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<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />2.0 STUDY APPROACH <br />An assessment of the impacts of the Pot Hook, Three Forks, Sheep Mountain, and <br />Powder Wash projects upon Little Snake River flows at Lily, Colorado was determined <br />using the WIRSOS digital simulation model of the Little Snake River Basin. The following <br />sections of this chapter discuss the WIRSOS model, justifications for its use for this study, <br />a description of previous applications of WIRSOS for the Little Snake River Basin, and <br />its application for this study. <br />2.1 GENERAL DESCRIPTION OF WIRSOS MODEL <br />The Wyoming Integrated River System Operation Study (WIRSOS) Model was <br />originally developed by Leonard Rice Consulting Water Engineers, Inc., Denver, Colorado <br />for the State of Wyoming as a tool for assessing the impacts of various water rights claims <br />associated with the Big Horn River adjudication. Since its development, WIRSOS has <br />been used to evaluate other projects in Wyoming including Sandstone Reservoir in the <br />Little Snake River Basin. <br />WIRSOS is a river system model specifically coded to quantify streamflows and <br />simulated reservoir operations and direct flow diversions under priority administration. It <br />may be used to model reservoirs within a basin and assess the ability of reservoirs to <br />supply water; as a total supply or supplemental supply, to associated lands. WIRSOS <br />operates on a strict prior appropriation basis. The most senior priority water right <br />8 <br />