Okla. Stat. tit. 82 § 1085.20
It shall be the duty of the Commission to review any proposed project or plan whereby waters of this state are to be collected, stored or retained for any purpose by any dam, reservoir or other structure constructed or caused to be constructed by the United States of America or the State of Oklahoma or any agency, department, subdivision or instrumentality thereof. Whenever it is determined by the Commission after such examination, review and recommendation that there are surplus waters in excess of the present and future needs of water users of the contributing watershed available at the proposed dam and reservoir site for the full and optimum development of any dam, reservoir or other storage site or location requiring inclusion in such plan or project provisions for development of water supplies for domestic, municipal, agricultural, industrial and other purposes, then the Commission shall notify the responsible agency or department of the federal government and the agencies of the State of Oklahoma of its conclusions and request that the design and specifications of such project be constructed to include storage of such water for such uses.
Okla. Stat. tit. 82, § 1085.20