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lr.. c 00 .. C\1 '. C B. Environmental Consequences of Alternative Actions Projected CAP water deliveries to each category of use under each of the alternatives are summarized in Table 1. To ascertain the effect and significance of the different allocations, an estimate of total water deliveries was made for each entity. 1. Indian Tribes The 10 Indian reservations range in size from the 2.8 million- acre Papago Indian Reservation to the 85-acre Tonto Apache Indian Reservation. Their geographical setting is diverse, from low desert to land over timberline. While in excess of 90,000 acres have been developed for irrigation on the 10 reservations, it is estimated that 50,100 acres of land are under irrigation at the present time. An additional 28,149 acres of land could be developed for irrigation under the CAP action alternatives. The CAP action alternatives would result in new irrigation development for all tribes except the Yavapai-Prescott. Their allocation would be used in implementing portions of the tribe's development plan. New delivery systems will generally have to be constructed to transport water to the reservations' irrigation project. Although the final design and location is not set, most systems would be open concrete-lined ditches, and as necessary would include siphons and pumping stations. Much of the irrigation use of CAP water on Indian reservations would take place on lands previously developed for irrigation. However, some of these lands were subsequently abandoned and have reverted to native vegetation, and the redevelopment of this acreage would cause wildl ife habitat losses. It is also possible that the redevelopment of these lands could have adverse impacts on cultural resources that may remain partially intact. In all cases there will be a beneficial economic impact to tribes with any of the CAP action alternatives. Alternatives 3, 4, 5 and 6 provide an added significant benefit to the tribes by assuring a relatively stable and predictable water .supply for domestic and economic development on Indian reservations. By using these additional water supplies from CAP, the tribes can supplement the irrigation of the 90,000 acres of land developed on the 10 reservations and/or develop about 28,000 acres of undeveloped land. Eight reservations may also use the allocated CAP water supplies for industrial or recreati ona 1 development. In any case, additi ona 1 jobs woul d be generated, per capi ta income woul d be increased, and the 1 ife styl e of the reservati on residents would be upgraded. ~~:~~: 13