Modeling and Mapping Non-Accredited Levees: Natural Valley Procedure

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The Federal Emergency Management Agency (FEMA) has developed a new set of procedures for analyzing and mapping flood hazards on the landside of non-accredited levee systems on Flood Insurance Rate Maps (FIRMs). FEMA’s new procedures allow a levee system to be segmented into multiple reaches for analysis and mapping purposes.

This fact sheet summarizes the Natural Valley procedure.

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