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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Reservoi r operati on studi es were conducted to eval uate the safe yi e 1 d for the <br />rehabi 1 i tated dam and reservoi r. The resul ts are presented on Tabl e IV. 8. <br />Future operati ng restri cti ons may be imposed by the Colorado State Engi neer I s <br />Office to limit the storage capacity of Barnes Meadow Reservoir, if the dam is <br />not modified to adequately accommodate the probable maximum flood. The <br />difference in project yi el d between operati ng a rehabil itated faci 1 i ty or <br />operati ng the exi sti ng reservoi r under fi 11 i ng restri cti ons wi 11 be compared <br />to determine the unit cost of water for repairing the structures. <br /> <br />Barnes Meadow Reservoir has a total reservoir content of 2,349 acre-ft at gage <br />height 40. Since the volume below gage height 10 is reserved for the U.S. <br />Forest Service (72 acre-ftl, an active pool of 2,277 acre-ft is available to <br />the City for satisfying municipal needs. <br /> <br />The results of the reservoi r operati on study, wi th full util i zati on of the <br />active capacity, indicate a safe yield of 1,406 acre-ft/yr is attainable. The <br />minimum annual reservoir content is 72 acre-ft and corresponds to a water <br />surface area of about 25 acres. The maximum content occurs when the reservoir <br />is full and has an approximate surface area of 108 acres. <br /> <br />The reservoir is typically operated on a daily and monthly basis by releasing <br />a constant flow to the river, starting around mid-November and extending to <br />March of the following year. The winter reservoir releases are determined by <br />dividing the volume in storage by the days for which storage water is needed. <br />Assumi ng water is needed for about 120 days each year, the reservoi r is <br />capable of providing a firm supply of about 11.7 acre-ft or 5.9 cfs daily. <br />Currently, all of the acti ve storage is rel eased each year and is empty in <br />March. Spring runoff usually fills the reservoir to its maximum yearly level <br />between April and July. <br /> <br />Operating under a self-imposed reservoir fill restriction limits active <br />storage to 1,928 acre-ft. The results of the. reservoir operation study for <br />this situation are shown in Table IV.9 and indicate only 1,301 acre-ft/yr is <br />attainable as a firm yield. This is equivalent to providing about 10.8 <br /> <br />1231 H <br /> <br />-32- <br />