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. ...'. ~ 00 00 .' ei ANTICIPATED EFFECTS OF ADDITIONAL DEVELOPMENTS (continued) of new and presently irrigated lands. Some 35,000 acres (14 000 ha) will be new land. This project will divert 105,000 acre-feet (130 x 106m3) of water from the Dolores River of which 81,000 acre-feet 000 x 106 m3) will be depleted and the balance returned to the San Juan River. Salt loading was determined by a special study for this project. Return flows from lands in the Montezuma Valley are presently used for irrigation of land in McElmo Canyon outside the project area. Analyses show these flows have relatively high concentrations of soluble salts but are successfully used for irrigation, because of the internal drainage characteristics of the soils. San Miguel Project, Colorado. The San Miguel Project will regulate flows of the San Miguel River for irrigation, municipal and industrial use, recreation, flood control, and fish and wildlife conservation. The project will supply water to 7,060 acres (2860 ha) of new land and 12,700 acres (5140 ha) of land now receiving a partial supply. Esti- mated depletion of Colorado River water will be about 31,000 acre-feet (38 x 106m3). Salt loading was determined by a special study. 12. Above San Juan River Near Archuleta, New Mexico San Juan-Chama Project. Construction has been completed on this transmountain diversion project. Delivery of water to the Rio Grande Basin was initiated in 1971. Average depletions from 1971 to 1978 have been about 85,000 acre-feet 005 x 106m3). The project wi 11 eventually divert an average of 110,000 acre-feet 036 x 106m3) annually from the headwaters of the San Juan River across the Continental Divide to the Rio Grande Basin. The effect of this depletion to the San Juan and Colorado Rivers will be to increase the salinity at all downstream stations. The water will be used in New Mexico for municipal and industrial developments and for irrigation. Navajo Indian Irrigation Project. Construction activities are con- tinuing on this project with some water having been delivered in 1976-77. Studies completed for the project for the all-sprinkler irrigation system indicate an agricultural consumptive use of 226,000 acre-feet (279 x 106m3). A Department of the Interior Solicitor's opinion indicates probable depletion by the Navajo Indians totaling 254,000 acre-feet (313 x 106m3) as originally authorized. It was decided for this analysis to use the 508,000 acre-feet (63 x 106m3) diversion and 254,000 acre-feet (313 x 106m~) depletion. The water would be diverted above the Archu- leta gage with return flow to the San Juan River below the gage. The 110,000 acres (44 500 ha) of new land as authorized is still considered the project area to be irrigated. Jicarilla Apache. depletion was assumed the Dulce, New Mexico~ water to supply 3,000 used for municipal and acre-feet (4 x 106m3) industrial purposes in The to be area. The effect of the San Juan-Chama and Navajo Indian Irrigation Projects and depletions by the Jicarilla Apache Tribe on the quality of water at 52