OCR Text |
Show VI-40 UPDATING THE HOOVER DAM DOCUMENTS COLORADO RIVER STORAGE PROJECT 35 6. In accomplishing the foregoing, Glen Canyon Reservoir will be operated in general accordance with the provisions of Sections 7 and 8. 7. Storage capacity in Glen Canyon Reservoir to elevation 3,490 (6.5 million acre-feet surface storage) shall be obtained at the earliest practicable time in accordance with the following procedure: Until elevation 3,490 is first reached, any water stored in Glen Canyon Reservoir shall be available to maintain rated head on Hoover powerplant. When stored water in Glen Canyon Reservoir nas reached elevation 3,490, it will not be subject to release or diminution below elevation 3,490. The obtaining of this storage level in Glen Canyon Reservoir will be in such manner as to not cause Lake ]Vfead to be drawn down below elevation 1,123 (14.5 million acre-feet available surface storage), which corresponds to rated head on the Hoover powerplant. In the process of gaining storage to elevation 3,490, the release from Glen Canyon shall not be less than 1.0 million acre-feet per year and 1,000 cubic feet per second, as long as inflow and storage will permit. 8. The operation of Glen Canyon Reservoir above elevation 3,490 and Lake Mead will be coordinated and integrated so as to produce the greatest practical amount of power and energy. In view of the provision for allowance set forth in section 5 hereof, the quantity of water released through each powerplant will be determined by the Secretarv in a manner appropriate to meet the filling criteria. Operation will be generally' as follows: The combined generation at Glen Canyon and Hoover will be at a preestablished annual rate, generally uniform from year to year following an energy build-up period. The obtaining of water in Glen Canyon Reservoir between elevation 3,490 and elevation 3.700 will be accomplished by storing the annual amount by which inflow exceeds release for energy generation at Glen Canyon. To produce the greatest practical amount of power and energy it may be necessary to draw Lake Mead to elevation 1,050. It woud not be practical, however, to draw Lake Mead below elevation 1,050. 9. Because of the coordinated operation, except for energy that would be generated by water which otherwise would be spiiled at Hoover Dam, no secondary energy will be generated at Hoover. 10. Whenever Glen Canyon storage has reached elevation 3,700 or May 31, 1987, has occurred, these principles and criteria will no longer be applicable, or if in the judgment of the Secretary the contents of both reservoirs are such as to warrant such action, he may declare these principles and criteria no longer applicable. 11. In the annual application of the flood control regulations to the operation of Lake Mead, recognition shall be given to available capacity in upstream reservoirs. |