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The Operating Criteria provide that the annual plan of operation shall include a determination of the quantity of water considered necessary to be in Upper Basin storage at the end of the water year. Taking into consideration all relevant factors required by the Operating Criteria, it . has been determined that the active storage in Upper Basin reservoirs forecast for September 30, ~ 2000, exceeds the storage required under Section 602(a) of the Colorado River Basin Project _ Q.r1 y Act under any reasonable range of assumptions which might be applied. Therefore, "602(a) MJ(~ . Storage" is not the criterion controlling the release of water from Glen Canyon Dam during f' ~:;:, water year 2000. \ ,~/ 6.(J'jtr ~i ~~ ~ ~~ j\-DV ~ 1t,~ < t>< l~~ ~. r'" ,~V I'S 4 ~ vI'I <.J " '<((J"C ) f- I I I I I I I I I I I I I I I I I I I 2000 DETERMINATIONS The AOP provides guidance regarding reservoir storage and release conditions during the upcoming year, based upon Congressionally mandated storage, release, and delivery criteria and determinations. After meeting these requirements, specific reservoir releases may be modified within these requirements as forecast inflows change in response to climatic variability and to provide additional benefits coincident to the projects' multiple purposes. Upper Basin Reservoirs Section 602(a)(3) of the Colorado River Basin Project Act provides for the storage of Colorado River water in Upper Basin reservoirs that the Secretary of the Interior finds necessary to assure deliveries to comply with Articles ITI( c) and ITI( d) of the 1922 Colorado River Compact, without impairment to the annual consumptive use in the Upper Basin. Pursuant to Section 602(b), as amended, the Secretary is required to make this determination after consultation with the Upper Colorado River Commission and representatives from the three Lower Division States, and after taking into consideration all relevant factors including historic stream flows, the most critical period of record, the probabilities of water supply, and estimated future depletions. Water not required to be so stored will be released from Lake Powell: to the extent it can be reasonably applied in the States of the Lower Division to the uses specified in Article ITI( e) of the 1922 Colorado River Compact, but these releases will not be made when the active storage in Lake Powell is less than the active storage in Lake Mead, to maintain, as nearly as practicable, active storage in Lake Mead equal to the active storage in Lake Powell, and to avoid anticipated spills from Lake Powell. Spill avoidance and/or storage equalization criterion in accordance with Article ll(3) of the Operating Criteria will control the releases from Glen Canyon Dam during water year 2000 unless the minimum objective release criterion in Article ll(2) is controlling. Under the most probable . ~ inflow scenario Glen Canyon Dam will release 14,370 MCM (11.650 MAF). ~ Ji' Y' .jJ ~.., 10 December 1, 1999 16