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<br />31
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<br />
<br />RULES AND REGULATIONS
<br />
<br />RESERVOIR CAPACITIES L1
<br />
<br />Colorado shall file with the Commission a table of areas and capacities for each res-
<br />ervoir in the Rio Grande Basin above Lobatos constructed after 1937; New Mexico shall file
<br />with the Commission a table of areas and capacities for each reservoir in the Rio Grande
<br />Basin between Lobatos and San Marcial constructed after 1929; and Texas shall file with the
<br />Commission tables of areas and capacities for Elephant Butte Reservoir and for all other res-
<br />ervoirs actually available for the storage of water between Elephant Butte and th~ first diver-
<br />sion to lands under the Rio Grande Project.
<br />
<br />Whenever it shall appear that any table of areas and capacities is in error by more
<br />than five per cent, the Commission shall use its best efforts to have a re-survey made and a
<br />corrected table of areas and capacities to be substituted as soon as practicable. To the end
<br />that the Elephant Butte effective supply may be computed accurately, the Commission shall,
<br />use its best efforts to have the rate of accumulation and the place of deposition of silt in Ele-
<br />phant Butte Reservoir checked at least every three years.
<br />
<br />ACTUAL SPILL /2., ~
<br />
<br />(a) Water released from Elephant Butte in excess of Project requirements, which is
<br />currently passed through Caballo Reservoir, prior to the time of spill, shall be deemed to have
<br />been Usable Water released in anticipation of spill, or Credit Water if such release shall have
<br />been authorized.
<br />
<br />(b) Excess releases from Elephant Butte Reservoir, as defined in (a) above, shall
<br />be added to the quantity of water in storage in that reservoir, and Actual Spill 'shall be deemed
<br />to have commenced when this sum equals the total capacity of that reservoir to the level of
<br />the uncontrolled spillway less capacity reserved for flood control purposes, Le" 2,040,000
<br />acre-feet in the months of October through March, inclusive, and 2,015,000 acre-feet in the
<br />months of April through September, inclusive, as determined from the 1988 area-capacity
<br />table or successor area-capacity tables and flood control storage reservation of 50,000 acre-
<br />feet from April through September and 25,000 acre-feet from October through March.
<br />
<br />(c) All water actually spilled at Elephant Butte Reservoir, or released therefrom, in
<br />excess of Project requirements, which is currently passed through Caballo Reservoir, after the
<br />time of spill, shall be considered as Actual Spill, provided that the total quantity of water then
<br />in storage in Elephant Butte Reservoir exceeds the physical capacity of that reservoir at the
<br />level of the sill of the spillway gates, I.e. -1,830,000 acre-ft in 1942.
<br />
<br />(d) Water released from Caballo Reservoir in excess of Project requirements and in
<br />excess of water currently released from Elephant Butte Reservoir, shall be deemed Usable
<br />Water released, excepting only flood water entering Caballo Reservoir from tributaries below
<br />Elephant Butte Reservoir.
<br />
<br />DEPARTURES FROM NORMAL RELEASES l!i
<br />
<br />For the purpose of computing the time of Hypothetical Spill required by Article VI
<br />and for the purpose of the adjustment set forth in Article VII, no allowance shall be made for
<br />the difference between Actual and Hypothetical Evaporation, and any under-release of usable
<br />water from Project Storage in excess of 150,000 acre-ft in any year shall be taken as equal to
<br />that amount.
<br />
<br />L1 Amended at Eleventh Annual Meeting, February 23,1950.
<br />
<br />/2 Adopted at Fourth Annual Meeting, February 24,1943.
<br />
<br />t3. Amended September 9, 1998.
<br />
<br />l!i Adopted June 2, 1959; made effective January 1, 1952.
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