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" '.' "Senator McFARLAND. Right there, !vir. Riter: You mean by recovery of ground water, pumping? "Mr. RITER. Yes, sir. "Senator McFARLAND. That is water that is 12,000 parts per million? "Mr. RITER. Yes, sir. "Senator McFARLAND. And one of the reasons why that acreage has decreased is on account of the quality of the water? "Mr. RITER. Yes, sir. That is the si'lualion. "Senator McFARLAND. Very well. "Mr. RITER. The total area of 160,000 acres, which we assume will be irrigated in the Gila project, will require a diversion of 960,000 acre-feet per year from the Colurado River. Of that 960,000 acre-feet the consumptive use would be 560,000 acre-feet, and the return flow which will enter the Colorado Ri ver will be 400,000 acre--feet. This return flow will very largely initially enter the Gila River and return to the Colorado River through the Gila. "The Gila Ri ver emptIes into the Colorado River near Yuma, and some of the return flow 0.1: ,he Yuma mesa just immediately west of the Yuma project, and whose lands are quite sandy, will percolate down into the Colorado Ri'/er direct, not through the Gila. "The next project to be discussed is the central Arizona project, which is located in the Phoenix basin. "Senator McFARLAND. Before you get to that, how much did you estimate would be return flow from the other projects? "Mr. RITER. 135,000 acre-feet from the Yuma, and 400,000 acre- feet from the Gila. "Senator McFARLAND. That is a total of how much? "Mr. RITER. That is 535,000 acre-feet. "Senator McFARLAND. All right. Now, horn that water you esti- mate that none of 'it can be reused except by pumping it in the All- American CanaP "Mr. RITER, V/ell, I would not restrict it exactly to the All-American CanaL It might be possible that some of it might be pumped into the Yuma project canal. "Senator McFARLAND. That would be a very small amount? "Mr. RITER. It would have to be pumped in any event. "Senator McFARLAND. Of course as you get on down, the possi- bilities for pumping are reduced because you haven't any land left to pump to at the end of the project? "Mr. RITER. Tha'L is right. The Bureau of Reclamation in cooperaUon with the State of Arizona. is now investigating the possibilitles of bringing water from the Colorado River to serve the central Arizona area. There is now irrigated in that area in excess of 500,000 acres of land. These lands are being irrigated from the Gila River and i'ts principal tributaries, the principal tributaries of which are the Sale River and the Verde River. The -28-