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<br />., <br />I <br />! <br /> <br />lo <br />,0 <br />" <br />., OJ <br />I -..} <br />i rv <br /> <br />4.0 RESERVOIR YIELDS <br /> <br />The Boyle Engineering Stream Simulation Model (BESTSM) was utilized to analyze the Upper <br /> <br /> <br />Colorado River Basin and to estimate yields from the proposed reservoir sites under various water <br /> <br />development conditions. <br /> <br />i The <br /> following: <br />.HI <br />j <br />..'1 0 <br />J 0 <br />0 <br /> 0 <br />J 0 <br /> <br />conditions analyzed to estimate yields from the proposed reservoirs include the <br /> <br />Three development scenarios <br /> <br />Reservoir operation with and without pumpback <br /> <br />Two alternative pumpback capacities <br /> <br /> <br />Alternative capacities of proposed reservoirs <br /> <br /> <br />Single reservoir and combinations of proposed reservoirs <br /> <br />This section briefly describes the hydrologic simulation model and its application, operating <br /> <br /> <br />rules incorporated and reservoir yields under various conditions. Supplemental information is in <br /> <br /> <br />Appendix A. <br /> <br />4.1 <br /> <br />HYDROLOGIC SIMULATION MODEL <br /> <br />The hydrologic system analyzed under this Study Is compiex. The streamflows in the basin <br /> <br />are affected by numerous transmountain and in-basin diversions and storage facilities. In addition, <br /> <br /> <br />water rights and legal and institutional arrangements existing in the study area impact the amount of <br /> <br /> <br />water available for development at a given location. To effectively perform such hydrologic analysis <br /> <br />and reliably compare various water development alternatives, the application of a hydrologic <br /> <br /> <br />simulation model was sought as part of this Study. A review was made of several existing hydrologic <br /> <br /> <br />simulation models. Most of these models were developed for site-specific purposes or did not have <br /> <br />the capability of handling the unique hydrologic and river operating conditions encountered in the <br /> <br />study area. For these reasons, the hydroiogic simuiation model, BESTSM which appeared to be most <br /> <br />suitable for the purpose of this Study, was selected with the approval of the Authority. BESTSM <br /> <br /> <br />accounts for monthly water volumes of inflows, diversions, return flows, river gains and losses, and <br /> <br />outflow for each segment of the stream system. <br /> <br />4-1 <br />