization of the area. <br /> <br />PURPOSE AND SCOPE <br />The primary purpose of this report is to quantify the storable flows available to the CWCB's water <br />rights for the 1949-1957 period. Whenever applicable, the Bear Creek Water Rights Computer Model <br />will be used as an aid to quantify CWCB's storable flows. Also taken into account will be the South <br />Platte River calls which have not been inputed into the Model. Storable flows will be calculated on <br />a daily basis and summarized monthly. The CWCB's evaporation losses, releases and other <br />commitments for its water will not be quantified in this report. The CWCB will do so later. <br /> <br />89-026.00W <br /> <br />.1 <br />.1959 <br />