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.", ......>..' ,,~.'>-. -,,:.:. .,..-.,','.;..' - -<::l" C.,] Cf') ,.~ c.) commenced when this BUIn equals the total physical capacity of that l~) reservoir, to the level of the uncontrolled spillway i.e.-2,219,000 acre feet in 1942. (c) All water actually spilled at Elephant Butte Reservoir, or released therefrom, in excess of Project requirements, which is cur- rently 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 phy- sical capacity of that reservoir at the level of the sill of the spillway gages, i.e.-l,B30,000 acre feet 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 tributaries below Elephant Butte Reservoir. EVAPORATION LOSSES IJ. The Commission shall encourage the equipping, maintenance arid operation, in cooperation with the United States Weather Bureau or other appropriate agency, of evaporation stations at Elephant Butte Reservoir and at or near each major reservoir in the Rio Grande Basin within Colorado constructed after 1937 and in New Mexico con- structed after 1929. The net loss by evaporation from a reservoir surface shall be taken as the difference between the actual evapora- tion loss and the evapo~transpiration losses which would have occur- red naturally, prior to the construction of such reservoir. Changes in evapo-transpiration losses along stream channels below reservoirs may be disregarded. Net losses by evaporation, as defined above, shall be used in correcting Index Supplies for the operation of reservoirs upstream from Index Gaging Stations as required by the provisions of Article III and Article IV of the Compact. . In the application of the provisions of the last unnumbered paragraph of Article VI of the Compact: (a) Evaporation losses for which accrued credits shall be re- duced shall be taken ss the difference between the gross evaporation from the water surface of Elephant Butte Reservoir and rainfall on the same surface. (b) Evaporation losses for which accrued debits shall be re- duced shall be taken as the net loss by evaporation as defined in the first paragraph. IJ. Amended at Tenth Annual Meeting, February 14, 1949. ',..", '-.':. I I >'~ , "''<;:'. -