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FEMA’s
Response to NAVD 88
FEMA mapped and prepared Flood Insurance Studies (FISs) for thousands of communities with flood
elevations
›vertical reference is the datum as defined by NGS
FISs contain flood profiles
Flood Insurance Rate Maps (FIRMs) contain flood elevations and Elevation Reference Marks (ERMs)
Letters of Map Amendment and Revision (LOMAs and LOMRs) are issued based on elevation comparisons
