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<br />Projected Plan of Operation. Water Year 1990 <br /> <br />Determination of "602 (a) Storage" <br /> <br />Section 602(a)(3) of the Colorado River Basin Project Act of <br />Septemher 30, 1968 (Public Law 90-537), stipulates that <br />Colorado River water, which is not rcquired to be released <br />under article 1I1(c) and 1I1(d) of the Colorado River <br />Compact, be stored in Upper Basin reservoirs to the extent <br />the Secretary of the Interior (Secretary) fwds such storage <br />necessary to assure compact deliveries without impairment of <br />annual consumptive uses in the Upper Basin. <br /> <br />Article II of the Operating Criteria provides that the annual <br />plan of operation shall include a determination by the <br />Secretary of the quantity of water considered necessary to be <br />in Upper Basin storage as of September 30 of the current year, <br /> <br />This determination shall consider all applicable laws and <br />relevant factors including, but not limited to, the following: <br />(a) historic streamflows; (b) the most critical period of <br />record; (c) probabilities of water supply; (d) estimated future <br />depletions in the Upper Basin, including the effects of <br />recurrence of critical periods of water supply; (e) the "Report <br />of the Committee on Probabilities and Test Studies to the <br />Task Force on Operating Criteria for the Colorado River." <br />dated October 30, 1969, and such additional studies as the <br />Secretary deems necessary; and (I) the necessity to assure that <br />Upper Basin consumptive uses are not impaired because of <br />failure Co store sufficient water CO assure deliveries under <br />Section 602(a)(I) and (2) of Public Law 90-537, <br /> <br />Taking into consideration these relevant factors, the Secretary <br />has determined that the active storage in Upper Basin <br />reservoirs forecast for September 30, 1990, exceeds the <br />"602(a) Storage" requirement under any reasonable range of <br />assumptions which might be applied to those items previously <br />listed, Therefore, the accumulation of "602(a) Storage" is not <br />the criterion governing the release of water during the current <br />year, <br /> <br />Mexican Treaty Obligations <br /> <br />Annual calendar year schedules of monthly deliveries of water <br />in the limitrophe section of the Colorado River"allotted in <br />accordance with the Mexican Water Treaty signed in 1944, are <br />formulated by the Mexican Section and presented to the <br />United States Section, International Boundary and Water <br />Commission (Commission), before the beginning of each <br />calendar year. Upon 30 days advance notice to the <br />United States Section, Mexico has the right to modify, within <br />the total schedule, any monthly quantity prescribed by the <br />schedule by not more than 20 percent. <br /> <br />Based on the current water supply conditions, the <br />United States will make scheduled deliveries of 1,500,000 <br />acre-feet of Colorado River water to the Republic of Mexico <br />in calendar year 1990, Representatives of the Republic of <br />Mexico will be kept informed of operating schedules through <br />the United States Section of the Commission, <br /> <br />3 <br />