FEMA flood zone symbology - PentoGIS
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Flood zone symbology by PentoGIS for FEMA National Flood Hazard Layer (NFHL) data (S_FLD_HAZ_AR: fields FLD_ZONE and ZONE_SUBTY). FEMA does not publish one official GIS colour palette; these colours follow FEMA flood map conventions and were checked for colour-blind separation. Free to download and use. Not for official flood determinations: use FEMA's Flood Map Service Center (msc.fema.gov).

Files
- fema-flood-zones.qml            QGIS rule-based style (Layer Properties > Symbology > Style > Load Style)
- fema-flood-zones.lyrx           ArcGIS Pro layer file (Apply Symbology From Layer)
- fema-flood-zones-arcade.txt     The Arcade expression the .lyrx uses, to paste into your own style
- fema-flood-zones.sld            SLD 1.0 for GeoServer and web tools
- fema-flood-zone-colors.csv/json Colour table with recommended 60% fill opacity and outline
- fema-flood-zones-sample.geojson Synthetic demo zones at 0,0 with NFHL field names (not real data)

Works on the NFHL flood hazard areas layer (S_FLD_HAZ_AR) with fields FLD_ZONE and ZONE_SUBTY.
Download NFHL data from FEMA's Flood Map Service Center: https://msc.fema.gov/
Guide: https://pentogis.com/fema-flood-zone-colors
