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double accounting: Navajo Reservoir evaporation, 31,000 acre-feet; Hammond Project irrigation, 10,000 acre-feet; and Four Corners Powerplant, 15,000 acre-feet. ~ ~ -..J c..r, b. Miscellaneous Additional Depletions These are depletions that have come into being since the Comprehensive Framework Study estimates were prepared. These include 5,000 acre-feet of private rights developed for municipal and industrial purposes. Values shown were developed from data provided by the New Mexico Interstate Stream Commission. c. Navajo Reservoir Evaporation Reservoir evaporation is based upon a 60-year Colorado River Storage Project sequence study made in 1973. d. Animas-La Plata Project (Colorado-New Mexico) Reclamation estimates a depletion level of 10,000 acre-feet by 2000 and 34,000 acre-feet by 2010. See the discussion of the Animas-La Plata Project in the Colorado section. e. San Juan-Chama Project The San Juan-Chama Project was authorized by Public Law 87-483. Transbasin diversions began in 1971. The May 1957 Supplemental Project Report indicates that diversions are expected to average about 110,000 acre-feet a year, although more recent hydrologic studies performed by the Southwest Regional Office indicate that the long-term average annual yield may be closer to 104,000 acre-feet. Historical (1971-83) average diversion has been 99,640 acre-feet a year. For purposes of this report 110,000 acre-feet have been selected as the level of existing and future average depletions. f. Navajo Indian Irrigation Project Various estimates for projected agricultural use depletions have been prepared, including the studies for the all-sprinkler irrigation system for the Navajo Indian Irrigation Project prepared by the Southwest Region of the Bureau of Reclamation. This study estimated agricultural consumptive use of 226,000 acre-feet. Several other estimates have been made, and a 5-year field study to determine actual consumptive use on the project was begun in 1978 and recently concluded. Recent technical estimates reported by the Secretary of the Department of the Interior Report, Economic Study, May 1980, are 254,000 acre-feet for agricultural depletions. In November 1981 it was concluded and agreed by the Assistant Secretary, Department of the Interior, Land and Water Resources, and Assistant Secretary, Department of the Interior, Indian Affairs, that the productive acreage of the project should be 110,630 acres, rather than the 105,000 acres which had been assumed in the past. Correspondingly, the annual depletion estimate has been revised from 254,000 acre-feet to 267,000 acre-feet. The first block of land (about 9,300 acres) was irrigated in 1976. In 1985, Blocks 1 through 5 were in production and some water had been delivered to Block 6. Historical net diversion from Navajo Reservoir in 1985 was 131,815 acre-feet, rounded to 132,000 acre-feet for the report. Some VI-9