The identified floodplain area shall be any areas of Chambersburg Borough classified as special flood hazard areas (SFHAs) in the Flood Insurance Study (FIS) and the accompanying Flood Insurance Rate Maps (FIRMs) dated January 18, 2012, and issued by the Federal Emergency Management Agency (FEMA) or the most recent revision thereof, including all digital data developed as part of the Flood Insurance Study.
The above referenced FIS and FIRMs, and any subsequent revisions and amendments, are hereby adopted by Chambersburg Borough and declared to be a part of this chapter.
The Floodway District (FW) is delineated for purposes of this chapter using the criteria that a certain area within the floodplain must be capable of carrying the waters of the one-hundred-year flood without increasing the water surface elevation of that flood more than one foot at any point. The areas included in the Floodway District are specifically defined in the Floodway Data Table contained in the above-referenced FIS and shown on the accompanying Flood Hazard Boundary and Floodway Map, as revised. The term shall also include floodway areas which have been identified in other available studies or sources of information for those floodplain areas where no floodway has been identified in the Flood Insurance Study.
The AE Area/District without floodway shall be those areas identified as an AE Zone on the FIRM included in the FIS prepared by FEMA and for which base flood elevations have been provided in the FIS but no floodway has been delineated.
The A Area/District shall be those areas identified as an A Zone on the FIRM included in the FIS prepared by FEMA and for which no one-percent annual chance flood elevations have been provided. For these areas, elevation and floodway information from other federal, state, or other acceptable source shall be used when available. Where other acceptable information is not available, the elevation shall be determined by using the elevation of a point on the boundary of the identified floodplain area which is nearest the construction site. In lieu of the above, the 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 by the municipality.
The delineation of any of the floodplain districts may be revised by the Borough Council where natural or man made changes have occurred and/or more detailed studies conducted or undertaken by the U.S. Army Corps of Engineers or other qualified agency or individual documents the need or possibility for such change. However, prior to any such change, approval must be obtained from the Federal Emergency Management Agency. Additionally, as soon as practicable, but not later than six months after the date such information becomes available, a community shall notify FEMA of the changes by submitting technical or scientific data.
Should a dispute arise concerning the identification of any floodplain area, an initial determination shall be made by the Zoning Officer, and any party aggrieved by such decision may appeal to the Zoning Hearing Board. The burden of proof shall be on the appellant.