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 Countywide Flood Insurance Rate Map<br />
Newer FIRMs comb<strong>in</strong>e counties and<br />
<strong>in</strong>corporated municipalities, so match<strong>in</strong>g<br />
across boundaries isn’t a problem.<br />
The Floodway is the ”cross-hatched”<br />
area<br />
ZONE AE is the 100-year<br />
(1%-annual-chance) floodpla<strong>in</strong><br />
ZONE X (shaded) shows areas<br />
affected by the 500-year flood<br />
(formerly B Zone)<br />
1<br />
2<br />
3<br />
ZONE X (unshaded) is all other areas<br />
(formerly C Zone)<br />
4<br />
The Floodway is the area where most conveyance and velocity flows occur.<br />
In Ill<strong>in</strong>ois, very specific laws govern the use <strong>of</strong> Floodways (see page 5).<br />
6<br />
ILLINOIS QUICK GUIDE
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