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24 , i CO~ORADO RIVER STORAGE PROJECT EXPLANATION OF .SHEET 2 OF :3 Columns (2), (3), (-;1,), and (5): Actual reservoir storage content, Lake Powell, Flaming Gorge, Cure<ianti units, and Navaho. Values for each of these columns are the actual end of month reservoir surface storage content plus an estimate of initial accumulation of bank storage~ Columns (6), (7), (8), and (9): Reservoir storage change-Lake Powell, Flaming Gorge, Curecanti units and Navaho. Values in these columns are derived from figures in columns (2)j (3), (4), and (5). Column (10): Ac.tual.fl;ow of Colorado River at Grand Canyon. Flow of Colo- rado River measured py, and data reported by Geological Survey. Column (11): Thedretical flow of Colorado River at Grand Canyon. This is computed as the sum) of columns (6) through (10). It is the actual flow of the Colorado River at Grand Canyon increased by reservoir storage changes (algebraic) in the Colorado River: storage project reservoirs. Column (12): Computation of theoretical total net loss from Lake Mead, actual total net loss. This Is a water budget computation using the measured flow at Grand Canyon as infl9w to Lake Mead, the actual release from Hoover Dam and the actual measured :storage change in Lake' Mead. It includes unmeasured inflow to the river anq lake below the Grand Canyon gaging station, evaporation., loss from the lake, chatfges in bank storage, and diversions from the lake to Nevada. Column (13): Computation of theoretical total net loss from Lake Mead- adjustment of evaporE\tion loss. This is an adjustment to be applied to the actual total net loss (eo1. 12)1 and is the difference (theoretical minus aotual) between the theoretical evaporatiop for the theoretioal surface area pf the lake which corre- sponds to the elevatiop: shown in column (9) of sheet 3 and the evaporation com- puted by the Geologicl11 Survey for the actual surface area of the lake. The evap- oration rate applied tp the theoretical surface area of the lake is the same rate Bpplied by the Geological Survey to the actual surface area. Column (14): Computation of theoretical total n€'t loss from Lake Mead- theoretical total net loss. Column (12) plus (algebraic) column (13). ,