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<br />00152~ <br /> <br />r' <br />I <br /> <br />The general combination of high temperatures and low humidity in the <br /> <br />Lower Region causes high rates of evaporation and transpiration <br /> <br />resulting in the depletion of more than 95 percent of the precipita- <br /> <br />tion before it can reach streams or percolate to ground-water <br /> <br />Demographic Characteristics <br /> <br />II <br />tej <br />I <br /> <br />reservoirs. <br /> <br />The Service Area, with the exception of Southern California, is <br /> <br />characterized by three metropolitan centers, Las Vegas, Phoenix, <br /> <br />t <br />i <br />l~ <br /> <br />and Tucson, with sparsely populated expanses in between. The <br />population of this area is projected to be nearly 2,700.000 by <br />1980 (WRC-1972 OBERS). Incl udi ng the densely popul ated southern <br /> <br />California coastal area, the Service Area population is projected to <br /> <br />be nearly 17 million by 1980. This would constitute over half the <br /> <br />ll~ <br />fll1 <br /> <br />population of the 11 western states, <br /> <br />Economic Development <br /> <br />Major earnings are derived from manufacturing which is expected <br /> <br />, ' <br /> <br />to continue to lead as the major source of income through 2000. <br />Immigration of people to the Lower Region has been primarily <br />influenced by the availability of land suitable for many uses, <br /> <br />rich mineral resources, and an attractive mixture of scenery and <br /> <br />climate, <br /> <br />7 <br />