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20 <br />• and Lower Basin States were given 7.5 MAF. The compact further provided that 75. <br />MAF must be delivered to the Lower Basin in any 10 consecutive year period. This <br />required Upper Basin States to absorb any losses due to low flow conditions. The <br />compact also provided for indian tribal water obligations (Bishop and Porcella <br />1980) and for delivery of water to Mexico should a treaty be passed <br />The Mexican Water Treaty of 1944 requred the delivery of 1.5 MAF per year <br />to Mexico. Lesser amounts could be delivered in years of drought if reductions <br />were proportional to consumptive use reduction in the United States. <br />The Upper Colorado River Basin Compact of 1948 apportioned water given <br />to the Upper Basin by the Colorado River Compact as follows: <br />Colorado 51.75% <br />• New Mexico 11.25% <br />Utah 23.00% <br />Wyoming 14.00% <br />Arizona was given a right to 50,000 acre-feet annually from the Upper Colorado <br />River system. These rights are for consumptive use, and the states may divert <br />more than their entitlement if return flows are sufficient to make up the delivery <br />requirments of the Lower Basin and Mexico (Harris et al. 1982). <br />By dividing flows between States in the Basin, the Colorado River Basin <br />Compact and Upper Colorado River Basin Compact cleared the way for Congress <br />to enact the Colorado River Storage Project Act. Enacted in 1956, the Colorado <br />River Storage Project Act provided for the construction of six reservoirs: Lake <br />0