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<br />17
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<br />-.::J< RIO GRANDE COMPACT COMMISSION REPORT
<br />00
<br />,~, EVAPORATION LOSSES ~.~, f],
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<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 evaporation 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-transplratlon losses which would have
<br />occurred naturally, prior to the construction of such reservoir. Changes In evapo-transplra-
<br />tlon 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 provlslons of Article III 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 slatlon and evaporation slatlon, and, In the event of change In location of any stream
<br />gaging slatlon for any reason, It shall ascertain the Increment In flow or decrease In flow
<br />between such locations for all Slages. Wherever practicable, concurrent records shall be
<br />oblalned for one year before abandonment of Ihe 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, It shall
<br />be the duty of the Commissioner specifically concerned 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 burden Imposed upon Colorado or New Mexico under Ihe schedules of
<br />deliveries eslabllshed 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 slream system outside of the Rio Grande Basin. such
<br />waters shall be measured at the point of delivery into the Rio Grande Basin and proper
<br />allowances shall be made for losses In transll from such points to the Index Gaging Station
<br />on the stream with which the imported waters are comingled.
<br />
<br />~ Amended at Tenth Annual Meeting, February 15, 1949.
<br />
<br />~ Amended at Twelfth Annual Meeting, February 24, 1951.
<br />
<br />{2 Amended June 2, 1959.
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