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<br />., <br /> <br />in the Taylor River below Taylor Park Dam, and minimum allowable water levels <br />for Taylor Park Reservoir. The analysis indicated that yields were very <br />sensitive to the assumptions used. Regarding the water right assumption, an <br />export from Taylor Park Reservoir might be supported by the Uncompahgre Valley <br />Water User Association's (UVWUA) Taylor Park storage decree with replacement <br />water purchased from Bl ue Mesa Reservoir; by transfer of the Upper Gunni son <br />River Water Conservancy District's (UGWCD) conditional storage decrees; or by <br />a new storage decree. For the purpose of this study, the UVWUA storage decree <br />was used to determi ne the yi e 1 d usi ng an exi st i ng water ri ght and then the <br />storabl e f.low avail abl e under a new storage decree was evaluated in order to <br />determine the range of export yields available from Taylor Park Reservoir. <br />The results i ndi cated that us i ng the UVWUA Taylor Park storage decree to <br />support the diversions with replacement water purchased from Blue Mesa <br />Reservoir resulted in the. highest yield while using a new junior storage <br />decree without replacement storage resulted in relatively low average annual <br />yield and zero yield during several years of the operation study. Utilizing <br />the UVWUA water right resulted in a range of average annual yield from the <br />existing Taylor Park Reservoir of between about 24,000 af and 60,000 af <br />depending on the instream flow r.equirement used. Raising Taylor Park Dam <br />about 20 feet would result in increasing the yield to a maximum of 82,000 af, <br />again depending on the instream flow requirement assumed. Table 5.9 presents <br />a comparison of these four basic projects. <br /> <br />~ <br />t;,) <br />W <br /> <br />The Central Colorado project was dropped from consideration because it <br />can only economically deliver water to the Arkansas River Basin and because it <br />does not have an economic advantage over the other projects until the yield is <br />in excess of about 150,000 af.' Of the three remaining projects, both the <br />Collegiate Range and Union Park Projects require construction of major new <br />storage reservoirs (two reservoirs in the case of Collegiate Range). All <br />three of the projects include water conductors approximately 42 miles long <br />from the Upper Taylor River Basin to the vicinity of Antero Reservoir (see <br />Figure 5.2). The Taylor Park Project average annual yield is lower than the <br />other two projects and in order to increase that yield either Taylor Park Dam <br />must be raised or a pipeline and series of pumping stations must be <br />constructed from Blue Mesa Reservoir to Taylor Park Reservoir. Either of <br /> <br />5-7 <br /> <br />