The township board of any township, the legislative body of any incorporated city or incorporated village, or the board of county road commissioners of any county when directed by the county board of commissioners of the county, pursuant to a resolution adopted by a 2/3 vote of its members, is authorized to grant to the United States assurances as are required by federal flood control acts, by amendments to those acts, and by such other federal acts existing, or which may be enacted in the future, authorizing expenditure of federal funds for flood control, drainage, or beach erosion control projects.