In his determination of the one-hundred-year flood elevation for the general floodplain area, the Zoning Officer shall use the elevation at a given point in the boundary of the identified general floodplain area which is nearest the site in question. In making this determination, the Zoning Officer shall obtain, review and reasonably utilize the information cited in § 255-6A(c) of this chapter, available U.S. Corps of Engineers Floodplain Information Reports, U.S. Geological Survey Flood-Prone Quadrangles, known high-water marks from past floods, and data submitted with subdivision proposals and other proposed developments. In addition, information from other federal, state, and other acceptable sources shall be used to determine a floodway area if possible.