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I <br />provided that before it became effective all seven states had <br />to ratify the Compact, or that six states, including Califor- <br />nia, ratify and that California also enact legislation <br />confining itself to no more than 4.4 m.a.f. (million acre-- <br />feet) of the 7.5 m.a.f. apportioned to the, lower states by <br />Article III(a), plus not more than half of the surplus water <br />unapportioned by the Compact. It also pre-approved any <br />compact which Arizona, California and Nevada might enter into <br />apportioning 300,000 acre-feet of the Article III(a) water to <br />Nevada, 2.8 m.a.f. to Arizona, and 4.4 m.a.f. or less to <br />California, allowing Arizona exclusive beneficial use of the <br />waters of the Gila, and exempting the Gila Arizona's tribu- <br />taries from any obligation to supply water to Mexico under <br />Article III(c) and requiring that the Mexican burden be <br />fulfilled equally by California and Arizona from mainstream <br />water. <br />C. The Mexican Treaty of 1944 <br />On February 3, 1944, the United States and Mexico signed <br />a "Treaty ... Relating To Waters of the Colorado) and Tijuana <br />Rivers and Of The Rio Grande," T.S. No. 994, 5 Stat. 1219 <br />(1944). Mexico was thought to have been usi g about 1.8 <br />m.a.f. as of 194417 (ad opposed to about 820,000 acre-feet as <br />of 1922)i8 primarily to irrigate croplands in its fertile <br />Mexicali Valley, which lies in the same basin as the Imperial <br />Valley. Article X of the Treaty guarantee an annual <br />delivery of 1.5 m.a.f. of water to Mexico and a additional <br />-8-