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<br />COtORADO RIVER STORAGE PROJECT
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<br />EXPLANATION QF SHEET 3 0.1' 3
<br />Column (2): Theor~tical :flow of Colorado. River at Grand Canyon. As com.
<br />puted in column (II) on sheet 2.
<br />Column, (3): Theoretical total net loss from Lake Mead. As computed in
<br />column (1<;1) Qn sheet ~.
<br />Columns (4) and (5): Total Hoover release. This is the theoretical release
<br />required to. produce tile predetermined firm energy schedule as shown in column
<br />(14) and the theoretic~l releases far flood control, if required.
<br />Column, (6): Downstream water requirements. This is the minimum monthly
<br />downstream water re~uirement. (See explanation sheet 1 of 3, 00.1. 6.)
<br />Columns (7), (8), aud (9): These columns show the theoretical end-of-month
<br />content, corresponding elevation, and mean elevation for Lake Mead resultin~
<br />from the computatioI). of _ theoretical inflow and release shown in columns (2)
<br />through (5).'
<br />Column (10): Lake!Mohave---:'Mean monthly elevation. Computed as average
<br />of elevations at end ofiprevious month and end of current month, and is the same
<br />figure as shown in column (10), sheet 1 of 3. This same level can be used because
<br />Lake Mohave scheduled levels are predetermined and are followed as closely as
<br />possible by adjustment of Hoover ,releases in the case of actual operations, and
<br />by adjustment of Davis releases in the case of theoretical operation which is on
<br />the basis of a Hoover :power operation schedule. It is used in the computation of
<br />tailwater elevations for Hoover powerplant.
<br />Column (11): Hoovp+ powerplant, average tailwater elevation'. Values are
<br />taken from Hoover p'owerplant tailwat,er curves, drawing 45-300-59, and are
<br />based upon Hoover release, column (5) and Lake Mohave mean monthly
<br />elevation, column (10):.
<br />Column (12): Hoover powerplant, average statio head. Column (9) minus
<br />colnmn (II).' ,
<br />Column (13): Total energy at 83 percent of efficiency. Values are computed
<br />by the equation: KilQwatt hours=1.025Xefficienoy (83 percent) X static head
<br />(col. 12) X release in i\cre-feet (col. 4).
<br />Column (14): Firm: energy. Theoretical predetermined schedule of firm
<br />energy is entered in this column. (Included as part of total in col. 13). Show
<br />annual total o~ly in the event there is no deficiency indicated on basis of total
<br />annual generation. i
<br />Column (15):- Com8uted Hoover firm deficiency, This is computed as the
<br />Difference _ between th;e: theoretical Hoover firm energy and the actual Hoover
<br />production adjua,ted to 83 perpent effi~iency~firm energy (001. 14,-, sheet 3)
<br />minus firm energy at 83 peroent efficiency (col. 14, sheet 1).
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<br />D,S. DEPARTMENT OF THE INTERIOR,
<br />BUREAU OF RECLAMATION,
<br />Washington, D,O" January 18, 1960.
<br />
<br />To: Secretary of t4e Interior.
<br />From: Oommission:er, Bureau of Reclamation, .
<br />Subject: Princip!esi to govern, a~d operating crit~ria for, fi)ling Glen
<br />Oanyon, Flamm!! Gorge, NavaJO, and Ourecantl ReservOlrs,
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<br />HISTORICAL
<br />
<br />During the stage~ of formulating the planning report for the 0010-
<br />rado River storage: project and participating {lrojects (H, Doc, 364,
<br />S3d Oong., 2d sess.), it was recognized that speClal consideration would
<br />need to be given to ways and means of accumulating storage in the
<br />reservoirs which w~re contemplated for authorization and construc-
<br />tion, That these were matters for special consideration was pointed
<br />out to thecommit~ees of the Oongress during the extensive hearings
<br />leading to authori?ation of the project. References to the filling
<br />period may be fOUljd on pages 73, 160,163, and 164 of House Docu-
<br />ment 364, S3d Oongress, 2d session.
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