Where uncertainty exists about the location of any district boundary shown on the official zoning map, the following rules shall be used to resolve the uncertainty:
A. Where a district boundary approximately follows a property line, such property line shall be construed as the district boundary.
B. Where a district boundary approximately follows a street, alley or railroad line, such street, alley or railroad centerline, or the extension of such line, shall be construed as the district boundary.
C. Where a district boundary approximately follows a watercourse, the centerline of the watercourse shall be construed to be such boundary. In the event of a change in the watercourse shoreline, the boundary shall be construed as moving with the actual shoreline.
D. Where a district boundary does not obviously coincide with any of the above lines (property; street, alley or railroad line; watercourse), or where it is not designated by dimensions, it shall be deemed to be located along the nearest section, quarter section or sixteenth section line. (1984 Code § 11-1-6C)