OCR Text |
Show PROBLEMS OF IMPERIAL, VALLEY AND VICINITY. 123 Main canal for project diverts from Slater Creek 6 miles below reservoir and reaches irrigable lands after crossing Willow Creek at thirteenth mile. Supply canals from the headwaters of Elkhead Creek are also proposed to feed the Columbus Mountain reservoir site. Lengths of canals are as follows: Miles. Feeder from Elk River to Little Snake River................................. 27 Feeder from Little Snake River to Columbus Mountain reservoir site........... 30 Supply canal to project...................................................... 13 Main canal on project................................•....................... 105 Irrigable lands.-These consist of an estimated total of 165,000 acres out of a gross area embracing 275,000 acres. The lands are fertile but rolling and eroded. Duty of water.-Is 2.50 feet at diversion. May......................................................................0. 40 June.......................................................................85 July.......I....................................................,...........75 August................................................v.....................40 September...................................¦..............................10 Total................................................................ 2. 50 WATER SUPPLY. Elk River headwaters.-Average discharge at Hinman Park, April to October, is 128,000 acre-feet. The discharge available to the pickup canal is larger because Hinman Creek and South Fork are not included; that is, some of the less prolific territory tributary to the gaging station lies below the canal, while more prolific territory discharging below the gaging station is reached. The April to October supply available to the feeder canal may be 150,000 acre-feet. Diversion can hardly start before May 1 and will end about November 1, which subtracts 16,000 acre-feet from the above amount. Losses due to peak discharges greater than the economical section of the canal may amount to 24,000 acre-feet, leaving 110,000 acre-feet available for the project from this source. Snake River headwaters.-The water from Elk River is carried to the Snake River slope and into the Red Park reservoir (proposed) of 47,000 acre-foot capacity on Middle Fork of Little Snake. Little Red Park, of 12,000 capacity on Independence Creek, can be used to regulate the supply from that creek. From these two creeks a supply canal, also tapping the South Fork of Little Snake, will carry the water to Columbus Mountain reservoir site. With the regulation provided by the reservoirs practically all of the summer run-off from the 54 square miles intercepted can be carried to Columbus Basin reservoir site. The annual discharge at the gaging station from 160 square miles is 122,000 acre-feet, or 800 per square mile. It is believed that from the higher 54 square miles it will be 50 per cent more per square mile, or, say, 75,000 acre-feet. Because of reservoir control practically all, or, say, 70,000 acre-feet, is divertible. Slater Creek.-The run-off is 61,000 acre-feet, of which probably 40,000 acre-feet is tributary to the project. The Columbus Mountain reservoir site is on this creek; capacity, 76,000 acre-feet, and will be used to control the entire discharge above and from the South Fork and Elk River supply canals. |
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Original book: [State of Arizona, complainant v. State of California, Palo Verde Irrigation District, Coachella Valley County Water District, Metropolitan Water District of Southern California, City of Los Angeles, California, City of San Diego, California, and County of San Diego, California, defendants, United States of America, State of Nevada, State of New Mexico, State of Utah, interveners] : |