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<br />001841 <br /> <br />Runs were made at the 0 and 2-ton/acre pickup rates. <br /> <br />(lb) - 2000 - Mod - This run was a modification of the original <br />(lb) - 2000 run to reflect recent trends and decisions involving <br />construction of water projects. Deleted projects include the Four <br />County and San Miguel on the Colorado River, and Resources Incor- <br />porated and the Dixie Project within the modeled area. Lake Mead <br />M. and I, was inadvertently reduced to 1990 levels, but has only a <br />very minor effect on results. Only the 2-ton/acre pickup rate was <br />used. <br /> <br />(lc) - 2000 - This condition is based on the original (lb) - 2000 run <br />in which a total of 1,875,000 acre-feet/year in depletions was added <br />to the base run. Assuming full development of the Upper Basin as <br />5.8 million acre-feet/year and taking into account depletions already <br />in the base run, an additional 550,000 acre-feet/year in depletions <br />are allowed. The added projects are assumed the Ute Indian and Wyo- <br />ming M. and I. developments on the Green River and Colorado II. and I. <br />on the Colorado. Values are shown in Table X. Runs were made at <br />both the 0 and 2-ton/acre pickup rates. <br /> <br />Weather Modification <br /> <br />The annual increase in streamflow from weather modification above <br />stream gages on the Green River at Green River, Utah, the Colorado <br />River at Cisco, Utah, and the San Juan River near Bluff, Utah, for <br />the 1941-1970 period is given in Appendix E. Assumptions used in <br />deriving these estimates are included. These values represent the <br />maximum or full amount of weather modification. Mean annual values <br />are: <br /> <br />Green River <br />Colorado River <br />San Juan River <br /> <br />682,000 acre-feet <br />823,000 acre-feet <br />420,000 acre-feet <br /> <br />Total <br /> <br />1,925,000 acre-feet <br /> <br />Present modified data were used to determine the additional salt <br />pickup due to increased runoff from weather modification. Since <br />flow increases are given as annual amounts, monthly values were <br />summed to yield the mass of flow and salt at each station for each <br />year. The method of least squares was then used to fit a polynomial <br />curve to the annual data in an attempt to correlate salt and flow. <br />Results are given in Figures 13-15. <br /> <br />The solid curves represent a second degree relationship while the <br />dashed ones correspond to a linear fit. The goodness of fit, as <br />expressed by the percent explained variance, is compared for both <br />relationships below: <br /> <br />31 <br />