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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Consistent with the above detenninations and in accordance with other provisions of "The Law <br />of the River," the AOP was developed with "appropriate consideration of the uses of the <br />reservoirs for all purposes, including flood contro~ river regulation, beneficial consumptive uses, <br />power production, water quality control, recreation, enhancement of fish and wildlife, and other <br />environmental factors" (Operating Criteria, Article 1(2)). <br /> <br />Since the hydrologic conditions of the Colorado River Basin can never be completely known in <br />advance, the AOP addresses the operations resulting from three different hydrologic scenarios: <br />the probable maximum, most probable, and probable minimum reservoir inflow conditions. River <br />operations under the plan are modified during the year as runoffpredictions are adjusted to reflect <br />existing snowpack, basin storage, and flow conditions. <br /> <br />Summary <br /> <br />Upper Basin Delivery. Storage equalization and the avoidance of spills will control the annual <br />releases from Glen Canyon Dam in accordance with Article TI(3) of the Operating Criteria unless <br />the minimum objective release criterion in Article TI(2) is controlling. <br /> <br />Lower Basin Delivery. Downstream deliveries and/or flood control parameters are expected to <br />control the releases from Hoover Dam. <br /> <br />Taking into account (1) the existing water storage conditions in the basin, (2) the most probable <br />near-term water supply conditions in the basin, and (3) that the beneficial consumptive use <br />requirements of Colorado River mainstream users in the Lower Division States are expected to <br />be more than 9,250 MCM (7.5 MAF), the surplus condition is the criterion governing the <br />operation of Lake Mead for calendar year 2000 in accordance with Article ill(3)(b) of the <br />Operating Criteria and Article TI(B)(2) of the decree in Arizona v. California. <br /> <br />Any Lower Division State will be allowed to utilize water apportioned to, but unused by, another <br />Lower Division State, in accordance with Article TI(B)( 6) of the decree in Arizona v. California. <br /> <br />1944 Mexican Water Treaty Delivery. A volume of2,097 MCM (1.7 MAF) of water will be <br />allowed to be scheduled for delivery to Mexico during calendar year 2000 in accordance with <br />Article 15 of the 1944 Mexican Water Treaty and Minute No. 242 of the International Boundary <br />and Water Commission. <br /> <br />December 1, 1999 <br /> <br />2 <br /> <br />~ <br />r <br /> <br />,. <br /> <br />~ <br />"V <br /> <br />po <br />'JPb1/ <br />