Page 77


Page 77
Colorado River problem
Is Part Of,8
Full text
382 DAVIS ON THE COLORADO RIVER PROBLEM (g) Considerable quantities of sand and gravel, suitable for concrete, are available close at hand, and the granite in the abutment walla will provide excellent material for crushed rock. (h) The depth to bed-rock is probably not great; the center pier of the Atchison, Topeka and Santa Fe Railway Bridge, 2 1/2 miles above the dam site, is resting on bed-rock 70 ft. below the water surface. (i) With the flood problem solved by a dam at Mohave Canyon, there will be ample time for studying the river and no necessity for proceeding except in conformity with its orderly economic development. The speaker would make the following recommendations: 1.—A thorough investigation should be made of the Mohave Canyon flood-control reservoir site, including detailed surveys and diamond-drill borings. If suitable foundation is developed, a flood-control dam should be built at this site and operated in such a manner as to prevent any increase in the irrigated area in Mexico. 2.—While investigations are being made at the Mohave Canyon flood-control site, and during the construction of a flood-control dam, negotiations should be carried on with the Mexican Government with the idea of definitely fixing the quantity of water which is to be allotted to the lands in Mexico. 3.—Prior to a definite settlement with the Mexican Government, it would not be good business to permit the construction of a power dam on the Colorado River, which would increase the low-water flow of the river in excess of the quantity necessary to supply the land now under irrigation. 4.—While the flood-control dam is being built, and negotiations are being carried on with Mexico, the investigation of the Colorado River Basin should be continued, with the idea of evolving a comprehensive plan for the development of this river. 5.—If the resources of this great river system are to be developed in an orderly manner, a comprehensive plan of development must be made and agreed on by the Interior Department, the War Department, and the Federal Power Commission. Each development on the river should be a unit of this plan. Arthur P. Davis,* Past-President, Am. Soc. C. E.—In this interesting paper the author presents some pertinent facts, and reaches important and far-reaching conclusions, some of which, if carried out, would result in the unnecessary destruction of large natural resources of land, water, and power. For this reason the speaker feels compelled to dissent from these conclusions and to give his reasons therefor. The speaker is in accord with several of the author's maxims, as follows: 1.—No complete and inexorable plans for the development of the Colorado River should be adopted until more is known about the river, and the requirements of the future. 2.—No unnecessary evaporation should be involved. * Chf. Engr. and Gen. Mgr., East Bay Municipal Utility Dist., Oakland, Calif.

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