Where uncertainty exists as to the boundary of any zone, the following rules shall apply:

    A.    Wherever the zone boundary is indicated as being approximately upon the centerline of a street, alley or block or along a property line, then unless otherwise definitely indicated on the map, the centerline of such street, alley or block or such property line shall be construed to be the boundary of such zone.

    B.    Whenever the boundary line of such zone is indicated as being approximately at the line of any river, irrigation canal or other waterway, or public park or other public land, or any section line, then in such case the center of such stream, canal or waterway, or the boundary line of such public land or such section line shall be deemed to be the boundary of such zone.

    C.    Where such boundary line cannot be determined by the rules set out in subsections A and B of this section, their location may be found by the use of the scale appearing upon the map.

    D.    Where application of the preceding rules does not clarify the zone boundary location, the Board of Adjustment shall interpret the map. (PZSC § 03-16-004)