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I r I I I I I I ~1 I I '. . I . I f\ I I STORABLE FLOWS Dinct n- Water JUgbb As mentioned above, the CWCB estimates that the historical average depletions of the Simonton Ditch were 276 aae-feet/year. Nonnally, this amount of water could replace most all of the annual evaporation from the present Conservation Pool of 1,989 acre.feeL At that level, the surface area is approximately 107 acres. The Simonton rigllt, if sua:essfu.1ly transferred for this purpose. would receive a full water supply in all yean of this stUdy. Stonge Rights The storable water available from the CWCB storage rights of 3,989 acre-feet depends on the excess water available in Bear Creek. The Model quantifies the water available to water rights junior to Priority No. 19 on a daily basis. Most of these junior water rigllts belong to the Denver Water Depanment although the junior !"llter rights in the Ward Canal could divert a portion of the excess water. Denver Conduit 15, a 72.inch diameter pipe, conveys water from the Harriman Ditch headgate to Marston Lake. There is sufficient capacity for Denver's junior water rights to divert about 150 cfs. Although it may be conservative to subttact the full 150 cfs at all times from the excess water available in Bear Creek by the Model, this was done to compute the storable flows available to the CWCB's storage water rights during times of no demand on the South Platte River. Since the Model excludes 1949, a very wet year, the storable flows were estimated by subtracting a full- 230 cfs from the measured flows at the Morrison Gage on Bear Creek at all times. There would be a full supply available to CWCB in 1949. The supporting calculations for the storable flows can be found in Appenclix C. which consists of computer sheets for months when excess water would have been available in Bear Creek for the CWCB storage rights. The dplanation of the column headings of the computer printouts can be found in Table A. The storable water in Bear Creek, on a monthly basis, is sUIIlIl1arized in Table B. Also shown are the amounts available to the CWCB. The CWCB had a full supply of 3.989 acre. feet during both 1949 and 1957. A total of 2,.540 acre.feet could have been stored during 1952 and no storable water was available during the remaining years of 1950, 1951, 1953, 1954, 1955 and 1956. Note that no water was stored during the winter months. During most "wet" years. the daily flow rarely exceeds 40 d's, during which time the City of Denver can be dpected to divert the entire amount from November 1 through March 31. Nonnally, there is also a South Platte River call most of the time during this period. -- 7