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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Understand<strong>in</strong>g the River<strong>in</strong>e <strong>Floodpla<strong>in</strong></strong><br />
Fr<strong>in</strong>ge<br />
<strong>Floodpla<strong>in</strong></strong><br />
Floodway<br />
Stream<br />
Channel<br />
Fr<strong>in</strong>ge<br />
Terms and<br />
Def<strong>in</strong>itions<br />
The <strong>Floodpla<strong>in</strong></strong> is the land that is<br />
subject to a 1%-annual-chance<br />
or greater chance <strong>of</strong> flood<strong>in</strong>g <strong>in</strong><br />
any given year. On FIRMs and<br />
Floodway maps, the <strong>Floodpla<strong>in</strong></strong><br />
may be designated as Zones A,<br />
AO, AH, A1-30, AE, or A99.<br />
See page 5, Understand<strong>in</strong>g the<br />
Floodway, to learn about the<br />
area <strong>of</strong> the floodpla<strong>in</strong> where<br />
floodwaters usually flow faster<br />
and deeper.<br />
For <strong>Floodpla<strong>in</strong></strong>s with Base Flood Elevations, check the Flood Insurance Study to f<strong>in</strong>d the Flood Pr<strong>of</strong>ile which shows<br />
water surface elevations for different frequency floods ( see page 8).<br />
4<br />
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