| Zone X |
Areas determined to be outside the 0.2% annual chance of flood |
| Zone X (500 Year) |
Areas of 0.2% annual chance of flood |
| Zone A |
No Base Flood Elevation determined |
| Zone AE |
Base Flood Elevation determined |
| Zone AE Floodway |
The flood-way is the channel of a stream plus any adjacent floodplain areas that must be kept free of encroachment so that the 1% annual chance flood can be carried without substantial increases in flood heights. |
| Zone AO Depth 1' |
Flood depths of 1 foot (usually sheet flow on sloping terrain) |
| Zone AO Depth 2' |
Flood depths of 2 feet (usually sheet flow on sloping terrain) |