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Show 134 PROBLEMS OF IMPERIAL VALLEY AND VICINITY. However, if the extraordinarily high year of 1909 is deducted, the average for the remaining five years is 88 per cent of the long average on the Duchesne River, and this will represent more nearly what the actual supply is.. The following table gives this average, while the demand is the diversion for 57,300 acres irrigated in 1918 as given by Federal court commissioner: Estimated average annual discharge. Supply. Demand. Total. Per acre. Surplus. October to April. May............. June............. July............. August.......... September....... Acre-feet. 98,000 Acre-feet. Acre-foot. 56,000 59,000 32,000 24,000 20,000 25,000 0.44 50,000 .88 25,000 .44 15,000 .26 5,000 .09 Acre-feet. 98,000 31,000 9,000 7,000 9,000 15,000 The irrigable area is stated by Parkhill to be 66,000 acres. The draft of 1918 is probably less than for most years because there was a shortage of water. However, on Ashley Creek the average supply after July 1 is only 0.6 acre-foot per acre. If this same ratio could be ultimately attained in the TJinta and Whiterocks basins, the area irrigated would be 120,000 acres. Conditions are different in the two basins. Return flow is not all available in the latter and some of the irrigable land is bench land. It seems probable that the acreage from the river direct without storage can be increased to not more than the 66,000 acres given by Parkhill. There is also possibility of extending by storage. One off-stream reservoir site of approximately 12,000 acre-foot capacity has been located near the center of township 6 north, range 1 east, and by use of this, replacement storage can be provided for a diversion of direct flow farther upstream. This water can be taken to 12,000 acres east of Duchesne River, called Colorado Park, although construction of such a project will be difficult. The average supply noted in the foregoing table shows that there is ample supply for the reservoir and there is a possibility of securing some storage in small lakes at the headwaters. Estimated acreage. Acres. Present irrigated,.........................................................57,000 Increase without storage........-.......................................... 9,000 Increase with storage..................................................... 12,000 Total ultimate..................................................... 78,000 DRY GULCH. From Dry Gulch there is an estimated 10,000 acres irrigated at present without possibility of increase. |
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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] : |