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<br /> <br />~ desalting works. into operation at an earlier date. Otherwise <br />00 <br />-.J there would be no significant effect on the augmentation study. <br />0') <br />Water Qu~lity--The introduction of from 2.0 to 2.5 m.a.f. <br /> <br />of pure water annually into the lower Colorado River would have <br /> <br />a significantly beneficial effect on water quality. The greatest <br /> <br />benefits would be obtained by thorougl\ mixing of this pure water <br /> <br />with natural river flows above the points of use. In foct, to <br /> <br />avoid wide fluctuations in water quality, which could be highly <br /> <br />undesirable, it might well be necessary to discharge desalted <br /> <br />water into the river upstream from the point of all major Lower <br /> <br />Basin uses. For this reason Lake Mead was selected as the point <br /> <br />in this study to receive desalted water. <br /> <br />There are other possibilities for obtaining a satisfactory <br /> <br />mix of desalted and natural waters. On" such scheme wOldd involve <br /> <br />construction ofa la.rge res"rvoir on the Bill Williams River which <br /> <br />would act as a regulating d"pository for desalt"d water to be fed <br /> <br />into.Lake Havasu at rates n"cessary to obtain desir"d mix"s. If <br /> <br />such a schem" prov"d feasible, it would r"dl!,ce the cos~s of the, <br /> <br />d"salt"d wat"r conveyance syst"m appreciably, particularly if a <br /> <br />route from th" Gulf of California prov"d feasibl". <br /> <br />M"xican Tr"aty Deliv"ry Obligation--L"gislation Ls pending <br /> <br />which provid"s that the costs of measures to satisfy th" obliga- <br /> <br />tions of the Mexican Water Treaty from the Colorado Riv"r plus <br /> <br />lc.sses of water associated with delivery of water under that <br /> <br />treaty would be treated as a national obligation and be <br /> <br />10 <br />