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0015J~ ..2~ in the United States. ,,"' Colorado says that this conclusion of the Report is inaoourate, and is oonfusing if not misleading to the affected states and the Congress. It involves the implied assumption that the natural oonsumption of water and the ohannel losses of virgin flow. volumes and conditions will prevaili Un_ &iminishc& in amount regardless of futura streamflow. volumes and conditions, - an assumption which, being contrary to known fac'efF, ill unjustified. In order to depleta the flow. into Mexico from its estimated virgiR volume of 17,720,000 acre feet, to its future volume of 1,500,000 acre feet as fixs~ by the Treaty, it will be neoessary to utilize in the United States a quantity of water materially greater than'the reported 16,220,000 acre feet annually. The amount by which the uses of wate~ and depletions of stream_ flows in the United States will exoeed 16,220,000 acre feet annually, will be determined by the e~tent to which the natural consumption and losses of water. whioh pre.vailed under the streamflow volumes of virgin conditions, are reduoed. or prevented. or avoided, or are' ccnverted to beneficial oonsumptive uses. with development in the United States. ,0 .. Colorado points out that existing developments and uses of water in the United States have alread7 had the effect of reducimg the natural losses under virgi~ oonditio4s; thae the estimated 1,030,000 acre feet of natural: or virgin ohannel 10s5 in the seotion of the Colorado River fl'(,nr Boulder Dsn to Laguna Dam has; been materially reduoed in amount si nee Lake Mead came into operation, by reaso~ of the more regulated streamflow. volumes and the reduoed flows to Mexico; that the estimated 1,007,000 acre feat of naturali or virgin channel loss in the seotion of the Gila River from the vicinity of Phoeni~ downstream. incident to the conveyance af 2.279,000 acre feet of estimated natural or virgin oondition inflows to the Phoeni% vicinity, has Binoa been largely reducedl in amount by the developmentS"which store, divert, use and consume the water supplies 6t; and above the Pr.oeniJK vicinitYI and that all such channel loss reductions constitute savings; or the sal vagSf of wate!'"~ whioh oorresp~n<l:lngJly add to the supplieS' available i~. the United" States'. Tl>> above mentioned example sunder presenit developmer...~'i' aI~ in amount~ whioh are subject to determination by comparative analytioal studies. ~ Colorado sayS'that further reduotiona in the natural losseS' of virgil!l! condition~ will ne~essa~ily accompany the future progressiv~ development in the United States; and that in the future, with full developmont in the United StateII', whe~ the flow. of the Colorado Rivor at Lee Perry has bee~ reduce~ from its vi~gil!l! volume of about 16,000,000 aore feet to about hale that amount. and when the flow. of the Colorado River at the International Boundary ha~ been reduoecf from ita virgilll' volume of about 17,700,000 acre feet to about 1.500,000 acre feet. the further reduotionll' in natural losses will furthe!'" inorease the supply of water available in the United StateS'o The future salvagSf of water is subject to estimation from engineering dat~ and studieS' with as much assurance of accuracy as estimations of the future depletions by so-called potential projects. Estina tionS' of salvageQl watelr cle arly should be included in this Report on the future development and, ful] utilization in the United States. of all the waten of the Colorado River System available to the State~ of the Colorado River Basin.