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<br />I <br /> <br />4;:j~9 <br /> <br />HYDROGRAPHY <br /> <br />71 <br /> <br />diversion and reuse by lower projects. is not now available or of <br />practical importance as long as these irrigated projects are only <br />partially developed and while large volumes of Colorado River water <br />continue to waste unused into the Gu]f of California, This flow at <br />the mouth of the Colorado River, as yet of economic use only for <br />power development at Hoover and Parker dams is. of course, mainly <br />(80 per cent or more) upper basin allocated water, only temporarily <br />available in the lower basin. The items of table 14 are compiled <br />chiefly from reports of the U. S, Bureau of Reclamation and U. S, <br />Geological Survey and therefore represent reasonably close approxi- <br />mations, To the extent that return flows are not fully allowed for, <br />however. the indicated river loss is also too small by the same <br />amount and the consumptive use likewise too large, Ultimately, of <br />course. such river losses will be greatly reduced, after completion <br />of channelization work now under way and when upper basin allo- <br />cations are more completely in use above Lee Ferry. The larger <br />California diversions, however, are not affected by stich return flow <br />questions. consequently the possible error in the estimated con- <br /> <br />! <br /> <br />. <br /> <br /> <br />l <br /> <br />I <br /> <br /> <br />\ <br />t <br /> <br />Fig, 6. Colomdo River I>".,i." <br />