The purpose of this article is to constitute policies that involve and affect all or a majority of the zoning districts in the Borough of Derry Zoning Ordinance. This article provides for the designation of the zoning districts, the establishment of the Zoning Map and the district boundaries interpretation procedure as well as annexation.

For the purpose of this chapter, the Borough is hereby divided into six zoning districts and a floodplain area, which shall be designated as follows:

The boundaries of the Zoning Districts shall be shown upon the Map attached to and made part of this chapter, which shall be designated "Borough of Derry Zoning Map." Said Map and the entire notation, references, and other data shown thereon are hereby incorporated by reference into this chapter as if all were fully described herein.

Zone boundary lines are intended to follow street, alley, or public rights-of-way, center lines, railroad rights-of-way, streams, and lot or property lines as they exist on plats of record at the time of the passage of this chapter. Whenever any street, alley, or other public right-of-way is vacated, the one adjoining each side of such street, alley, or public right-of-way shall be automatically extended to the center of such vacation.

When a district boundary line divides a lot, held in single and separate ownership at the effective date of this chapter, the regulations of the district which contains the majority of the lot will apply.

Where land area has become a part of the Borough by annexation, the same shall automatically be classed as being in the R-SH Single-Household Residential Zone until such classification shall have been changed by an amendment to the ordinance as provided herein. The process for such amendment shall begin within 60 days of the annexation.

Where a parcel of land in any of the six zoning districts has been identified as being situate in a floodplain area as defined by the Federal Emergency Management Agency (FEMA) and indicated on the Flood Boundary and Floodway Maps, then the floodplain regulations of the Borough of Derry shall also govern[1] as regards to building and uses for any said parcel. However, the provisions and requirements of this Zoning Ordinance shall remain in full force and effect to the extent that they are more restrictive than the floodplain regulations.