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UPDATING THE HOOVER DAM DOCUMENTS that determination; e.g., historic strearnflows, the most critical period of record, probabilities of water supply. Article 11(2) provides that if, in the plan of operation, either: (1) The Upper Basin Storage Reservoirs' active storage forecast for September 30 of the current year is less than the quantity of Section 602(a) Storage determined by the Secretary under Article 11(1) for that date; or (2) The Lake Powell active storage forecast for that date is less than the Lake Mead active storage fore- cast for that date; the objective shall be to maintain a minimum release of water from Lake Powell of 8.23 million acre-feet for that year. However, releases for the years ending September 30, 1971, and 1972, may be greater than 8.23 maf if necessary to deliver 75 maf at Lee Ferry for the 10-year period ending September 30, 1972. Article 11(3) provides that if, in the plan of operation, the Upper Basin Storage Reservoirs' active storage forecast for September 30 of the current water year is greater than the quantity of 602(a) Storage determina- tion for that date, water shall be released annually from Lake Powell at a rate greater than 8.23 maf/yr to the extent necessary to accomplish any or all of the following objectives: (1) To the extent it can be reasonably applied in the Lower Division States to the uses specified in Arti- cle M(e) of the Colorado River Compact, but no such releases shall be made when the active storage at Lake Powell is less than the active storage in Lake Mead; (2) To maintain, as nearly as practicable, active storage in Lake Mead equal to the active storage in Lake Powell; and (3) To avoid anticipated spills from Lake Powell. Article 11(4) provides that in the application of Article 11(3) (b), the annual release will be made to the extent that it can be passed through Glen Canyon Powerplant when operated at its available capability. Any water retained in Lake Powell to avoid bypass of water at the Glen Canyon Powerplant will be released through the powerplant as soon as practicable to equalize the active storage in Lake Powell and Lake Mead. Article 11(5) provides that releases from Lake Powell pursuant to these criteria shall not prejudice the posi- tion of either the Upper or Lower Basin interests with respect to required deliveries at Lee Ferry pursuant to the Colorado River Compact. Article III deals with the operation of Lake Mead and Subarticle M(1) provides for pumping therefrom or releases to meet: (1) Mexican Treaty obligations; (2) Reasonable consumptive use requirements of mainstream users in the Lower Basin; ' (3) Net river losses; (4) Net reservoir losses; and (5) Regulatory wastes. Article 111(2) states that until such time as mainstream is delivered by means of the Central Arizona Project, the consumptive use requirements of Article 111(1)(b) will be met. Article 111(3) provides that after commencement of delivery of mainstream water by means of the Central Arizona Project, the consumptive use requirements of Article 111(1) (b) will be met to the following extent: (1) Normal: to satisfy 7.5 maf of annual consumptive use in accordance with the Decree in Arizona v. California, 376 U.S. 340 (1964). (2) Surplus: the Secretary shall determine when water in quantities greater than "Normal" is available for either pumping or release from Lake Mead pursuant to Article 11(b)(2) of the Decree in Arizona v. California after consideration of all relevant factors, including, but not limited to: (a) The requirements stated in Article 111(1) of these Operating Criteria; (b) Requests for water by holders of water delivery contracts with the United States, and of other rights recognized in the Decree in Arizona v. Califomia; (c) Actual and forecast quantities of active storage in Lake Mead and the Upper Basin Storage Reser- voirs; and (d) Estimated net inflow to Lake Mead. (3) Shortage: the Secretary shall determine when insufficient mainstream water is available to satisfy annual consumptive use requirements of 7.5 maf after consideration of all relevant factors, including, but not limited, to: A-9