A. Rules: Where uncertainty exists as to the boundaries of districts as shown on the official zoning map, the following rules shall apply:
1. Boundaries indicated as approximately following the centerline of streets, highways, or alleys shall be construed to follow such centerlines.
2. Boundaries indicated as approximately following platted lot lines shall be construed as following such lot lines.
3. Boundaries indicated as approximately following city limits shall be construed as following such city limits.
4. Boundaries indicated as following railroad lines shall be construed to be midway between the main tracks.
5. Boundaries indicated as following shorelines of bodies of water shall be construed to follow shorelines, and in the event of change in the shoreline shall be construed as moving with the actual shoreline.
7. Except as provided in subsection A9 of this section, where physical or cultural features existing on the ground are at variance with those shown on the official zoning map, or in other circumstances not covered by subsections A1 through A6 of this section, the zoning board of appeals shall interpret the district boundaries.
8. Except where flood fringe boundary lines are involved, or where floodway district boundary lines are involved, where a district boundary line divides a lot which was in single ownership on the effective date hereof, the zoning board of appeals may permit the extension of the regulations for either portion of the lot not to exceed one hundred feet (100') beyond the district line into the remaining portion of the lot.
9. Where a flood fringe district boundary line or where a floodway district boundary line divides a property, the provisions of the respective district(s) (sections 15.2.6 and 15.2.7 of this chapter) shall apply only to that portion or portions of the property in the respective flood fringe or floodway districts.
10. Flood fringe and floodway district boundary lines on the official zoning map are necessarily generalized because of the official zoning map scale and limited topographical information available. Exact boundary lines shall be determined as provided in sections 15.2.6 and 15.2.7 of this chapter. When the floodway district boundaries shown on the flood insurance rate map (FIRM) along with the flood insurance study, Carbondale, Illinois, dated May 2, 2008; and adopted by section 15.2.7.1 of this chapter; the FIRM boundaries shall prevail. Whenever a floodway district boundary conflict is discovered, the planning services division shall correct the official zoning maps to correspond with the floodway boundary shown on the FIRM map. (Ord. 2013-20)