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<br />. <br /> <br />compensate for evaporation and seepage losses prior to <br />the time this water reached the head of the Mexican <br />laterals. <br /> <br />Our engineers have advised us that in their judgment <br />that would be somewhere between 20 and 30 percent addi- <br />tional, which would make somewhere between 900,000 and <br />1,000,000 acre-feet; and then in that 1929 offer further <br />they advised Mexico that Mexico in addition would get <br />the benefit of all return and excess flows reaching the <br />border, which our engineers, now--and ours agree in the <br />main here with the engineers of the International <br />Boundary Commission--that the return flow including <br />desilting water would be somewhere between a million, <br />and, some of our engineers estimate, as high as <br />l,375,OOO acre-feet return flow, depending upon the <br />points of use and the quantity of use of water which <br />we hope to use in Arizona under developments which have <br />not yet been made, and those estimates of return flow, <br />and I take it these estimates here, are the estimates of <br />the return flow which will arrive in the border reach of <br />the river below Imperial Dam, when all of us in the <br />united States have reached our full utilization of every <br />drop of water possible to be used in the United states. <br /> <br />SENATOR TUNNELL. And that is considerably in excess <br />of the amount provided for Mexico under this treaty? <br /> <br />MR. CARSON. Yes; if our engineers are right, the <br />1929 offer was less favorable to the United states than <br />this treaty." <br /> <br />P. 319 to Top of P. 320: <br /> <br />"SENATOR DOWNEY. Mr. Tipton, may I ask, is that water <br />as it would return usable water, or would it be too <br />alkaline? <br /> <br />MR. TIPTON. At the present time the water that is <br />returning from the Yuma project and being used by Mexico, <br />I believe, Senator, has some 1,500 parts of dissolved <br />solids per 1,000,000. I am not quite sure of that figure, <br />but I think that is about what it is. <br /> <br />SENATOR DOWNEY. One thousand five hundred? <br /> <br />-24- <br />