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. . . 1558 exchange; (b) Prior to any exchange, the seecific source of imported or native w'ater, as limited by the Operating Principles for Trinidad Dam and Reservoir Project, as amended, will be verified by the Colorado State Engineer; (c) For each acre-foot of native water stored in Trinidad Reservoir by exchange, the Colorado Division of Parks will deliver an acre-foot of identifiable imported water, or native water whose consumptive use has been determined by final decree of the Colorado Water Court, to the Arkansas River at the Las Animas gaging station; (d) Transit losses between the source of supply for .an exchange and the Las Animas gage will be determined and assessed by the Colorado State Engineer, using the "Livingston Mmethod" or other suitable means, to assure that a "one for one" exchange is accomplished. The Colorado State Engineer will report contemporaneously and annually to the Arkansas Administration on the initial filling and evaporation and seepage in the permanent fishery and account Ri ver Compact replacement of pool. 2. In the accounting for water in storage, evaporation and seepage losses due to the permanent fisherv pool shall be determined using the most recent data available by the Colorado State Enaineer and the District with the cooperation of the operatina aaencv. 3. There shall never be any release or transfer of water from the oermanent fisherv pool excepting by necessity of dam safety or flood emergency operations as determined by the Corps of Engineers, District Engineer. Article VI - REVIEW AND AMENDMENT These Operating Principles may be subject to review and amendment not more than once a year at the request of any of the parties' signatory; provided, that at least one review shall be accomplished within the first 10 years following completion of the Trinidad Dam and at least one review be accomplished every 10 years thereafter. The primary object of such reviews will be obtaining optimum beneficial use of water as conditions change, operating experience is gained, and more technical data become available. 12