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<br />RULES AND REGULATIONS
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<br />21
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<br />(b) Excess releases from Elephant Butte Reservoir, as
<br />defined in (a) above, shall be added to the quantity of
<br />water actually in storage in that reservoir, and Actual
<br />Spill shall be deemed to have commenced when this sum
<br />equals the total physical capacity of that reservoir, to
<br />the level of the uncontrolled spillwa~ i.e.-2,219,OOO acre-
<br />ft in 1942,
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<br />(c) All water actually spilled at Elephant Butte
<br />Reservoir, or released therefrom, in excess of Project
<br />requirements, which is currently passed through Caballo
<br />Reservoir, after the time of spill, shall be considered as
<br />Actual Spill, provided that the total quantity of water
<br />then in storage in Elephant Butte Reservoir exceeds the
<br />physical capacity of that reservoir at the level of the sill
<br />of the spillway gates, i.e,-1,830,000 acre-ft in 1942.
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<br />(d) Water released from Caballo Reservoir in excess
<br />of Project requirements and in excess of water currently
<br />released from Elephant Butte Reservoir, shall be deemed
<br />Usable Water released, excepting only flood water entering
<br />Caballo Reservoir from tributaries below Elephant Butte
<br />Reservoir.
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<br />DEPARTURES FROM NORMAL RELEASES Q.
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<br />For the purpose of computing the time of Hypothetical
<br />Spill required by Article VI and for the purpose of the
<br />adjustment set forth in Article VII, no allowance shall
<br />be made for the difference between Actual and Hypothetical
<br />Evaporation, and any under-release of usable water from
<br />Project Storage in excess of 150,000 acre-ft in any year
<br />shall be taken as equal to that amount,
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<br />EVAPORATION LOSSES ii, Lf, ~
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<br />The Commission shall encourage the equipping, main-
<br />tenance and operation, in cooperation with the U.S. Weather
<br />Bureau or other appropriate agency, of evaporation stations
<br />at Elephant Butte Reservoir and at or near each major
<br />reservoir in the Rio Grande Basin within Colorado construc-
<br />ted after 1937 and i~ New Mexico constructed after 1929,
<br />The net loss by evaporation from a reservoir surface shall
<br />be taken as the difference between the actual evaporation
<br />loss and the evapo-transpiration losses whicL would have
<br />occurred naturally, prior to the construction of such
<br />reservoir. Changes in evapo-transpiration losses along
<br />strearr, channels below reservoirs may be disregarded.
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<br />Adopted June 2, 1959; made effective January 1, 1952,
<br />Amended at Tenth Annual Meeting, February 15, 1949,
<br />Amended at Twelfth Annual Meeting, February 24, 1951.
<br />Amended June 2, 1959.
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