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<br />projected hydrologic sequences and <br />operating criteria to provide information <br />on the extent and timing of potential <br />future water shortages. <br /> <br />u.s. Department of the Interior, <br />"Westwide Studyn, 1975, at 175. <br /> <br />Unfortunately, little has been done by the Colorado <br />River Basin states or the federal government to carry out <br />these recommendations. The price of such indifference could <br />turn out to be quite high. <br /> <br />e. Assumptions Made by the Recent Studies <br /> <br />All of the recent studies essentially assume <br />that Lower Basin mainstem supplies will be augmented by 2.0 <br />MAF/yr., or that Lower Basin mainstem diversions, mostly by <br />CAP, will be curtailed under the 1968 Act, or that there is <br />still enough time for basin-wide management and planning. <br />The collapse of these props, however, could have a more <br />significant impact on Upper Basin supplies than even the most <br />extreme resolution of the compact issues discussed above. <br />If these lynchpins do not hold, the Lower Basin will consume <br />all unused Colorado River flows, and leave nothing for Upper <br />Basin energy development. <br /> <br />4. i948 Upper Colorado River Compact <br /> <br />The issues posed by the 1922 Compact and the 1968 <br />Act are only the first set of hurdles in determining the <br />legal availability of water for energy development in the <br />Upper Basin. The resolution of these issues will define the <br />amount of Colorado River water available, or the water supply <br />deficit, which must then be allocated among the Upper Basin <br />states, and from there to individual tributaries within each <br />state. These allocations will be governed by the 1948 Upper <br />Colorado River Compact. <br /> <br />a. Percentage'Apportionment of Consumptive Uses <br /> <br />The 1948 Compact permits each Upper Basin <br />state to consume a percentage of the Upper Basin's entitle-t " <br />ment under the 1922 Compact, except for the northeastern <br />corner of Arizona, which is apportioned a flat 50,000 <br />af/yr. After deducting the Arizona share, the remaining <br />Upper Basin entitlement is divided as follows: <br /> <br />Colorado <br />Utah <br />Wyoming <br />New Mexico <br /> <br />51.75% <br />23.00% <br />14.00% <br />11.25% <br /> <br />-21- <br />