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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />II <br />I <br />I <br /> <br />o <br />~ <br />en <br />w <br /> <br />-39- <br /> <br />in the UCRB (Gardner and stewart, 1978). About 99 percent <br />of the irrigated land is served entirely by surface water <br />supplies. Figure 8 indicates the extent of irrigation <br />development in the basin. <br />Energy Development <br />USDI (1974) states that, although salinity is presently <br />the most serious water quality problem in the Upper Colorado <br />River Basin, energy development also presents some poten- <br />tially serious problems. Additional municipal and industrial <br />wastes, sediment, heavy metals, toxic materials, and unde- <br />sirable bacteria, temperature and dissolved oxygen content <br />levels in the streams and rivers pose future concerns for <br />the basin. without strict monitoring and enforcement of <br />existing water quality laws, localized problems, in addition <br />to salinity, such as sediment production, can be expected to <br />occur on the minor tributaries. <br />Because of the present energy shortage, the slow <br />development of solar power, and the long delays in nuclear <br />power plant construction, the use of the large coal (Fig. 9) <br />and oil shale (Fig. 10) deposits in the Upper Colorado River <br />Basin appear critical to the nation's energy needs. Other <br />significant energy resources are uranium (Fig. 11) and tar <br />sands deposits (Fig. 12). <br />Corsentino (1976) presented a listing of known planned <br />and proposed energy developments in the western United <br />States (Table 2), including 125 areas located in the Colorado <br />River Basin. There have been other projects proposed and <br />