AZ vs. CA:24 California Exhibits, Vol. XXIV; Miscellaneous

page 125

PROBLEMS OF IMPERIAL VALLEY AND VICINITY. Demand, 140,000 acres; duty, t.5 acre-feet at diversion. 125 Supply. Demand. Deficiency. Reservoir contents end of period. 1 In June supply would exceed demand in early days of month, making reservoir capacity necessarily greater than shown-say, 100,000 acre-feet. The following reservoir sites are available: Columbus Mountain.*___,.......„..,.......................... ..*>....:..* 76^000 Little Red Park...........¦......................................_____:..j. 12,000 Big Red Park.................................:...........:........._.. 47,000 Total:............................................................. 135v 000 Other reservoirs may be found on the project and there is a small one below Columbus Mountain reservoir on Slater Creek. The capacity noted is not sufficient to give good carry-over to dry years and if more are not found the average supply will be less. The foregoing outlines an ultimate possibility, but construction in its entirety is not feasible now and estimates of water supply may be grossly in error. . The project divides itself readily into two units, whiclr may be constructed separately. No. 1 contains 75,000 acres of irrigable land from Slater Creek west to the west line of range 92. The remaining 65,000 acres are covered by extending the main canal of the first unit. UNIT NO. 1. General statistics are same as for the entire project. Irrigation plan.-Use of Columbus Park reservoir with such feeders as are necessary to gather the water. Assumed duty (acre-feet per acre). May.....................................„w...........___................. 0.-30 June.................................................-----...............^ 70 July........................................................................ 60 August and September..........................................*............40 Total........................................................-.......2. 00 Note.-Duty assumed smaller because less extensive feeder canals are required than for the entire project. Total required, 150,000 acre-feet This project has almost reached the construction stage as a Carey Act project, at an estimated cost of $55 per acre, and it is considered entirely feasible by State officials. The General Land Ofiice has reduced the project to 44,000 acres, with a duty of 1.67 acre-feet at diversion, requiring a total of 75,000 acre-feet. Based on the foregoing estimates of water crop from different areas 67,000 acre-feet could be gotten from the last three items in the table and the 93715-S. Doc. 142, 67-2-11