The boundaries of said districts are indicated upon the Official Zoning Map of the City, and said map and all notations, references, and other information shown thereon, shall be as much a part of this chapter as if the notations, references, and other matters set forth by said map were all fully described herein. In cases where the exact location of a district boundary is not clear as shown on the Official Zoning Map, the following rules shall be used in determining the location of said district boundary:

   1.   Boundaries indicated as approximately following the centerlines of streets, highways, alleys, or other public rights-of-way 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 limit lines.

   4.   Boundaries indicated as following shore or bank lines of a river or body of water, shall be construed to follow such lines, and in the event of change in the shore line shall be construed as moving with the actual shore or bank line; boundaries indicated as following the centerline of streams, rivers, canals, or other bodies of water shall be construed to follow such centerlines.

   5.   Boundaries that are indicated approximately as dividing a parcel or lot of property shall be determined by the use of the scale appearing on the map.

   6.   Boundaries indicated as following railroad lines shall be construed to follow the right-of-way line on that side bordering against the more restrictive use.

   7.   Where physical or cultural features existing on the ground are at variance with those shown on the Official Zoning Map, the Board of Adjustment shall interpret the district boundaries.