Va. Code Ann. § 21-330

A drainage map of the district shall then be completed, showing the location of the ditch or ditches, and other improvements, and the acreage as closely as may be determined by the records, or if necessary, from the notes of the survey, by the drainage engineer, of the lands, designating each tract by a number, owned by each individual landowner or corporation within the district. The location of any railroads or public highways and the boundary of any incorporated town or village within the district shall be shown on the map.