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<br />. <br /> <br />. <br /> <br />7 <br /> <br />E'tudies without a weather modification prograr.: and with a 'iieather <br /> <br />r.;odification program beginning in 1991. In acdition, it was assumed <br /> <br />..::::. <br />o <br />..... <br />w;;. <br /> <br />that future ;~ater demands in the Upper Basin ,.lCuld reach a maximum <br /> <br /> <br />in the year 2000 of 5.4 maflyr and remain cons~a~t for the period <br /> <br /> <br />2000 00 2020. They also operated the Basin reservoir system so as <br /> <br />to r:;3Ximize the required storage in Lake Powell and minimize the <br /> <br /> <br />storage at Lake Mead. The above criteria resulted in most of the <br /> <br /> <br />water generated by weather modification flowing to the Lower Basin, <br /> <br />primarily to increase storage in Lake Mead and to reduce shortages <br /> <br /> <br />in the Central Arizona Project. Because of these criteria, the <br /> <br />Bureau's analysis showed an average decrease in salinity at Imperial <br />Dam for the 1991 through 2020 period of 91 mg/l when comparing the <br /> <br />river's salinity with and without weather mOdification. <br />This study is useful, for the portion of period in which demands <br /> <br />are increasing, but we believed that it is also necessary to isolate <br /> <br />and analyze the impact of use of the additional supply projected to <br /> <br />be produced by weather modification under conditions of full develop- <br />ment in the Basin. We assumed two possible conditions relative to <br />the future use of the additional supply: (1) the water would be used <br />entirely in the Upper Basin, and (2) the 1.3 mar of additional water <br />would be used to meet the 1.5 maflyr commitment of the Mexican Water <br /> <br />Treaty, thereby releasing the Upper and Lower Basin states from most <br />of tllis responsibility. The impacts of the available water supplies <br />of the Upper and Lower Basins of the second condition would be the <br />same as dividing the additional water equally between the two. <br /> <br />, <br />An accurate evaluation of flow augmentation on salinity con- <br />centrations would require lengthy computer studies to compare salinity <br />