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<br />ARIZONA.. V. CALIFORNIA AND PACIFIC SOUTHWEST WATER PROBLE:M.lS 53
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<br />TABLE XI
<br />HISTORIC AND PROJECTED POPULATION ESTIMATES-UNITED STATES,
<br />PACIFIC SOUTHWEST, AND SUBAREAS
<br />
<br />(Unit: thousands)
<br />
<br /> Area
<br /> South- Total
<br /> western South- Pacific Total
<br /> Southern Southern New western Southwest United
<br />Year Arizona California Nevada Mexico Utah area States
<br />1930_____________ 436 3,000 12 3 9 3,460 123,000
<br />1940_____________ 499 4,000 20 3 11 4,533 132,000
<br />1950_____________ 750 6,000 52 4 12 6,818 151,000
<br />1960_____________ 1,~O2 9,234 131 6 12 JO,6S5 175,000
<br />1970_____________ 2,165 12,919 230 6 13 15,333 207,000
<br />1980_____________ 3.194 16,614 350 7 13 20,178 244,000
<br />1990_____________ 4,416 19.625 450 8 14 24,513 286,000
<br />2000_____________ 5,869 22,654 530 9 15 29,077 329,000
<br />2010_____________ 7,598 25,:n7 600 9 16 33,540 36S,000
<br />2020_____________ 9,654 27,616 690 10 17 37.987 401,000
<br />
<br />Source:
<br />1. Arizona. Nevada, Utah. and New Mexico data are based on projections of governmental agencies, banks. con-
<br />sultants, and other commercial concerns. .
<br />2. California-Bulletin 78. Department of Water Resources. State of California.
<br />3. U.S. Senate Select Committee on Water Resource Activities, 86th Congress, Print No.5.
<br />U. S. Bureau of Reclamation; P,lcific Southwest Water Plan, Table I.
<br />
<br />only areas having a "moisture surplus" are in Oregon and Washington.
<br />Much of the region, including areas in Arizona and southeastern Cali-
<br />fornia, are classed as dcsert and semidesert.'
<br />In spite of the lack of water, recent population growth in the area
<br />has been among the greatest in the nation. It is expected that the popu-
<br />lation growth will continue and that the area known as the Pacific
<br />Southwest, which had a population of a little over 10,000,000 in 1960,
<br />will have a population of more than 24,000,000 in 1990 and almost
<br />38,000,000 in the year 2020 (see Table XI). All economic indices with
<br />regard to employment and economic development also indicate that the
<br />area is a national leader in the economic growth rate and undoubtedly
<br />will continue such development1a Tn Chapter I the conflicting estimates
<br />of th e actual supply in the Colorado were discussed together with the
<br />various factors entering into this determination, such as estimated
<br />Upper Basin development.
<br />Turning now specifically to the Pacific Southwest and using tables
<br />incorporating both Department of Interior and Colorado River Board
<br />of California estimates, Table XII shows the estimated Pacific South-
<br />west water supply from the present through the year 2030. It can be
<br />seen by comparing lines A7 and B3 that the total supply, as estimated
<br />by the Department of Interior, is consistently more than that estimated
<br />by the Colorado River Board of California.
<br />Table XIII indicates the Department of Interior estimate of total
<br />water requirements in the entire Pacific Southwest and shows graphi-
<br />cally the extent to which southern California and Arizona uses are
<br />
<br />1 Dean Peterson, "Geological and Hydrological Considerations Relating to Western
<br />Water Supply," Western Interstate Water Conference, Las Vegas, September 16-
<br />17, 1964.
<br />la Chapter I of the Pacifio Southwest Water Plan, Report of August 1963 as modified
<br />January 1964. includes a more detailed description of many of these factors.
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