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, "In the future it is our belief that when the demands for water in the United States become more acute there will be no water permitted to be wasted from the Colorado River for power production. We now estimate that in the future the diversion for the Yuma proj ect will be 370,000 acre-feet, of which 235,000 acre-feet will be consumed at the land and 135,000 acre-feet will be return8d to the river as return flow. "Senator McFARLAND. That is, the Yuma project? "Mr. RITER. Yes, sir. "Senator McFARLAND. How many acre-feet did you say? "Mr. RITER. A return flow of 135,000 acre-feet. "Senator MURDOCK, It will be below any point in the United States where it could be diverted again for beneficial use? "Mr. RITER, H win be below the Imperial Dam. There might be a possibility that some of that water could be recovered by pumping. I think the previous witness stated that, "Senator MURDOCK. Excluding the possibility of pumping, is it below any point where it may be rediverted [or beneficial use in the United States? "Mr. RITER. Yes, sir. "The next project I wish to discuss is the Gila project, which is located in southwes>:ern Arizona. Construclion was initiated on this project in 1936. OrIginally the project contemplated an area of 585,000 acres, with water to be diverted from the east side of the Imperial Dam through a gravity canal which would be 21 miles long and have an initial capacity of 6,000 second-feet. From the gravity canalIS, 000 acres could be served direct. The bulk of the project area, however, would need to be served by pumping from the gravity canal. At the present time we are constructing the canal to an initial capacity of 2,200 second-feet. "As I stated before; we have to make certain assumptions to arrive at_wbaLthe-1utW:8-de.uclopment-wo..lQ-be~I-f'-the-ent-iFe-Gi-la-pro-j ect should be irrigated, the entire 585,000 acres, 'there would be no water left for Arizona to US8 in the Phoenix Valley, and we believe, there- fore, that Arizona will elect to use part of her water supply on the Gila project and part of it in central Arizona. It IS, therefore, assumed that the Gila proj ect will be developed to the extent of 160,000 acres. Of this 160,000 acres there are now 8,000 acres in the north and south Gila Valleys which are irrigated. The north Gila Valley is irrigated by gravity diversion from the Colorado River. The lands in the south Gila Valley are irrigated by recovery of ground waters, by pumping. "In the Mohawk area there was at one time 20,000 acres irrigated. These lands were irrigated by di verting the floodwaters from the Gila River, which are erratic in occurrence, and only partly irrigated by recovery of ground waters. In 1943 the area irrigated in the Mohawk Valley was only 8,000 acres. -27-