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<br />003134 <br /> <br />Page 33 <br /> <br />The bases for the water use figures used herein were developed by the US <br /> <br />Bureau of Reclamation for use as input to the Colorado River Simulation Model <br /> <br />(CRSM) for the purpose of modeling salinity in the basin (USBR, 1983). These <br />data are listed in the Appendix. <br /> <br />In the Upper Basin, uses were aggregated into groups of similar type which <br /> <br />had roughly similar net value. The classes of use were Agriculture, Municipal <br /> <br />and Industrial (M&I), and Energy. This aggregation was made principally to <br /> <br />facilitate the unconstrained analysis where uses would be assigned a rank based <br /> <br />on their net value. The same groupings were used for the constrained case. <br /> <br />Uses in the Upper Basin were also aggregated by water use areas. One of <br /> <br />the basic assumptions of the study was that all existing uses of a class in the <br /> <br />Upper Basin have the same net value. Based on this assumption, it would be <br /> <br />necessary only to provide a node for each class of use. However, to do so could <br /> <br />introduce errors by concealing shortages at higher stations by assuming that <br /> <br />such aggregated demands could be met with the aggregate inflows, some of which <br /> <br />are not physically accessible by all of the demands. Because of the limited <br /> <br />scope of this project, it was impossible to model each use. Rather, uses were <br /> <br />aggregated within sub-basins to minimize errors. <br /> <br />The water use areas in the Upper Basin were: the upper Green River above <br /> <br />Flaming Gorge Reservoir; the Yampa/White/Little Snake drainage; the Upper <br />Colorado including the Colorado and Gunnison Rivers above and including Grand <br /> <br />Junction, Colorado and the Dolores drainage; the San Juan drainage; and western <br /> <br />tributaries in Utah such as the Duchesne. <br />