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<br />there w~ll only be thut much water? That is what I am thinking of-- <br />,his ultimate that may never happen. It may be 50, 80, or 90 years <br />from now; maybe never; I do not know. But the upper basin has a right <br />under the compact, under the primary allocation, to consume 7,500,000 <br />acre-feet. The upper busin produces almost all the water of the stream <br />that formerly reached the boundary. <br />"The virg in flow Ul Lee ferry is estimated at 16,27 I ,000 acre-feet. <br />In order to consume 7,500,000 acre-feet out of that, the upper basin <br />must divert the entire [low several times, so what finally will reach <br />the lower basin will not be virgin water; it will be water that has been <br />used several times, so that lhe quality of wuter-- <br />"The CHAIRMAN. Thut is on the assumptlOn, however, that the <br />upper basin will utilize its full quota? <br />"Mr. TIPTON. Yes, sir. Much of the water reaching Lee Ferry <br />at the present time, of course, is return flow from the present irrigated <br />areas in the upper basin. <br />"Therefore, insteud of having water at the point of diversion for <br />central Arizona that is of equal quality with the water being used in <br />centra 1 Arizona at the present time, it will be of poorer qua lity. It <br />will not be virgin flow. The crIterion used to delermine the estimated <br />amount of return flow thut will get back to the stream in Arizona was <br />3,000 parts per million of dissolved solvents. It was assumed that <br />that water would be used and reused in Arizona to the extent that it <br />got boiled down to a dissolved solid content of 3,000 parts per million. <br />'''Further, it was assumed that there would be 25 or 30 percent of <br />the water lost in transit before it got to the main stream and that the <br />amount that ultimately flowed into the main stream would be 426,000 <br />acre-feet, which would contain some 4,000 parts per million." <br /> <br />After a discussion concerning the quality of water, Mr. Tipton returns to the <br /> <br />discussion of the quantity of water to be delivered to Mexico by return flow, operation <br /> <br />of desilting works, etc. at page 334. <br /> <br />"Mr. TIPTON.. . . <br />"Just to complete your line of thought as to the amount of water <br />that would be there without any water from central Arizona, you must <br />add the desilting water; Llwt is, water which is used at Imperial Dam <br />for desilting purposes. That at one time was estimated by the Bureau <br />of Reclamation to be 387,000 acre-feet, I think. <br />"Senator McFARLAND. For de silting purposes? <br />"Mr. TIPTON. Yes; but to be conservative, that estimate has <br />been reduced to 1 00,000 acre-feet. <br />"Senator McFARLAND. Where does that come from? <br /> <br />-23- <br />