Assurances of cooperation by counties and municipalities

(a) By vote of the governing body of a municipality or a county commission, any county or municipality authorized to expend money on works of improvement by §19-21A-11 of this code, may alone, or in combination with, the committee or the conservation agency, give assurances, by contract or otherwise, satisfactory to agencies of the United States, congressional committees or other proper federal authority that the county or municipality will construct, improve, operate, or maintain works of improvement or will appropriate a sum or sums of money and expend it for such purposes as provided in §19-21A-11 of this code. (b) The assurances, whether by contract or otherwise, shall be reduced to writing and before final approval of the governing bodies involved shall be submitted to the Attorney General for approval. After approval by the Attorney General and by the governing body or bodies concerned, certified copies of the assurances shall be filed in the office of the county clerk of the county or counties in which the governing bodies are located and in the office of the State Tax Commissioner. (c) Any assurance hereunder may be valid and binding for a period of time not to exceed 50 years.