In determining with precision what territory is actually included within any zoning district, the Zoning Administrator shall apply the following rules.
(A) Where a district boundary, as indicated on the zoning map, approximately follows any of the features listed below on the left, the corresponding feature on the right shall be deemed the district boundary:
(1) Centerline of any street, alley or highway of such centerline;
(2) Lot line such lot line;
(3) Railroad tracks right-of-way line of such tracks;
(4) Stream center of such stream; and
(5) Section lines, quarter section lines, quarter-quarter section lines, survey lines such lines.
(B) Whenever any street, alley or other public way is legally vacated, the zoning districts adjoining each side of such vacated public way shall automatically extend to the center of such way, and all territory included in the vacated way shall thereafter be subject to all regulations of the extended districts.
(C) The regulatory flood elevation at any point in question shall determine where the floodplain overlay district boundary is located on the land.
(1960 Code, § 60-3-4)