Floodplain Management in Illinois - Illinois Department of Natural ...
Floodplain Management in Illinois - Illinois Department of Natural ...
Floodplain Management in Illinois - Illinois Department of Natural ...
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The Flood Insurance Rate Map<br />
NOTE:<br />
This FIRM does not<br />
show a floodway<br />
(see page 6).<br />
1<br />
2<br />
3<br />
4<br />
5<br />
BASE FLOOD ELEVATION (BFE).<br />
Water surface elevation (<strong>in</strong> feet above datum) <strong>of</strong><br />
the base flood at specific locations (cross-sections).<br />
ELEVATION REFERENCE MARKS (RM).<br />
Po<strong>in</strong>ts for which ground elevation data have been<br />
established and recorded on the FIRM or <strong>in</strong> the<br />
Flood Insurance Study.<br />
FLOOD HAZARD ZONES.<br />
Zone A, Zones A1-A30, and Zone AE are<br />
subject to flood<strong>in</strong>g by the base or 100-year flood<br />
(1% annual chance).<br />
Zone B is subject to flood<strong>in</strong>g by the 500-year<br />
flood (0.2% annual chance).<br />
Zone C is all other areas.<br />
FEMA prepares Flood Insurance Rate Maps to show<br />
areas that are predicted to flood after <strong>in</strong>tense or<br />
major storms. The FIRMs estimate how high the water<br />
may rise, called the Base Flood Elevation.<br />
7<br />
ILLINOIS QUICK GUIDE
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