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Show APPENDIX VI VI-31 26 COLORADO RIVER STORAGE PROJECT EXPLANATION OF SHEET 3 OF 3 Column (2): Theoretical flow of Colorado River at Grand Canyon. As computed in column (11) on sheet 2. Column (3): Theoretical total net loss from Lake Mead. As computed in column (14) on sheet 2. Columns (4) and (5): Total Hoover release. This is the theoretical release required to produce the predetermined firm energy schedule as shown in column (14) and the theoretical releases for flood control, if required. Column (6): Downstream water requirements. This is the minimum monthly downstream water requirement. (See explanation sheet 1 of 3, col. 6.) Columns (7), (8), and (9): These columns show the theoretical end-of-month content, corresponding elevation, and mean elevation for Lake Mead resulting from the computation of theoretical inflow and release shown in columns (2) through (5). Column (10): Lake Mohave-Mean monthlv elevation. Computed as average of elevations at end of previous month and end of current month, and is the same figure as shown in column (10), sheet 1 of 3. This same level can be used because Lake Mohave scheduled levels are predetermined and are followed as closely as possible by adjustment of Hoover releases in the case of actual operations, and by adjustment of Davis releases in the case of theoretical operation which is on the basis of a Hoover power operation schedule. It is used in the computation of tailwatcr elevations for Hoover powerplant. Column (11): Hoover powerplant, average tailwater elevation. Values are taken from Hoover powerplant tailwater curves, drawing 45-300-59, and are based upon Hoover release, column (5) and Lake Mohave mean monthly elevation, column (10). Column (12): Hoover powerplant, average static head. Column (9) minus column (11). Column (13): Total energy at 83 percent of efficiency. Values are computed by the equation: Kilowatt hours=1.025Xefficiency (83 percent) X static head (col. 12) X release in acre-feet (col. 4). Column (14): Firm energy. Theoretical predetermined schedule of firm energy is entered in this column. (Included as part of total in col. 13). Show annual total only in the event there is no deficiency indicated on basis of total annual generation. Column (15): Computed Hoover firm deficiency. This is computed as the Difference between the theoretical Hoover firm energy and the actual Hoover production adjusted to 83 percent efficiency-firm energy (col. 14, sheet 3) minus firm energy at 83 percent efficiency (col. 14, sheet 1). U.S. Department of the Interior, Bureau op Reclamation, Washington, D.C., January 18, 1960. To: Secretary of the Interior. From: Commissioner, Bureau of Reclamation. Subject: Principles to govern, and operating criteria for, filling Glen Canyon, Flaming Gorge, Navajo, and Curecanti Reservoirs. HISTORICAL During the stages of formulating the planning report for the Colorado River storage project and participating projects (H. Doc. 364, 83d Cong., 2d sess.), it was recognized that special consideration would need to t>e given to wa3Ts and means of accumulating storage in the reservoirs which were contemplated for authorization and construction. That these were matters for special consideration was pointed out to the committees of the Congress during the extensive hearings leading to authorization of the project. References to the filling period may be found on pages 73, 160, 163, and 164 of House Document 364, S3d Congress, 2d session. |