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<br />OD2559 <br /> <br />Indian reservations which have a very limited development. The <br />population and economic growth of the area have been small com- <br />pared to the central portion of the State. The pressure of the <br />growing urban population to the south for recreational facilities <br />is being felt, emphasizing the need for an overall development of <br />the Little Colorado River tributary system. <br /> <br />Central Arizona for many years has sought to supplement locally <br />ava.ilable water supplies with Colorado River water. The most recent <br />plan to furnish supplemental water is known as the Central Arizona <br />Project which was developed by the Bureau of Reclamation and pub- <br />lished in H. D. 136, 81st Congress, 1st Session. In recent years, <br />the plan has been updated to reflect current costs and conditions. <br />Arizona sought to have the Central Arizona Project authorized <br />more than a decade ago but was forestalled in its attempts to <br />obtain Congressional authorization because of the conflicting <br />claims of the States of the Lower Basin to the use of the waters <br />available from the Colorado River. During the last decade the <br />population of Arizona has doubIed and the metropolitan areas of <br />Phoenix and Tucson have grown more than twice as fast as the State <br />as a whole. The water needs of the area have grown proportionately <br />and now far exceed the water supplies available locally. <br /> <br />The Central Arizona Project provides for pumping Colorado River <br />water from Lake Havasu through an aqueduct system designed to serve <br />the Phoenix metropolitan area and the area south thereof to Tucson. <br />Colorado River water would be delivered directly to the cities and <br />agricultural areas within central Arizona to provide supplemental <br />and replacement water. The replacement water would be needed to <br />offset currently used local supplies which would then in turn be <br />diverted to other areas in the State to meet local needs. The <br />bulk of the water supplies available to central Arizona have long <br />been appropriated by the areas to be serviced with water diverted <br />from the Colorado River. The only way in which areas outside central <br />Arizona could intercept and use waters already appropriated for <br />uses in central Arizona would be through water exchange agreements. <br />These water exchanges would be accomplished by delivering replace- <br />ment water from the Colorado River to the users in central Arizona. <br />The local areas could then intercept locally .available waters and <br />use them without damaging the areas holding the prior rights thereto. <br /> <br />Since the opinion of the Supreme Court in the case of Arizona <br />v. California-, et al, Arizona plans to seek authorization for the <br />Central Arizona Project for the benefit of the State as a whole. <br />While the Central Arizona Project would provide approximately <br />1,200,000 acre-feet of supplemental and replacement water to central <br /> <br />11-10 <br />