Alluvial Fan Flooding

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National Flood Insurance Program (NFIP) Policy Index

Definition/Description

Flooding occurring on the surface of an alluvial fan or similar landform which originates at the apex and is characterized by high-velocity flows; active processes of erosion, sediment transport, and deposition; and unpredictable flowpaths. Alluvial fan flooding is depicted on a Flood Insurance Rate Map (FIRM) as Zone AO, with a flood depth and velocity.

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Last Updated: 
07/24/2014 - 16:00
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