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<br />) <br /> <br />.' <br /> <br />firm conviction that there will be return flow from that area if it is to be <br />on a permanent agricultural base. We assume that there will be an annual <br />diversion into the central Arizona area from the Colorado River of 1,330,000 <br />acre-feet. <br />"Senator DOWNEY. V"hat was the first part of that statement? <br />"Mr. RITER. I merely remarked, Senator, about this morning, with <br />a previous witness there was considerable debate regarding the amount <br />of return flow from the central Arizona area. Now it is my firm convicLion <br />that there will be some return flow from that area. And then the next state- <br />ment was, sir, that in ma;~ing this study I assume that there will be a <br />diversion of 1,330,000 acre-feet from the Colorado River to the central <br />Arizona area, and of this amount there will return to the Colorado Rivcr <br />as return flow an annual quantity of 330,000 acre-feet. <br />* * * <br /> <br />"Mr. RITER. That will leave then, if we subtract those two figures, <br />a figure of 1 ,000,000 acre-feet as the amounl of water that will be con- <br />sumed in Arizona from the di\rersion from the Colorado River to the central <br />proj ect . <br />"Senator McFARLAND. Very well, go ah0ad. <br />"Mr. RITER. Now, there was another factor discussed in this return <br />flow and these seepage losses from the All-American Canal. This ccnal <br />was constructed to servc lands in the Imperial and Coachella Valleys in <br />California, and it diverts from the western end of the Imperial Dam 15 <br />miles upstream from Yuma, The lllitial capacity of the canal was 15-- <br />"The CHAIRMAN. 'liait a minute. It is not above Yuma? <br />"Mr. RITER. Yes, sir. The All-American Canal heads in the Colo- <br />rado River 15 miles upstrcam from Yuma. <br />"The CHAII,MAN. All right. <br />"Mr. RITER. I think, S.:mator, you have in mind the canal below <br />Yuma, as the old canal that used to be. <br />"The CHAIRMAN. The_olct--<:@m be.low_Yuma.. <br />"Mr. RITER. The old dum that used to serve the Imperial Valley, <br />but that has been replaced by this All-American Canal, which was placed <br />in operation in 1941. The initial capacity of this canal is 15,155 second- <br />fect. 2,000 second-fcct of this capacity is to carry water for the Yuma <br />proj ect, and that extends for 15 miles. For the next 6 miles on, the <br />capacity is 13,155 second-feet, which capucity is maintained to a point <br />called Pilot Knob. At Pil.ot Knob the canal runs west for 59 miles into <br />Imperial Valley. The capacity west of Pilot ;(nob is 10,155 second-feet. <br />At this point I would like to mention that 155 sccond-feet of capacity was <br />constructed in the All-American Canal at the request of the city and county <br />of San Diego. <br />"The bottom width of the canal is 160 fcet. That is at the head <br />end, and it will havc, whcn running full, a water depth of 21 feet. <br />Now, we estimate that there will be a seepage loss of 65,000 acre- <br /> <br />-30- <br />