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. o 00 W 1",) . . HISTORY OF WATER RESOURCE DEVELOPMENT (Continued) the Colorado River system to each of the Upper and Lower Basins in perpetuity for exclusive benef'tfiJl consumptive use, a total of 7,500,000 acre-feet (9,251 x 10 m) annuallY6 3 In addition to. the apportionment of 7,500,000 acre-feet (9,251 x 10 m ), the Lower Basin is given the right to increase its beneficial consumptive use of water ~r~m the Colorado River system by 1 million acre-feet (1,233 x 10 m ) annually. The compact further provides that the States of the upper division will not cause the flow of the river at Lee Ferr% :to be depleted below an aggregate of 75 million acre-feet (92,512 x 10 m ) for any period of 10 consecutive years. One provision in the compact permits exportation of the water out of the basin as long as it is used beneficially in the seven Basin States, and another provision recognizes the obligations of the United States to the Indian Tribes. The compact prescribes the manner in which the water of the Colorado River system may be made available to Mexico under any water rights recognized by the United States. The compact, in effect, cleared the way for legislation authorizing the construction of major projects such as Boulder Canyon Project, and it also cleared the way for compacts or agreements within the Upper and Lower Basins to further divide the water among the States. 2. Mexican Treaty of 1944 The treaty with Mexico, signed in 1944, provides for the annual gu~r~nteed delivery by the United States of 1,500,000 acre-feet (1,850 x 10 m ) of Colorado River water to Mexico, This treaty does not mention water quality, and water from diffgr3nt sources had been used to supply the 1,500,000 acre-feet (1,850 x 10 m ) right. Because of this and other reasons, a problem of quality arose which had become of much concern to both countries, The quality aspects of the relationship with Mexico is covered later under "Legal Aspects, Water Quality." 3. Upper Colorado River Basin Compact With the water allocated to the Upper Basin by the Colorado River Compact and with the 1944 Mexican Treaty signed, the Upper Basin States began negotiations which resulted in the signing of the Upper Colorado River Basin Compact in 1948. Under the termt ~f the compact, Arizona is permitted to use 50,000 acre-feet (62 l< 10 m ) of water annually from the Upper Colorado River system, and the remaining water is apportioned to the other Upper Basin States in the following percentages, State of Colorado . State of New Mexico State of Utah , . State of Wyoming 51. 75 percent 11,25 percent 23,00 percent 14.00 percent 14