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Show THE ALLrAMEKICAIN CA2JAL. 47 On this canal stretch, at about 5 miles westerly from the mesa power station No. 1, there will be a second power station. A fall of 47 feet can here be made available. Beyond this point the construction of the canal offers no difficulties, but there will be several expensive structures required to carry the water across the deep Alamo and New River barrancas and to provide for the wastage of surplus waters. At Calexico the canal will be located 1 mile to the northward of the boundary line. It can be held at an elevation sufficient to reach the west-side canal at a point about one-half mile northward from the international boundary. A few thousand acres of ground along the boundary line on the west side will be too high to be commanded by gravity flow. For the irrigation of these lands a pumping plant will be required. The location of the canal is shown on Exhibit A, which accompanies Mr. Preston's report. On this sheet the locations of the various structures and the points at which the canal systems of Imperial Irrigation District are to be supplied with water from the canal are indicated. Thirty-seven maps on a scale of 400 feet to the inch have been prepared to show the topography along the route of the canal, but are too bulky for attachment hereto. One set will at once be furnished to the district and two sets to the Secretary of the Interior. More can at any time be made available. COMPLETION OF SURVEY. After submission of a preliminary report by this board under date of December 12, 1918, the studies in progress relating to character of material to be excavated and quantities to be handled were continued by Mr. Preston. The results of these studies have been submitted by him in a final report under date of June 17, 1919. He presents in this a revised estimate of quantities and cost, and presents the ascertained facts relating to the stratification and classification of the material dis'closed by test pits and borings. Mr. Preston discusses in this final report the possible alternative of reducing the cross section of the canal where it is in deep cut on the mesa, by lining with concrete and increasing velocity, and he gives fuller information relating to the movement of the sand dunes^ which the canal crosses. POWER DEVELOPMENT. As already pointed out, there will be opportunity for the development of power at two points on the all-American canal. At the first, or at power station No. 1, there will be a drop of 24 feet to be utilized on the canal branch which is to serve the lands in Imperial Irrigation District and which will carry, in addition, about 500 second- |
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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] : California exhibits. |