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<br />. . <br /> <br />. <br /> <br />. <br /> <br />8 <br /> <br />con22,-~~ations without and with augmentation involving many asslli~ptions <br /> <br />reg~~ii~g f~ture water supply and water use. However, approximations <br /> <br />>J;;.. <br />o <br />/--i. <br />C.Jl <br /> <br />of ",,::'i::ity impacts can be made based on p~evious studies which \'fere <br />made ::r purposes other than "the evaluation of salinity impacts of <br />rivs~ ~~gmentation. These studies indicace that, provided flow at <br />Imps 2'::',,1 Da:l' remains the same, the addition of each 10,000 tons of <br />sal'~ to the" river system above Lake Powell increases salinity at <br />Impe~::.al Dam by about 1 mg/l. The addition of 10,000 acre-feet of <br />sal~ f~ee water decreases salinity by about 1 mg/l, provided the addi- <br /> <br />tional ;.rater is not consumptively used. <br />1,- order to estimate the salinity impacts of weather modification <br /> <br />usinE;::o.e above criteria, it is necessary to determine how and where <br /> <br />the additional water supplies would be used. For the purposes of <br /> <br />this presentation, it was assumed that the additional water made <br /> <br />available to the Upper Basin states would be used for the Same purposes <br />and in the same proportions as projected for the "1981 Revision - Water <br />Quality Standards for Salinity" prepared by the seven-state Colorado <br />River Basin Salinity Control Forum for its 1995 "high" projection: <br />2310 out-of-basin exports, 3910 in-basin agriculture, 2510 in~basin <br /> <br />energy resources development, and 1310 in-basin miscellaneous uses. <br /> <br />For the Lower Basin, it was assumed that most of the additional water <br />would be exported out of the basin by Arizona's Central Arizona Project <br />and The Metropolitan Water District of Southern California. <br />Under conditions (1) it was assumed that the additional 1.3 <br />maf/yr of water would be used by the Upper Basin states for the <br />purposes indicated above. The increased runoff generated by the <br /> <br />weather n~dification program would contribute an additional 550,000 <br />