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I I J i i: . -''''j01'\ \.;utl.;JC -7- , depletion estimates presented in the Report are based on the rule of evaluation at..the.,site, and, to indioate their resulting effeots upon outflows at Lee Ferry or the International Boundary, it beoomes neoessary to allow for and subtraot the losses whioh the water, if not oonsumed at the site, would suffer inoident to its oonveys.noe to Lee Ferry or the International Boundary. II To make the neoessary oorreotions in reported depletion quantities, information is neoessary oonoerning ohannel conveyanoe losses. The Report oontains estimates of ohannel conveyanoe losses under virgin oonditions on the Gila River below Phoenix, whi.oh appear to have been employed to estimate the depletions in Arizona shown in the Report. It also oontains estimates of ohannel oonveyance losses under virgin oonditions on the Lower Colorado River below Boulder De.m, These appear to have been employed to oalculate the outflows to Mexico aoross the International Boundary, but to have been disregarded in estimating the depletions in California. The Report contains no information concerning ohannel conveyance losses along the Oolorado River and its tributaries above Boulder De.m, or in the Upper Basin above Lee Ferry. Colorado reoommends, since this information is essential for the determinations of water supplies available for utilization, and for the appropriate adjustment and maintenanoe of interstate relations, that the Report be modified to inolude estimations of channel conveyanoe losses under virgin, present (existing), and full development oonditions. " ~ t,I tif'.r' ~~' ), ;f .' 6. Water supplies and depletions should be presented in terms cam- F:rable t~ those of the Oolorado Hi ver Compact. In order that affected states may make use of, so far as possible, the plans, proposals and reoom- mendations of the Report, it is essential that all determinations and esti- mations of water supplies, stree.mflow depletions and water utilization and disposal be in terms direotly oomparable with apportionment provisions of the Colorado River Compact. A necessary first step, in order that both basins may know what further developments are possible, and what further uses of water are permissible, within presently authorized limits, is a comparison between present uses or depletions within each basin and the quanti ties of water heretofore apportioned to eaoh basin by the Colorado Ri ver Compact. " I'. ~ , \~ile there may be disagreement e.mong individual states conoerning interpretations of some provisions of the Compact, there appears to be no basis for dispute between the two basins concerning: these faots I (1) by Articles III (a) and (b) thereof, the Colorado River Compact apportioned 7,500,000 acre feet of water per annum to the Upper Basin, and 8,500,000 aore feet per ar~um to the Lower Basin; and (2) by Article III (f) the Compact speoified that, at any time after October 1, 1963, if and when either basin shall have reached the total beneficial consumptive use of said quantities of water, further equitable apportionment may be under- taken of the surplus water over and above the quantities heretofore