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I r I I I I I I .~ .:?J I I I I I I I ..t) I I INTRODUcnON A number of entities with water rights in Bear Creek have r~uested various amounts of storage space in Bear Creek Reservoir for various purposes. The Colorado Water ConselV8tion Board (CWCB) is one of these entities and has r~uested 2,000 acre-feet of storage space over and above the permanent pool The various entities will store water annbutable to "changed" direct flow rights or by virtue of storage rightS. The CWCB fits into both of these categories. Most of the filling will normally oa:ur during the high runoff months of May and Jurie for storage rights, and direct now rights will be stored as a result of a decree granted by the Water Coun. For most entities, releases will oc:cur during the non-irrigation season or during dry months when augmentation water is needed. Evaporation losses from the permanent pool and accounts will be debited to each entity aa:ording to an agreed upon formula. The current thinking is that CWCB will make up 50 percent of the permanent pool evaporation losses and the remaining 50 percent of the permanent pool evaporation losses will be debited to each entity in proportion to the volume of storage r~uested and granted. Each entity will cover evaporative losses from its alXOunt completely. The filling and releasing of storage water, in addition to evaporation losses, will cause a rise or fall in the reservoir level of Bear Creek Reservoir as the State Engineer administers these decrees. Becluse the City of Lakewood has an agreement with the Slate to provide recreation facilities near the lake. it is concerned with nuctuatioDS in the lake. Accordingly, the various entities seeking storage have agreed to participate in a simulated operation study that will model the effect of inflows and releases by the various entities, plus evaporation losses, for the purpose of identifying enremes in the lake level nuctuations. The years 1949 through 1957 were selected as the period of study. This period includes the wet years of 1949, 1952 and 1957, the drought cycle of 1954 through 1956 and the more average type of years such as 1950, 1951 and 1953. Also, this period encompassed a period when agriculture was the dominant use of water diverted from Bear Creek just prior to the urbanization of the area. PURPOSE AND SCOPE The primary purpose of this report is to quantify the storable nows available to the CWCB's water rights for the 1949-1957 period. Whenever applicable, the Bear Creek Water Rights Computer Model will be used as an aid to quantify CWCB's storable news. Also taken into account will be the South Platte River calls which have not been inputed into the Model. Storable flows will be calculated on a daily basis and summarized monthly. The CWCB's evaporation losses, releases and other commitments for its watel will Dot be quantified in this report. The CWCB will do so later. --