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<br />7 <br /> <br />CJ <br />C.) <br />rv in a body of legislation controlling the use of water and the operation <br />C',,:l <br />~ of related facilities throughout the basin. A brief summary of the <br />l\j <br />legislation and court rulings relevant to this study follows. [For a <br /> <br />more complete discussion of the legal and political history of the <br /> <br />Colorado River see N.A.S. (1968);and Mann et al. (1974)]. <br /> <br />The Colorado River Compact of 1922 <br /> <br />The agreement eventually reached between the Upper and Lower <br /> <br />Basins, referred to as the Compact of 1922, legally defines the Upper <br /> <br />and Lower Basins and assigns rights to Colorado River water to each <br /> <br />basin (N.A.S., 1968). On the basis of hydrologic records available <br /> <br />at the time, the mean flow of the river as measured at the boundary of <br /> <br />the two basins, Lee Ferry, Arizona, was taken to be 15 MAF/yr <br /> <br />3 <br />(18 km /yr).* The Compact divides this quantity equally between the <br /> <br />Upper and Lower Basins, providing rights for the use of 7.5 MAF/yr <br /> <br /> <br />(9.2 km3/yr) to each basin. Three additional articles state that <br /> <br />(1) the Upper Basin shall not allow the flow into the Lower Basin <br /> <br />to fall below an aggregate of 75 MAF for any period of ten consecutive <br /> <br />years; (2) that the Lower Basin might increase its beneficial consump- <br /> <br />tive use by 1 MAF/yr; and (3) that any quantity of water subsequently <br /> <br />promised to Mexico must be contributed by both the Upper and Lower <br /> <br />Basins equally. <br /> <br />* <br />The Upper and Lower Basins are divided at Lee Ferry, Arizona, <br />one mile below the junction of the Paria and Colorado Rivers. The <br />flow of the Colorado River is gauged at Lees Ferry, Arizona, 0.8 miles <br />above the Paria River and 16 miles below Glen Canyon Dam, as shown in <br />Figure 1. 2 . <br /> <br />