(1) Where such boundaries are indicated as approximately following the centerline of streets or alleys or lot lines, such lines shall be construed to be such boundaries.

(2) Where one or more zone boundary intersects a parcel, the location of such boundary shall be determined by use of the scale appearing on said zoning map and the respective portions of the parcel shall be subject to the respective zones except as provided below.

(3) Where a public street is officially vacated or abandoned, the area comprising such vacated street or alley shall acquire the classification of the property to which it reverts.

(4) Where a zone boundary intersects a lot or lots which are a part of a subdivision approved pursuant to County subdivision regulations, the entire lot shall be subject to the requirements of the zone which is the most compatible with the purpose and function of the subdivision; provided, that this provision shall not diminish the effectiveness of applicable plat restrictions.

(5) Where a watercourse is designated as the boundary between two (2) zones, the centerline of said watercourse shall be the precise boundary.