OCR Text |
Show 14 COLORADO RIVER STORAGE PROJECT increase its uses and still meet its compact obligations for flows at Lee Ferry for the benefit of the lower basin and Mexico. The estimated total active storage capacity available in fiscal year 2062 in the four authorized units after sediment encroachment is shown in the following table. This available capacity may be appropriately referred to as replacement storage capacity since it will be used, among other things, to replace to the lower basin an appropriate part of the natural streamflow consumed upstream in the upper basin during prolonged drouth periods. Estimated active storage capacities in fiscal year 2062 [In thousand acre-feet] Unit Fiscal year of Initial active active storage Sediment deposition to end of fiscal year 2062 Remaining active storage-capacity hi initial storage capacity In dead storage capacity In active storage capacity fiscal year 2062 Qlen Canyon____________________ 1963 21,505 5,260 4,180 17,325 Flaming Gorge___________________ 1964 1964 1969 3,600 1,028 720 70 250 10 130 80 20 3,470 948 700 Navaho' _______ Total ................. 26,853 5,590 4,410 22,443 1 The storage capacity at the Navaho unit may be needed ultimately by the potential Navaho irrigation project and other local developments and hence may not be available to meet compact obligations. This situation will be reviewed when the Navaho irrigation project is authorized. RESERVOIR OPERATIONS Two studies were made of the coordinated operation of the four authorized units of the storage project. The first was an initial reservoir filling study to bring the reservoirs to power operating levels and to roughly determine power production potentialities to March 31, 1971. The second was a more detailed study covering coordinated reservoir operations to estimate annual power production after March 31, 1971. The initial filling study was based on average streamflow conditions for the 32-year period 1914-45. The average flow was progressively modified throughout the filling period in accordance with the projected schedule of upstream depletions. Allowances were made for reservoir evaporation and for increases in storage at upstream reservoirs. Each reservoir was first filled to the minimum power operating level in order that power generation might be obtained as early as practicable. Thereafter additional storage was progressively accumulated at all reservoirs from available storable supplies. The filling study indiactes that Glen Canyon, the first reservoir scheduled for completion, would start filling at the beginning of fiscal year 1963. All the reservoirs would fill to reasonable operating levels by March 31, 1971, and the major part of the system power output at the three storage units would then be attained. An annual summary of the initial filling operation for the Glen Canyon Reservoir with allowance for filling of the storage project upstream reservoirs is shown on the following page. The post-filling reservoir operation study was based on several repetitions of a runoff cycle similar to the 32-year runoff period 1914 to 1945. Data corresponding to the 32 years in sequence were inserted in the study for fiscal year 1971 through fiscal year 2002 and the process was repeated for each 32 years thereafter with proper adjustments for increased depletions. Annual releases for system |
Source |
Original book: [State of Arizona, complainant v. State of California, Palo Verde Irrigation District, Coachella Valley County Water District, Metropolitan Water District of Southern California, City of Los Angeles, California, City of San Diego, California, and County of San Diego, California, defendants, United States of America, State of Nevada, State of New Mexico, State of Utah, interveners] : |