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

page 64

64 PEOBLEMS OF IMPERIAL VALLEY AND VICINITY. Rollins Ditch (including Ives heading, pumps, and ditches).-Purchased from the Greene Land & Cattle Co., July 23, 1908. This system was constructed in 1892, and on January 20, 1893, an act of Congress .was approved granting right of way for two ditch lines for the company. . Storage required.-It is assumed that the water rights of the Yuma project, as stated above, are of sufficient priority to furnish an ample supply from the natural flow of the Colorado River for the completed project, and therefore it is not estimated that any storage will be required. IRRIGATION PLAN. The irrigation plan of the Yuma project provides for the diversion of water from the Colorado River at the Laguna Dam, 10 miles northeast of Yuma,, Ariz., into a canal system heading on the California side, conveying water to the irrigable lands on that side of the river, including those in the Yuma. Indian Reservation, crossing the river at Yuma through an inverted siphon and serving lands in the Yuma Valley below' the town of YumaV The/plan also provides for large pumping plants below Yuma on the east main canal for raising.water to irrigate 45,000 acres of mesa land. The lands adjacent to the Colorado River are protected from overflow by means of levees. In addition, a drainage system is under construction and is being extended to areas in which the ground water is rising to such an extent as to threaten the lands with seepage. At the lower end of the project a large pumping plant is provided for pumping the drainage waters across the levee. rower requirement, Yuma project. Theoretic Yuma mesa pumping: horsepower. 162 second-feet, lift 80 feet............................................. 1,473 185 second-feet, lift 68£ feet............................................ 1,440 103 second-feet, lift 54.6 feet........................................___ 640 50 second-feet, lift 10 feet.............................................. 57 Total mesa pumping................,............................:___3, 610 Drainage pumping......................................................... 300 Total for project.....................................•..........___3,910 Required horsepower (40 per cent loss in pump and motor)...................6,500 It is planned to develop part of the power required for the Yuma project on the project, a small plant to be developed at the siphon drop on the mam canal, where there* is a head of about 12 feet, and a larger plant near Araz, or as an alternative power will be secured from the power plants which it is proposed to construct at the drops of the Ail-American High Line Canal. ^ THE CANAL HEADWOBKS AT LAGUNA DAM. [Extract from Report of All-Amerlcan Canal Board, July 22,1919.] The head works of the Yuma project canal are to be so modified that the diversion into a common canal will be adequate to supply the irrigation demand of both this project and the. Imperial Valley. At the point of diversion on the Colorado River, about 10 miles northeasterly from Yuma, the elevation of the water surface in the river is