WSP00620

• File Number: 8220.100.40
• Description: CRSP
• Basin: Colorado Mainstem
• Date: 3/14/1963
• Author: USDOI
• Title: Sixth Annual Report on the Statuts of the Colorado River Storage Project
• Water Supply Pro - Doc Type: Annual Report

22

CO~ORADO RIVER STORAGE PROJECT

ElXPLAN,ATION OF SHEET 1 OF 8
Column (2): Actual; flow of Colorado River at Grand Canyon. Flow meas~
ured and data furnish;ed by Geological Survey.
Column (3): ActuaLtotal net Lake Mead loss. This is a water budget com~
putation using the-measured flow at Grand Canyon as inflow 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 and lake below the Grand
Canyon gaging station', evaporation loss from the lake, changes in bank storage,
and diversions from the lake to Nevada.
Columns (4) and (D): Total Hoover release. Water flowing in river below
Hoover Dam is recorded in this column.
Column (6): Downs~ream water requirements. This is the minimum monthly
downstream water requirement defined in section 3 of operating principles. This
requirement will be estimated by months at the beginning of each year, and
adjusted to aotual at the end of each month.
Column (7): Lake Mead end-of-month content. Surface storage at end of
month (changes in.banl-< storage are reflected in column (3)).
Column (8): Lake ,Mead end-of-month elevation. Elevation corresponding
with end-of-month content shown in column (7).
Column (9): Lake Mead, mean elevation. Computed as average of elevations
at end of previous month and end of current month.
Column (10): Lake: iMop.ave, mean monthly elevation. Computed as average
of elevations at end of) previous month and end of current month. This is used
in computation of tailwater elevations for Hoover powerplant. '
Column (11): Hoov~r powerplant-average tailwater elevation. Values to be
taken from Hoover po~erplant tailwater curves, drawing 45-300-59, and will be
based upon Hoover release (col. 5) and Lake Mohave mean monthly elevation
(col. 10), .,
Column (12): Hoov,er powerplant average static head. Computed as column
(9) minus column (11). .
Column (13): Total energy at 83 percent efficiency. Values. are computed by
equation: Kw,-hr.=1.025Xefficiency (83 percent) X static head (eol. 12) Xrele..e
in acre~feet (cot 4). .
Column'(14): Firm energy. Same as column (13), but not to exceed scheduled
firm energy (cot 14, sreet 3). Show annual total only in the .event there is no
deficiency indicated 01 basis of total annual generation.

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