Page 76


Page 76
Colorado River problem
Is Part Of,8
Full text
LA RUE ON THE COLORADO RIVER PROBLEM 381 8.—Any development on the river that will increase the low-water flow before such increase can be used in the United States, will enlarge the irrigated area in Mexico. 4.—If the Boulder Dam is built as planned, and 600,000 h.p. is developed at the dam, the low-water flow will be increased far in excess of the quantity that can be used for irrigation in the United States for many years to come. Long before this time, it will have been put to beneficial use on approximately 1,000,000 acres of land in Mexico. Although it is physically possible for this water to be diverted at a later date in the United States, it is not conceivable that this Government would dry up 1,000,000 acres of land in Mexico without first entering into negotiations with the Mexican Government. The time to deal with Mexico is before and not after its lands have been placed under irrigation, before and not after a large dam is built in this country, which will result in the irrigation of such a large acreage in Mexico. 5.—In the distant future it may be desirable to obtain from the Colorado River a domestic water supply for the Coast cities of Southern California. There is an excellent dam site in the Lower Grand Canyon which could be used as a point of diversion for a gravity system. Although a long tunnel would be required, such a system might be the most economical. The plan for a gravity system should not be rejected by engineers who never have seen the dam site. The plan now being advocated calls for a pump lift of 1,200 ft., which requires the use of 200,000 h.p. With the Boulder Dam Project preventing the development of 800,000 h.p. (according to the author), and the domestic water supply project forever dedicating 200,000 h.p. to pumping, it must be apparent that these plans should be carefully studied before any money is made available for construction purposes. 6.—There is urgent need for flood control, and this problem should be solved as quickly as possible. For more than a year the speaker has recommended that a thorough investigation be made of the Mohave flood-control reservoir site. As a result of his preliminary studies, he has reached the following conclusions regarding this site: (a) It is the lowest known site on the river where adequate storage capacity can be obtained for flood control. (b) It would surely form a unit of a comprehensive plan for the development of the whole river. (c) It would probably cost less than any other storage site of equal capacity on the river. (d) It would not destroy other valuable dam sites. The Boulder Dam, if built as planned, would destroy certain dam sites in the Lower Grand Canyon, and prevent the full development of the water resources of this section of the river. (e) For the same storage capacity, a dam in Mohave Canyon would have about one-tenth the volume of masonry of a dam in Boulder Canyon. (f) The Mohave Canyon site is accessible, being only 2 1/2 miles from the railroad.

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