Wyo. Stat. § 41-4-329: Excess water; defined.

For the purpose of this act, excess water is hereby defined to be that quantity of water belonging to the state of Wyoming flowing in the natural channel of any main stream or a tributary of a main stream within the boundaries of Wyoming, at any time in excess of the total amount required to furnish to all existing appropriations from the stream system the maximum amount of water to which all appropriations are entitled, whether by permit or by adjudicated decree as of March 1, 1985.