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0020G3 66 ASSEMBLY INTERIM COMMITTEE ON WATER The total length of the backbone canal system from the Colorado River to Tucson would extend approximately 341 miles, compared with 242 miles for the aqueduct from Lake Havasu to Lake Mathews in Riverside County, operated by the Metropolitan Water District of Southern California. The existing Salt River project storage system would be integrated with the operation of the Central Arizona Project Canal System. Additional dams would be required by the project. Maxwell Dam (1,130,000 acre-feet) on the Salt IUver would be utilized to store water in excess of that needed at Granite Reef. Buttes Dam (36G,OOO acre- feet) located on the Gila River about 14 miles upstream from Florence, Arizona; Charleston Dam (238,000 acre-feet) on the San Pedro River, southeast of Tueson, and Hooker Dam (98,000 acre-feet) on the main stem of the Gila River in Western New Mexico, would all be required to eonserve and regulate loeal water supply. It has been pointed out that a great deal of urban development has oceurred in Arizona in the last deeade, and, particularly since the 1947 report on the Central Arizona Projeet. Nevertheless, the basic purpose of the Central Arizona Projeet is to provide agrieultural water supplies. As was indieated to the U.S. Senate Committee on Interior and Insular Affairs by Commissioner Dominy: It is contemplated that approximately two-thirds of the Colorado River water diverted would be supplied for existing irrigation purposes and that about one-third would be supplied for munieipal and industrial purposes under project eonditions. This is a ehange in water use from that shown in the 1947 report as, in that report, only about 1 pereent of the projeet water was assigned for mu- nieipal and industrial use. The Central Arizona Projeet Plan docs not provide for bringing in any new lands under cultivation. All additional water would be used to supplement the demand of presently developed areas." In the area served by the Central Arizona Projeet the Bureau of Reclamation estimates a population of 1,125,000. It is estimated that there are about 1,202,000 aeres of land developed for irrigation in the area, of which an average of about 880,000 acres per year are now irrigated. This includes 75,000 acres of irrigated land on Indian res- ervations. Total estimated cost of the Central Arizona Project will be $1,101,- 331,000. According to the Department of Interior's supplemental rcport on the project: Although construction of the Central Arizona Project would generate many benefits to the States of Arizona and New Mexico, the Lower Colorado River Basin, and the nation as a whole, the principal objective of the project is the stabilization and preven- tion of retrenchment of the economy of the project area. Even with an imported snpply of water, some presently irrigated lands will eventually have to be abandoned because of water shortages, and urban developments resulting from the population increase in the area will encroach on other irrigated lands' TI Hearings on S. 1658, op. cit., at 44. 4. United States Department of Interior, 81tpplemental Report Central Arizona Proj- eot" at 56. .Tune 1963.