WSP05143

• File Number: 8510.100.60
• Description: Rio Grande Compact Commission
• Basin: Rio Grande
• Water Division: 3
• Date: 1/1/1994
• Title: Report of the Rio Grande Compact Commission 1994
• Water Supply Pro - Doc Type: Report/Study

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r- RULES AND REGULATIONS

;;::' RESERVOIR CAPACITIES 11
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(~:.' Colorado shall file with the Commission a. table of areas and capacities for each
reservoir in the Rio Grande Basin above Lobatos constructed after 1937; New Mexico shall
file with the Commission a table of areas and capacities for each reservoir in the Rio Grande
Basin between Lobatos and San Marcial constructed after 1929; and Texas shaWfile with the
Commission tables of areas and capacities for Elephant Butte Reservoir and for all other
reservoirs actually available for the storage of water between Elephant Butte and the first
diversion to lands under the Rio Grande Project

Whenever it shall appear that any table of areas and capacities is in error by more
than five per cent, the Commission shall use its best efforts to have a re-survey made and a
corrected table of areas and capacities to be substituted as SOon as practicable. To the end
that the Elephant Butte effective supply may be computed accurately, the Commission shall
use its best efforts to have the rate of accumulation and the place of deposition of silt in Ele-
phant Butte Reservoir checked at least every three years.

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ACTUAL SPILL 12.

(a) Water released from Elephant Butte in excess of Project requirements, which
is currently passed through Caballo Reservoir, prior to the time of spill, shall be deemed to
have been Usable Water released in anticipation of spill, or Credit Water if such release
shall have been authorized.

(b) Excess releases from Elephant Butte Reservoir, as defined in (a) above, shall
be added to the quantity of water actually in storage in that reservoir, and Actual Spill shall
be deemed to have commenced when this sum equals the total physical capacity of that res-
ervoir, to the level of the uncontrolled spillway, i.e. -2,219,000 acre-ft in 1942.

(c) All water actually spilled at Elephant Butte Reservoir, or released therefrom, in
excess of Project requirements, which is currently passed through Caballo Reservoir, after
the time of spill, shall be considered as Actual Spill, provided that the total quantity of water
then in storage in Elephant Butte Reservoir exceeds the physical capacity of that reservoir
at the level oflhe sill of the spillway gates, i.e. -1,830,000 acre-ft in 1942.

(d) Water releaSed from Caballo Reservoir in excess of Project requirements and
in excess of water currently released from Elephant Butte Reservoir, shall be deemed
Usable Water released, excepting only flood water entering Caballo Reservoir from tributar-
ies below Elephant Butte Reservoir.

DEPARTURES FROM NORMAL RELEASES Q

For the purpose of computing the time of Hypothetical Spill required by Article VI
and for the purpose of the adjustment set forth in Article VII, no allowance shall be made for
the difference between Actual and Hypothetical Evaporation, and any under-release of
usable water from Project Storage in excess of 150,000 acre-ft in any year shall be taken as
equal to that amount.

11 Amended at Eleventh Annual Meeting, February 23, 1950.

12. Adopted at Fourth Annual Meeting, February 24, 1943.

Q. Adopted June 2, 1959; made effective January 1, 1952.

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