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