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Show 150 PROBLEMS OF IMPERIAL VALLEY AND VICINITY. With the exception of the last two, there are no conflicts in water supply and, in this case, ample storage for the lower diversion will insure effective utilization of available supply. Where natural flow is insufficient, for the other projects, storage is usually provided for with the result that all of the above projects may be expected to average 2 acre-feet per acre diversion of which 1.25 acre-feet would be consumed. The Dolores and Montezuma projects lying outsi'de the Dolores drainage area will entail a total loss equal to their diversions and anticipated transmountain diversions near Ridgeway will take an amount estimated at 15,000 acre-feet annually. Water-supply conditions for the Dolores drainage as a whole for the future are estimated as follows: Present outflow from Dolores River: Acre-feet. Dolores at Bedrock (1918-1920)...................................... 357,000 San Miguel at Naturita (1918-1920)................................... 272,000 Inflow below Naturita and Bedrock (estimated)....................... 101,000 Total present outflow..................,.......................... 730,000 Future additional diversions: Dolores and Montezuma projects: 105,000 acres at 2 acre-feet........... 210,000 Other projects within basin: 139,000 acres at 1.25 acre-feet............. 174,000 Transmountain diversions to Gunnison............".................... 15,000 Total future abstractions........................................... 399,000 Expected future outflow..........,................................ 331,000 Return flow from diversions to the Gunnison River Basin would decrease losses for the Dewey reservoir from 399,000 acre-feet annually to 395,000 acre-feet. Return flow from the Dolores and Montezuma projects would add 63,000 acre-feet annually to the San Juan above Bluff, making a net loss to the Colorado below the mouth of the San Juan of 332,000 acre-feet annually, due to operations in the Dolores drainage. SAN MIGUEL PROJECT. Present irrigated area, 1,000 acres; additional irrigable area o0,000 acres. Mean annual temperature, 47° Mean annual precipitation, 15 inches. Mean precipitation during growing season, 8 inches. Elevation, 6,000-6,500 feet. Interval between killing frosts (summer), 130 days. Transportation, Denver & Rio Grande narrow gage; nearest station, Placerville, .40 miles from heart of project. Irrigation plan.-The project consists of two independent units. The Nelson ditch, heading in Beaver Creek, covers 10,000 acres lying west of Beaver Creek northwest to the San Miguel River. This canal has been constructed with a length of 30 miles, but the system requires storage in Beaver Park to provide the required water supply. It is being operated to provide water for old rights. The San Miguel ditch heads in San Miguel River 7 miles below Placerville, and with a length of 50 miles covers 50^000 acres south and west of Norwood. Short feeders also bring into the main canal unused waters from Beaver and Saltada creeks. The main canal |
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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] : |