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<br />001151 <br /> <br /> <br /> <br />part of the region. One of the characteristics of these rivers is that they all flow into <br />terminal sinks with no outlet to the sea. The largest of the terminal sinks are Great <br />Sal.t' Lake and Sevier Lake in Utah, Pyramid Lake, Carson Sink and Walker Lake in <br />Nevada. . <br />Since most of the precipitation occurs in the mountainous areas along the eastern <br />and western boundaries of the region, water is not always available where needed. <br />This problem points up the need for structures to make the water available at the <br />location of need. Present fresh water storage capacity of lakes, ponds and reservoirs <br />totals approximately 35 million acre feet. <br />On-site depletions of water at the 1965 level of development related to man's <br />activities in the region were 5.6 million acre feet, or approximately 57 percent of the <br />annual water supply. A breakdown by ,use is discussed later in the plan. <br />Quality of surface waters is generally excellent in the upstream portions, but de- <br />teriorates in the downstream reaches. Surface waters near the terminal lakes contain <br />concentrations of total dissolved solids usually in excess of 1,000 parts per million. <br />Although the quality of ground water varies considerably throughout the region, it is <br />generally good. Poor quality water could be reclaimed for municipal and industrial <br />or agricultural use by appropriate treatment. <br /> <br /> <br />Water fol' Irrigation and Recreation <br /> <br />.. <br /> <br /> <br />WaleI' Supply <br /> <br />, . <br /> <br /> <br />, <br />. ,.,~f <br />\ <br /> <br />Snowpack <br /> <br />15 <br />