Revision Techniques Incorporated in the Georgia Map Modernization Program
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The Georgia Map Modernization program employs several techniques to depict updated analysis of Special Flood Hazard Areas (SFHAs) in a revised Flood Insurance Study (FIS) and Digital Flood Insurance Rate Map (DFIRM). The three principal techniques are the limited detail analysis of unstudied streams, redelineation of detailed flooding sources, and the incorporation of studies completed by others. Limited detail analysis is performed for flooding sources which are known to have substantial flooding impacts but are either not currently shown on the effective Flood Insurance Rate Map (FIRM), or for which the flooding effects are inadequately depicted. Redelineation revises the currently effective SFHAs based on updated topographic data. Floodplain mapping data made available by others including special flood hazard studies and Federal Emergency Management Agency Letters of Map Change are identified and, upon review and verification, incorporated into the updated FIS and DFIRM. The paper will discuss the procedures used to incorporate limited detail analyses, redelineated SFHAs, and data submitted by others in the revised FIS and DFIRM. The applications of a GIS environment and the sustainability of the revised information in an adaptable format will be emphasized. The limitations and technical requirements of each approach will be discussed as well.