Flood Map Legend and Layers
A flood map legend explains what each color, layer, label, or zone means in that specific map system.
Map Explainers
Map Explainers guides.
Flood Map Update Date Check
Always record the effective date, revision date, or update note before relying on a flood map result.
How to Check Real-Time River Flooding: NOAA Forecasts and USGS Gauges
Use NOAA NWPS for river forecasts and a USGS streamgage for current measurements. Long-term flood maps do not replace active NWS warnings.
Flood Zone AE, VE, and X Meaning
FEMA flood zone labels must be read through FEMA definitions and the current map panel.
FEMA Flood Map vs Risk Rating 2.0: Why Insurance Prices Differ
A FEMA flood zone can affect mandatory-purchase rules, but Risk Rating 2.0 uses more property-specific factors to price an NFIP policy.
Surface Water Flood Risk Check
Surface water flood risk may be shown separately from river or coastal flood layers.
Coastal Flood Map Check
Coastal flood checks may involve separate layers for storm surge, tidal flooding, erosion, and insurance maps.