Page 59


Page 59
Colorado River problem
Is Part Of,8
Full text
364 ALLISON ON THE COLORADO RIVER PROBLEM Construct a power plant at the point of delivery into the Alamo Canal to utilize the Mexican, as well as the American, water to generate 43,700 h.p. This power is calculated from the following factors: Delivering water from Laguna Dam to Pilot Knob at an elevation of 143.87 ft. and dropping 13,000 cu. ft. per sec. 37 ft. into the Alamo Canal. This water can shortly be sold to American and Mexican lands during part of the year and used to sluice the Imperial Valley Canals during the remainder of the year. The power developed will be delivered as follows: 8,500 h.p. to the Yuma project, as per contract of October 23, 1918; 7,500 h.p. to lift 1,300 sec-ft. of water from the new canal to the floor of the mesa at Pilot Knob to irrigate 100,000 acres of land in Coachella Valley and at Dos Palmas; 21,500 h.p. to lift 2,600 sec-ft. of water from the Alamo Canal to the floor of the mesa at the west end of the sand-hills to irrigate 200,000 acres of East Side Mesa lands in United States and Mexico. This proposed canal and power plant will cost the District $5,600,000. The advantages in this proposed work, over the All-American proposal, are that the Hanlon Heading Diversion, and the Alamo Canal through Mexico, will serve as a stand-by for the water system to Imperial Valley in case of mishap to the Laguna Dam connection. The power development is immediately greater than that developed by the All-American Canal, and the market for it is at hand, with little transmission loss and expense. As the irrigated acreage increases on either side of the International Boundary Line, so will the power development increase, while with the All-American Canal no future increase can be had and the Mexican water power is lost to the District entirely. Canal for Coachella Valley.—Lift from the Laguna-Pilot Knob Canal 1,300 sec-ft. of water for Coachella Valley and Dos Palmas. This water is to be lifted from an elevation of 143 ft. to the floor of the mesa at an elevation of 183 ft. and carried in a canal on top of the mesa in a normal cut along the northeasterly side of the sand-hills (Fig. 19), at a distance to avoid sand-drift or encroachment, to the main line of the Southern Pacific Railroad, at an elevation of 128 ft. Here, it crosses and follows a grade contour to Coachella Valley 37 ft. higher than that reached by the All-American sand-hill route. The route on this location is 13 miles shorter than by way of the sand-hill route and its higher elevation places it to greater advantage as far as storm drainage is concerned. The higher contour irrigates 23,000 acres more in Coachella Valley than the sand-hill route, making in all 100,000 acres of agri-cultural land in place of 77,000 acres as contemplated. The costs would be as follows: Pumping plant at Pilot Knob................. $ 500,000 52 miles of canal, Pilot Knob to Iris............ 1,200,000 Iris to end, including laterals................. 6,474,000 Total ............................___...... $8,174,000

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