Determination of the Regulatory Flood Elevation. For the purposes of this Ordinance, the regulatory flood elevation, i.e., the one-hundred-year flood elevation plus a freeboard safety factor of 1 1/2 feet shall be used. When available, information from other Federal, State and other acceptable sources shall be used to determine the one-hundred-year flood elevation, as well as a floodway area, if possible. When no other information is available, the one-hundred-year flood elevation shall be determined by using a point on the boundary of the identified floodplain area which is nearest the construction site in question. In helping to make this necessary elevation determination, other sources of data, where available, shall be used such as:
(a) Corps of Engineers — Floodplain Information Reports.
(b) U.S. Geological Survey — Flood Prone Quadrangles.
(c) U.S.D.A., Natural Resource Conservation Service — County Soil Surveys (Alluvial Soils).
(d) Known high-water marks from past floods.
(e) In lieu of the above, the applicable Borough may require the applicant to determine the elevation with hydrologic and hydraulic engineering techniques. Hydrologic and hydraulic analyses shall be undertaken only by professional engineers or others of demonstrated qualifications, who shall certify that the technical methods used correctly reflect currently accepted technical concepts. Studies, analyses, computations, etc., shall be submitted in sufficient detail to allow a thorough technical review.