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Oll1484 -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 oonveyanoe to Lee Ferry or the International Boundary. " , To make the neoessary oorreotions in reported depletion quantities, information is neoessary oonoerning ohannel oonveyanoe losses. The Report oontains estimates of ohannel oonveyanoe losses under virgin oonditions on the Gila River below Phoenix, whioh appear to have been employed to estimate the depletions in Arizona shown in the Report. It also oontains estimates of ohannel oonveyanoe losses under virgin oonditions on the Lower Colorado River below Boulder Dam. These appear to have been employed to oaloulate the outflows to Mexioo aoroSs the International Boundary, but to have been disregarded in estimating the depletions in California. The Report oontains no information oonoerning ohannel oonveyanoe losses along the Colorado River and its tributaries above Boulder Dam, or in the Upper Basin above Lee Ferry. Colorado reoommends, sinoe 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 ohannel oonveyanoe losses under virgin, present (existing), and full development oonditions. " 6. Water supplies and depletions should be presented in terms oom- parable to those of the Colorado River Compaot. In order that affeoted 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, streamflow depletions and water utilization and disposal be in terms direotly oomparable with apportionment provisions of the Colorado River Compaot. A neoessary 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 oomparison between present uses or depletions within eaoh basin and the quantities of water heretofore apportioned to eaoh basin by the Colorado Ri vel' Compaot. . IVhile there may be disagreement among individual states oonoerning interpretations of some provisions of the Compaot, there appears to be no basis for dispute between the two basins oonoerning these faotsl (1) by Artioles III (a) and (b) thereof, the Colorado River Compaot apportioned 7,500,000 aore 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 Artiole III (f) the Compaot speoified that, at any time after Ootober 1, 1963, if and when ei the I' basin shall have reaohed the total benefioial oonsumptive use of said quantities of water, further equitable apportionment may be under- taken of the surplus water over and above the quantities heretofore