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"Senator McfARLAND. And those are also lands upon which return water cannot be used except by pumping. "Mr. TIPTON. Well, iL would be very difficult to reuse returns from the Yuma proj ect in the United States. "Senator McfARLAND. Yes; even by pumping. "Mr. TIPTON. That is correct. "Senator McfARLAND. All right. "Mr. TIPTON. Incidentally, at the present time some of those returns are being used in Mexico by pumping. "Senator McfARLAND. So, just summing up, at the present time you have 140,000 acre-feet of returned water according to your testi- mony, which cannot be used except by pumping. Let me ask you this before we go any further. What percentage of water do you estimate the return flow to be? I mean what percentage of the water that is used do you estimate is returned? "Mr. TIPTON. We assume that there must be 2 acre-feet per acre returned in order to maintain the salt balance on the Yuma area." * * * "Mr. TIPTON. . . . "Now, continuing with my answer, which is directed at a question by Senator Mcfarland, as to the break-down of the 806,000 acre-feet. The first item is the North Gila Valley, 20,000 acre-feet; the second item was Yuma project, 120,000 acre-feet; lhe third item, the Gila project. It is estimated the return from the Gila project with 80,000 acres irrigated would be 240,000 acre-feet. That is 3 acre-feet per acre. * * * "Senator McFARLAND. That is a pretty high return flow, is it not? "Mr. TIPTON. A substantial quantity of water is required to irrigate that land. As I mentioned before, a part of that area at present is being irr-iga ted-as-a-paFt-of--the-Y:uma-project-by-pumping-;-uncterstand-;-and about 9 acre-feet per acre is being applied. The proj ect is consuming about 3 to 3.5 acre-feet per acre, so there are about 6 acre-feet per acre returning." * * * "May I read you at this moment the comment that Mr. Debler made at the time he was the Director of Project Planning for the Bureau of Reclamation. This is a memorandum to me, dated December 2, 1942, commenting on some estimates that I had made in connection with the returns from this particular area. 'Gila project: While diversion of water for the Gila project has in your memorandum been assumed at 4 acre-feet per acre, it now appears very likely that the diversion demand for the first unit will be in the neighborhood of 6 acre-feet per acre on account of the sandy nature of a very large part of the -19-