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Show PART XI PROJECTED WATER USE Total depletions of municipal and industrial water in gallons per capita per day (gpcd) average 147 in the Green River, 166 in the Main Stem, and 112 in the San Juan, with an average for the region of 136 gpcd. Projected depletion by the Navajo Indians by 2020 would average about 65 gpcd. This is in contrast to the present and projected depletion rate at Page, Arizona, of about 500 gpcd. Thermal-Electric Power The 2020 water depletion by steam-electric generation plants is estimated at 626,600 acre-feet. Nearly all consumptive use is for condenser cooling purposes. Power production by 2020 by states and for the region is estimated as follows: Arizona - 2,310 MW; Colorado - 16,976 MW; New Mexico - 7,123 MW; Utah - 5,759 MW; Wyoming - 9,913 MW; Region - 42,081 MW. This distribution among the States resulted from arbitrary assignments to conform with state compact allotments for the purpose of this study only. Minerals Projections of mineral production totaling $2,014,000 would require a depletion of about 52,800 acre-feet in 2020. Projected depletions for water injection in oil fields in New Mexico are not included in this estimate. Augmented Fish and Wildlife The projected consumptive use comprises 127,400 acre-feet from the fish and wildlife facilities which will be required to satisfy future demand. This total represents 11,700 acre-feet of on-site depletions occurring in 1965 plus amounts of 88,000 acre-feet needed for waterfowl and 27,700 acre-feet needed for fish by the year 2020. The consumptive use is based on depletions from 51,200 surface acres of facilities intended primarily for fish and wildlife. It is reasonable to suppose, however, that multi-purpose facilities, not yet planned or authorized, may become available to meet part of this future demand. Water-supply restrictions based on compact limitations for those parts of Arizona and New Mexico in the Upper Colorado Region will become a major problem in attaining the future development needed in this part of the region. For the purpose of this study fish and wild- life water usage at the year 2020 has been reduced from 12,200 acre- feet to 1,200 acre-feet for Arizona and"from 35,300 acre-feet to 6,800 acre-feet for New Mexico. There may be a possibility of obtaining additional water in future years through the commitment of undeveloped water or the purchase and transfer of water developed for other purposes. 50 |
