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. . 10 would be available for use by the Lower Basin would probably be , ..:;:.. o I-' -.J exported out of the b';sin. Therefore, this additional use would not add to the salt load of the river. The integrated salinity impact of using the 1.3 lOaf/yr. generated by weather modification to meet part of the Mexican Water Treaty commitment would be an increase in salinity at Imperial Dam of about 5 mg/l. Since this calculated impact is small, and because the method of analysis is approximate, it could be said that the salinity impact is negligib:~. SUMMARY Because future demands on the Colorado River will exceed th9 available supply, it is necessary to augment the flo\-, of the :::-i-,'91'. The U.S. Bureau of Reclamation estimates that 1.3 maf/yr could 09 added to the flow of the river by the implementation of a basinwide weather modification program. The i~pact on salinity concentra~io~ of the proposed weather modification program is dependent on ti~in[ and what is ultimately done with the additional water supply. The Bureau of Reclamation, based on a single study and set of condi~io~~ for' the period through the year 2020 ''Tith ''Tater demand froze:. as 0: the year 2000, determined that salinity would average 91 rug/: less with weather modification. Once the river's natural water supply . has been fully developed, the salinity impact of weather modific e:;;i::-. depends on how and where the supply is used. Should the ad~itic~e: supply be used entirely by the Upper Basin states, salinity concs:',- trations at Imperial Dam would increase by about 84 109/l. Howev~r, if used to lOeet part of the Mexican Water Treaty corr.mi tment, sa::" i~,:'. ~:: impacts at Imperial Dam would be small. It should be noted ':~L: ::c~'-. the Bureau's and our evaluation are limited in scope and adcii:i .;:~s.: