The boundaries of said districts shall be shown upon an Official Zoning Map made a part of this chapter and documents and mapping as delineated in Article
XVIII, Floodplain Overlay, and Article
XIX, Steep Slope Overlay. The maps in Articles
XVIII and
XIX showing the limits of the F-P Floodplain Overlay and the S-S Steep Slope Overlay shall be considered overlay maps over the Official Zoning Map. The maps and all notations, references and other data shown thereon are hereby incorporated by reference into this chapter as if they were fully described herein.