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<br />Basin, and should be treated as a list of development possibilities from
<br />whioh eaoh State may make suoh seleotions as ultimate17 ina7..be reqUired
<br />to avoid exoeeding the rights of the Uppsr Basin and of the States of the
<br />Upper Division under the Colorado River Compaot.
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<br />39. For purposes of disoussion, the depletions of potential Upper
<br />Basin projeots: may be segregated and oonsidered in',t);lreEv categories; .
<br />
<br />(1) irrigation projeots; within the natural basin, for the re-
<br />olamation of "new lands" (or lands not nOW'irrigated), and to provide sup-
<br />plemental water supplies for lands now inadequately irrigated;'
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<br />(2) export diversions for use outside the natural basin; and,
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<br />(3) evaporation losses from main-stem power end regulation re..
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<br />servoirs.
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<br />Under the plan outlined in the Report it appears that de-pletion
<br />oharges are made in aooordanoe with the location of the resulting bene-
<br />fits, - a formula of which Colorado approves. Thereunder the depletions
<br />of irrigation projeots are oharged against the State in whioh the bene-
<br />fited aoreages are looated; the depletions of eXportation projeots
<br />against the State in which the water is used; and the depletions of main-
<br />stem power and regulation reservoirs are not segregated by States, sinoe
<br />their benefits to power and water users, upstream and downstream there-
<br />from, cannot now be antioipated. Their depletions are entered, for the
<br />present, against the basin in whioh the reservoirs are looated, and Colo-
<br />rado approves of that temporary arrangement, subjeot to suoh revisions
<br />,as may be diotated by determinati ons of the looations of benefits when
<br />and after suoh reservoirs are oonstruoted.
<br />
<br />40. . Considering that group of potential Upper Basin projeots which
<br />previously herein were designated the "initial list", or next stage of
<br />,oonstruotion, Cclor,ado suggests that their depletions be estimated and
<br />- shown in the Report. Using rates employed by the Bureau of Reolamation
<br />,for ,estimating the future depletions of potential irrigation projeots,
<br />and exportation quantities hereinafter defined, Colorado engineers have '
<br />estimated the depletions of said initial list of Upper Basin projects at
<br />2,631,000 aore feet in a year of normal olimatio oonditions, and at
<br />2,174,000 aore feet in a year of drouth conditions suoh &IS 19~1-1940.
<br />Both averages inolude the allO\lfances of the Report for Irojects now
<br />authorized and under oonstruotion in the Upper Basin. The reoorded flow'
<br />at Lee Ferry during 1931-1940 averaged 10,167,000 aore feet per year.
<br />That unoonsumed outflow from the Upper Basin r~8ined after all then
<br />existing depletions upstream from Lee Ferry had taken their toll of wa-
<br />ter. During a period in the' future similar to 19~1-1940, should suoh
<br />a period OCOIU!" after the projeots now authorized and under oonstruotion
<br />are completed, and after the said initial list of projeots have been ccn.
<br />struoted, the flow. at Lee Ferry will amount to 10,167,000 minus 2,174,000
<br />of 7,99~,OOO acre feet psr year, or to 79,9~,OOO aore feet in the as-
<br />SUllIed tern-year period. Sinoe that quantity exoeedil the delivery obliga-
<br />tions of 75,000,000 aore feet imposed by Art. III (d) of the Colorado
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