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<br />COLORADO RIVER STORAGE PROJECT
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<br />5, The United States will make a fair allowance for any deficiency,
<br />computed by the method herein set forth, in firm energy generation at
<br />Hoover powerpl~nt. For each operating year deficiency in firm
<br />energy shall be !computed as the difference between firm energy
<br />which, assuming an overall efficiency of 83 percent, would have been
<br />generated and delivered at transmtssion voltage at Hoover power-
<br />plant in that year if water has not been impounded in the reservoirs
<br />of the Colorado River storage project storage units (Glen Canyon,
<br />Flaming Gorge, Navajo, and Curecanti), but excltlding the effects
<br />of evaporation from the surface of such reservoirs, and the energy
<br />actually generated and delivered at transmission voltage at Hoover
<br />powerplant during that year adjusted to refiect an overall efficiency
<br />of 83 percent, At the discretion of the Secretary, allowance will
<br />be accomplished 'by the United States delivering energy, either at
<br />Hoover powerplap.t or at points acceptable to both the Secretary and
<br />the affected Hoover power contractors, or monetarily in an amount
<br />equal to the incremental cost of generating substitute energy, To
<br />the extent the Upper Colorado River Basin fund is utilized the moneys
<br />expended therefrom in accomplishing the allowance, either through
<br />the delivery of. purchased energy or by direct monetary payments,
<br />shall be reimbursed to said fund from the separate fund identified
<br />in section 5 of tlj.e act of December 21, 1928 (45 Stat, 1057), to the
<br />extent such reimbursement is consistent with the expenditures
<br />Congress may ajIthorize from said separate fund pursuant to said
<br />act, The attached additional regulation No. 1 for generation and
<br />sale of power in l}ccordance with the Boulder Oanyon Project Adjust-
<br />ment Act, upon: issuance, will be made a part of these principles
<br />and criteria,
<br />6, In accomplishing the foregoing, Lake Powell will be operated in
<br />general accordance with the provisions of principles 7 and 8.
<br />7, Storage capacity in Lake Powell to elevatIOn 3,490 (6,5 million
<br />acre-feet surface storage) shall be obtained at the earliest practicable
<br />time in accordmilCe with the following procedure: .
<br />Until e1eyation 3,490 is first reached, any water stored in
<br />Lake Powell shall be available to maintain rated head on Hoover
<br />powerplant, i When stored water in Lake Powell has reached
<br />elevatIOn 3,190, it will not be subject to release or diminution
<br />below elevation 3,490, The obtaining of this storage level in
<br />Lake Powell will be in such manner as not to cause Lake Mead
<br />to be drawn down below elevation 1,123 (14.5 million . acre-feet
<br />available surface storage), which corresponds to rated head on
<br />the Hoover, powerplant, In the process of gaining storage to
<br />elevation 3,i'l90, the release from Glen Oanyon Dam shall not
<br />be less than 1.0 million acre-feet per year and 1,000 cubic feet
<br />per second, as long as inflow and storage will permit,
<br />The operationiof Lake Powell above elevation 3,490 and Lake Mead
<br />will be coordinated and integrated so as to produce the greatest prac-
<br />tical amount of power and energy. In view of the provision for al-
<br />lowance set forth in principle 5 hereof, the quantity of water released
<br />through each powerplant will be determined by the Secretary in a
<br />manner appropriate to meet the filling criteria,
<br />9, In general, it is not anticipated that secondary energy will be
<br />generated at Hoover during the filling period. However, any second-
<br />ary energy, as defined in the Hoover contracts, which may be generated
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