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PART VI FUTURE DEVELOPMENT e There are 99,375 acres of land in Arizona, of which about 76,000 acres have been developed. The consumptive use requirement for irrigation of these lands is estimated to be 4 acre-feet per acre which would result in an annual main stream depletion of 397,500 acre-feet. The Bureau of Indian Affairs has reported a general 2,000- acre-per-year land development rate on the reservation in the past. The land development rate of 2,000 acres per year was assumed for the future even though the Bureau of Indian Affairs feels the land develop- ment rate may slow down in the near future. i. Cibola Wildlife Refuge The Cibola Wildlife Refuge has a water right reserved by Secretarial notice in the Federal Register, December 9, 1982, for 16,973 acre-feet of consumptive use per year. In 1982, the refuge used 8,250 acre-feet. By 1990 it is projected to be fully developed. j. Gila Project e The Gila Project was originally authorized to develop up to 600,000 acre-feet of consumptive use. It is now estimated that the acreage likely to be developed will consume about 450,000 acre-feet per year. The Gila Project includes the Welton-Mohawk and Yuma Mesa Divisions. The Welton-Mohawk Division, which is now authorized to develop 65,000 acres, is anticipated to consume 300,000 acre-feet. The North Gila, Yuma Mesa, and Yuma (South Gila) Irriga- tion Districts are included under the Yuma Mesa Division of the Gila Project. A total of 37,500 acres is estimated to be the average acreage developed by the districts within this division. Consumptive use would average 150,000 acre-feet per year. k. City of Yuma The city of Yuma consumptively used 8,223 acre-feet of water in 1982 and is expected to use 12,500 acre-feet by the year 1990. I. Yuma Project and Yuma Auxiliary Project e The Valley Division of the Yuma Project and adjacent land of the Yuma Auxiliary Project are anticipated to supply water to about 53,000 acres of land. About 50,000 acres are within the boundaries of the Valley Division (Yuma County Water Users Association) and about 3,000 acres are within Unit B Irrigation District (the Yuma Auxiliary Project). Estimated consumptive use will amount to 212,000 acre-feet per year. The measured return flow from lands of the Gila Project, Yuma Mesa Division, and Yuma Project, Valley Division and Unit B is 53