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<br />. <br /> <br />. <br /> <br />9 <br /> <br />~ <br />o <br />1-' <br />0) <br /> <br />:~n of salt/year. The salt pickup associated ~ith the additional <br />....o.t,er use would further increase the salt load by about 290,000 tons/ <br />:,'2'.. primarily from salt laden agriculture return flows. Thus, the <br />:2tal salt load above Lake Powell would be increased by about 840,000 <br />::~s/yr. Since all of the water would be consumptively used above <br />_~~e Powell no salinity benefits would result in the Lower Basin <br /> <br />='::"om addi.tional runoff. Therefore, if all of the additional 1.3 maf/yr <br /> <br />~enerated by the weather modification program is used by the Upper <br /> <br />=~sin states, salinity concentrations at Imperial Dam would be in- <br /> <br />:::--eased by about 84 mg/I. <br />Under condition (2), if the additional 1.3 maf/yr generated by <br /> <br />-: ::e weather modification program is used to meet part of the Mexican <br /> <br />':"ter Treaty commitment, releases from Lake PO','lell would be increased <br />:y 650,000 acre-feet over the current minimum release leaving an <br />"dditional 650,000 acre-feet for use by the Upper Basin states. The <br />"iditional releases from Lake Powell will free the Lower Basin states <br /> <br />:: 650,000 acre-feet of their half of the Mexican Water Treaty com- <br />::itment. This amount of water Ivould then be available for use by <br />'::.e Lower Basin. The additional water use of the Upper Basin states <br />',.ould increase river salt loads by 145,000 tons/yr. The additional <br />::>unoff would increase the salt load by another 550,000 tons, bringing <br />~ne total increase in salt load above Lake Powell to about 694,000 <br />:ons/yr. This increase in salt load is equivalent to about 69 mg/l <br />increase in salinity at Imperial Dam. The 650,000 acre-feet inflow <br />;:,f water to Lake Powell is equivalent to a decrease in salinity at <br />::::iperial Dam of about 65 mg/l, thus rougnly offsetting the salinity <br />increase due to salt loading. The additional 650,000 acre-feet that <br />