The Contra Costa County Flood Control and Water Conservation District shall give assurances satisfactory to the Secretary of the Army that the local cooperation, required by the Act of Congress approved August 13, 1968 (Public Law 90-483, 82 Stat. 731, 739, Title II, the Flood Control Act of 1968), will be furnished by the district in connection with the project for flood control adopted and authorized in Section 12718.1.