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<br />RIO GRANDE COMPACT COMMISSION REPORT
<br />
<br />EVAPORATION LOSSES L5., $., a
<br />
<br />The Commission shall encourage the equipping, maintenance and operation, in
<br />cOOperation with the U.S. Weather Bureau or other appropriate agency, of evaporatiori sta-
<br />tions at Elephant Butte Reservoir and at or near each major reservoir in the Rio Grande
<br />Basin within Colorado constructed after 1937 and in New Mexico constructed after 1929.
<br />The net loss by evaporation from a reservoir surface shall be taken as the difference
<br />between the actual evaporation loss and the evapo-transpiration losses which would have
<br />OCcurred naturally, prior to the Construction of such reservoir. Changes in evapo-transpira_
<br />tion losses along stream channels below reservoirs may be disregarded.
<br />
<br />Net losses by evaporation, as defined above, shall be used in correcting Index
<br />Supplies for the operation of reservoirs upstream from Index Gaging Stations as required by
<br />the provisions of Article 1/1 and Article IV of the Compact.
<br />
<br />In the application of the provisions of the last unnumbered paragraph of Article VI
<br />of the Compact:
<br />
<br />(a) Evaporation losses for which accrued credits shall be reduced shall be taken
<br />as the difference between the gross evaporation from the water surface of Elephant Butte
<br />Reservoir and rainfall on the same surface.
<br />
<br />(b) Evaporation losses for which accrued debits shall be reduced shall be taken
<br />as the net loss by evaporation as defined in the first paragraph.
<br />
<br />ADJUSTMENT OF RECORDS
<br />
<br />The Commission shall keep a record of the location, and description of each gag-
<br />ing station and evaporation station, and, in the event of change in location of any stream
<br />gaging station for any reason, it shall aScertain the increment in flow or decrease in flow
<br />between such locations for all stages. Wherever practicable, concurrerit records shall be
<br />obtained for one year before abandonment of the previous station. ' .
<br />
<br />NEW OR INCREASED DEPLETIONS
<br />
<br />In the event any Works are constructed which alter or may be expected to alter the
<br />flow at any of the Index Gaging Stations mentioned in the Compact, or which may otherwise
<br />necessitate adjustments in the application of the schedules set forth in the Compact, itshall
<br />be the duty of the Commissioner specificallYoConcerned to file with the Commission all avail-
<br />able information pertaining thereto, and appropriate adjustments shall be. made in accor-
<br />dance with the terms of the Compact; provided, however, that any such adjustments shall in
<br />no way increase the blJrdenimposed upon Colorado or New Mexicounaer the schedules of
<br />deliveries established by the Compact. ....
<br />
<br />TRANSMOUNTAIN DIVERSIONS
<br />
<br />In the event any. works are constructed for the delivery of waters into the drainage
<br />basin of the Rio Grande from any stream system outside of the Rio Grande Basin, such
<br />waters shall be measured at the point of delivery into the Rio Graryde Basin and proper
<br />allowances shall be made for losses in transit from such points to the Index Gaging Station
<br />on the stream with which the impOrted' waters are commingled.
<br />
<br />m. Amended at Tenth Annual Meeting, February 15, 1949.
<br />
<br />$. Amended at Twelfth Annual Meeting, February 24, 1951.
<br />
<br />a Amended June 2, 1959.
<br />
<br />32
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