The governing body may by ordinance make, from time to time, other additions to or modifications of the official map by placing thereon the location of any proposed street, street widening, street vacation, waterway, impounding structures and their dam break inundation zones, or public area in accordance with the procedures applicable to the locality. Prior to making any such additions or modifications to the official map, the governing body shall refer the additions or modifications to the local planning commission for its consideration. The commission shall take action on the proposed additions or modifications within sixty days and report its recommendations to the governing body. Upon receipt of the report of the commission, the governing body shall hold a public hearing on the proposed addition or modification to the official map and shall give notice of the hearing in accordance with § 15.2-2204. All such reports of the commission, when delivered to the governing body, shall be available for public inspection. Any ordinance embodying additions to or modifications of the official map shall be adopted by at least the vote required for original adoption of the official map. After the public hearing and the final passage of such ordinance, the additions or modifications shall become a part of the official map of the locality. All changes, additions or modifications of the official map shall be filed with the clerk of the court as provided in § 15.2-2234.