OCR Text |
Show PART V REGIONAL NEEDS AND DEMANDS Adequate waste treatment facilities will be required to service present development. Control measures will be required to prevent fertilizers, pesticides, and other pollutants from entering the stream system. Main- tenance of minimum flows for water quality, fish and wildlife, recreation, and other uses is desirable in some areas. Thermal pollution has been minor to date. However, heat output from thermal powerplants is expected to increase 30 times. This tremendous amount of heat must be managed to protect the temperature for fish and for water self-purifications. There is great need for increased surveillance and emphasis in the areas of domestic water, air pollution, solid waste disposal, radiologi- cal pollution, and disease vectors. Particular attention would be given to control of stack emissions from thermal-generating plants and effluent from mineral processing to prevent degradation of the environment. Restoration of disturbed mining areas and control and stabilization of the tailings piles are necessary to reduce erosion and the contamina- tion of water courses by the radioactive materials and heavy metals trans- ported with the sediments. Export (Water) Water* export demands by the year 2020 from adjacent regions within compact limitations will result in increased transmountain diversions of 1,102,200 acre-feet by Colorado, New Mexico, Utah, and Wyoming. Water Requirements By ttie year 2020 there would be on-site depletion needs of 6.55 mil- lion acre-feet. The largest consumptive use need, which is 50.3 percent of the total in 2020 or 3*29 million acre-feet, is for irrigated crops, associated seeped and phreatophyte areas incident to irrigation and irri- gation reservoir evaporation. Minor water needs in 2020 are in municipal and industrial water sup- ply (1.7 percent), minerals (0.8 percent), augmented fish and wildlife and recrea-tion (l.k percent), stock-pond evaporation and livestock use (0.9 percent), and thermal-electric power generation (9*6 percent). About 1.65 million acre-feet (or 25.2 percent of the 2020 depletion) would be exported. Main stem regulating reservoir evaporation would account for 10.1 percent or 660,000 acre-feet of depletion. Table 5, and the four figures following page 58, present stream depletions for the five states and three subregions by types of needs for I98O, 2000, and 2020. |