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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 />II <br />~ <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br /> <br />000278 <br /> <br />2.2 PREVIOUS WIRSOS STUDIES ON UTILE SNAKE RIVER <br /> <br />Previous studies by WWC include an assessment of the effects of Sandstone <br /> <br />Reservoir on flows at the mouth of the Little Snake River utilizing the WlRSOS model. <br /> <br />Study results are presented in Streamflow Depletion Study, Sandstone Reservoir (SWEC, <br /> <br /> <br />February 1987), hereinafter called Sandstone Depletion Study. For this study WIRSOS <br /> <br /> <br />data files were developed which model the Little Snake Basin for the 1930-1982 period. <br /> <br /> <br />The model was calibrated and then used to evaluate the effects of the Sandstone Project <br /> <br /> <br />by examining flows at the basin mouth with and without the reservoir in place. Minor <br /> <br />modifications to the WIRSOS data files will be necessary to model the subject water rights <br /> <br />projects for this study. <br />A general schematic diagram of the Little Snake River Basin as previously modeled <br /> <br />by WWC using WIRSOS is presented on Figure 3. This schematic shows the relative <br /> <br />locations of gaged inflows and outflows, ungaged inflow, intermediate streamflow gaging <br /> <br />stations, irrigation, municipal and industrial diversions, and Cheyenne's Stage I and II <br /> <br />transmountain diversions. The WIRSOS input data used by WWC for the Sandstone <br /> <br />Depletion Study is discussed below. <br /> <br />2.2.1 WIRSOS Input Data <br />Input data used for the previous WIRSOS modeling of the pre-Sandstone Reservoir <br /> <br />Little Snake Basin included virgin inflows and flows at intermediate locations in the study <br /> <br />10 <br />