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

page 78

?8 PROBLEMS OF IMPERIAL VALLEY AND VICINITY. American) canal intercepts xne canals of the Imperial district. Two large drops (24 feet and 47 feet) will be required where the canal emerges from the mesa on the east side of the valley; at these drops power plants will be installed for irrigation pumping for Imperial mesa lands, for the Yuma project, and also for commercial power. Detail plans of. this canal may be found in the Ail-American Canal report above mentioned. For the Imperial Valley extensions the following is planned: A principal canal (line A) to divert on grade at mile 39 of the Ail-American Canal, and to extend on a grade contour along the east side of the Imperial and Coachella valleys, swinging around the north end of the latter and returning on the west side of the valley, terminating at the county line, a distance of approximately 140 miles. One long flume will be required on the east side, and two drops on the west side. Numerous washes will be crossed with concrete siphons, and smaller washes will be flumed over the canal. This xanal will irrigate about 177,000 acres, net, by gravity. r A pump canal (line D), lift 30"feet, will divert on the east mesa at mile 31 of the AU-American Canal. .This canal will run northwesterly near the edge of the sand hills for a distance of 17.5 miles to a junction with the A canal. It will irrigate 36,000 acres net in the United States and will also siphon across the All-American Canal to irrigate 8,000 acres in Mexico. A gravity diversion on the south side of the All-American Canal opposite the heading of the A canal will irrigate 8,800 acres net in the United States and also 22,000 acres in Mexico, which are above the reach of the Imperial Canal. A gravity canal (line E) will divert at mile 46 of the All-American Canal and will extend northerly for a distance of 6 miles for the irrigation of 15,700 acres net on the east mesa. On the west side, at the point whe^re the All-Ainerican Canal intercepts the old west main canal, there will be a gravity diversion (line B), which will extend northerly to the east end of Superstition Mountain, a distance of 21 miles. This canal will be run on a lighter grade than the old one, and will thereby gain an elevation of 23 feet and will also irrigate by gravity about 10,000 acres net above the old canal. On condition that the lands under the present west-side canal are willing to pay their proportion of the cost, the old canal will be abandoned and the B canal constructed with sufficient capacity for both old and new lands; if not, only sufficient capacity for the new lands will be constructed. At the end of the B canal a pumping plant will be installed, lift 125 feet, for pumping into the R canal, which will extend along the south side of Superstition Mountain for a distance of 8 miles. At the end of the R canal there will be diversions both to the north and south for the irrigation of 23,000 acres net. The R canal will require three flumes, aggregating about 1,200 feet in length. Power for the Superstition pumping plant and also for the east mesa plant will be secured from the drops in the All-American Canal. A small pumping plant may also be installed near Indio for lifting from the A canal to a height of 50 feet to cover a small area in the north end of the Coachella Valley. Surveys were not made covering this area, but it is believed of doubtful feasibility on account of the limited area of good land and to the further fact that part of the tract is now irrigated from artesian wells.