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•When an on-channel reservoir is not in priority, the operator is <br />required to release stored water to offset the amount of increased <br />losses due to the increase in free water surface area of the stream <br />to assure that the total natural flow is passed through the reservoir <br />as if the reservoir did not exist. <br />•The gross amount of evaporation can be offset for on-stream <br />reservoirs by any evaporation from previously existing free water <br />surfaces, effective precipitation that would have been consumed by <br />any native vegetation, and/or groundwater consumption due to any <br />native phreatophytes. <br />•When determining the actual evaporation based on the actual <br />surface area of the reservoir, more site-specific information may be <br />required depending upon decree conditions, size of reservoir, <br />impact of reservoir evaporation on other users, and/or availability <br />of data.