boat lifts. (2) Covered lease The term covered lease means a lease for commercial concession purposes under section 4 of the Flood Control Act of 1944 ( 16 U.S.C. 460d ). (3) Covered marina The term covered marina means a marina operating pursuant to a covered lease. (4) Revised Graduated Rental System The term Revised Graduated Rental System means the Revised Graduated Rental System established in Engineer Regulation 405–1–12, or any successor rental system used by the Secretary for purposes of calculating rental amounts for covered leases. (5) Secretary The term Secretary means the Secretary of the Army, acting through the Chief of Engineers.