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

page 26

26 PROBLEMS OF IMPERIAL VALLEY AND VICINITY. 15. A comparison of the amount of firm power and irrigated acreage resulting from the various assumptions tabulated in connection with the 26,500,000 acre-foot reservoir leads to the conclusion that all lands in the United States and the lands under the All-American and Imperial canals in Mexico should be irrigated and that the power development should be based on the minimum irrigation discharge of 13,500 second-feet. This discharge^ with a minimum head of 360 feet, will develop 486,000 turbine horsepower of firm power. If a 31,400,000 acre-foot reservoir is provided and the same lands irrigated, the minimum discharge will be 14,300 second-feet, which, under a minimum head of 394 feet, will develop 563,000 horsepower of firm power. 16. With the 26,500,000 acre-foot reservoir the power installation would consist of twelve 50,000 horsepower vertical, variable-head turbines, direct connected to 37,500-kilowatt, 11,000-volt, 3-phase, 60-cycle generators, with necessary switching and auxiliary apparatus. . 17. With the 31,400,000 acre-foot reservoir the power installation would consist of twelve 60,000 horsepower vertical, variable-head turbines, direct connected to 45,000-kilowatt, 11,000-volt, 3-phase, 60-cycle generators, with necessary switching and auxiliary apparatus. The power house in either case would be of concrete construction located at the downstream toe of dam. 18. Switching apparatus is proposed for two circuits having capacity to transmit the full power output of the plant. Provision should be made for two future circuits. The switching apparatus and transformers would be of the outdoor type located on the plateau north of the dam at about elevation 1,600. The transformer installation would include thirty-six 14,000-kv-a., single-phase transformers with the 26,500,000 acre-foot reservoir or thirty-six 17,000-kv-a., single-phase transformers with the 31,400,000 acre-foot reservoir. In either case the generator voltage of 11,000 will be stepped up to 220,000 volts for transmission. 19. The transmission lines will probably consist of steel-core aluminum conductors on steel towers. The lines as projected will connect with the proposed California Transmission Bus near Mojave, Calif., or with a transformer station near Los Angeles. RIGHT OF WAY. 20. The information presented indicates that the right of way cost is of relatively minor importance. The small town of St. Thomas, Nev., will be submerged. With the 26,500,000 acre-foot reservoir the back water will reach up ^.he same valley to Overton, submerging a few miles of the end of the branch-line railroad and a part of that settlement. With a 31,400,000 acre-foot reservoir the town of Over-ton would be completely submerged. The submerged area of cultivated lands or of lands susceptible to cultivation is insignificant. The submerged area is generally barren desert of little value, only a small portion being privately owned. RAILROAD. 21. There are three feasible routes for a railroad to the dam site, the closest connection being from the Salt Lake route branch line from Moapa, Nev., to St. Thomas, Nev., requiring an extension of