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-1 <br />IPotential increased demand by Aspinall Unit hydropower rights in the <br />� basin may result if these direct flow decrees are fully utilized to support <br />power production. The hydrologic model was calibrated using only Aspinall <br />Unit storage decrees to support the power generation. As discussed in Section <br />I3.4, this was done to calibrate the model with historical reservoir <br />operations. The study has not addressed full administration of these existing <br />Jhydropower rights against upstream junior diversions. However, in the March <br />1984 issue of Colorado Stream Lines, Keith Kepler, Assistant Division IV <br />� Engineer stated that, in his opinion, export of water from Taylor Park would <br />not be feasible if hydroelectric power rights are fully exercised in the <br />future. <br />For the purpose of this study, the yield was estimated using both the <br />IUVWUA storage decree and a new storage decree because this approach provides <br />i <br />an upper and lower limit, respectively, for the ran9e of export yields. The <br />IUVWUA storage decree was used in the analysis to illustrate the effects of <br />using an existing senior water right to support transmountain exports and does <br />I not imply that the Board of Directors of the UVWUA anticipates or supports <br />such an arrangement. It should also be noted that several significant <br />I institutional factors, such as changing the decreed use of the water, would <br />have to be resolved before this right could be used to support an export <br />project. <br />1 <br />I Three different Taylor River instream flow regimes were used to evaluate <br />Ipotential effects on export yields. Regime I assumes that streamflows below <br />Taylor Park Dam will not be allowed to go below the CWCB's instream flow <br />I decree. Regime II assumes a higher streamflow which simulates the present <br />target releases under the Taylor Park Exchange Agreement. Regime III is <br />identical to Regime II with the exception that flows during two summer months <br />Iof the year are increased to 300 cfs from the 150 cfs of Regime II. <br />The minimum target storage level assumed for Taylor Park Reservoir was <br />23,400 af (elevation 9268) which corresponds to a drawdown of approximately 62 <br />feet below full normal pool. The historic lowest level reached was 8780 af <br />� <br />