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<br /> <br />ECONOMIC PROJECTIONS <br /> <br />Two of the most important constraints in this study are: <br /> <br />1. Projections of regional growth and development are generally <br />constrained in accordance with national projections developed <br />by the Departments of COIlll1lerce and Agriculture (Office of <br />Business Economics and Economic Research Service). These <br />projections were modified by the States of the Lower Colorado <br />Region to reflect to local conditions and trends. <br /> <br />2. Legislative constraints and the guidelines for framework <br />studies prohibit study of importation of water among areas <br />under the jurisdiction of more than one river basin cOIlll1lission <br />or interagency cOIlll1littee. For these studies, desalting of <br />sea water and further exploitatlon of ground water were <br />considered the principal sources of additional water supplies <br />for the Region and are the bases for the general magnitude of <br />costs presented in this ;report. Costs presented also inc1:l1de <br />those for local water supply developments, vegetation manage- <br />ment, and facilities for conveying Colorado River water to <br />central Arizona and southern Nevada. <br /> <br /> <br />Phoenix, Arizona, experienced a phenomenal population growth of 540 percent <br />between 1950 and 1970 while expanding in area from 17 to 250 square miles. <br />Maricopa County showed a population growth of 280 percent during the same <br />period. 8 <br />