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// CODE SNIPPET

1612.3 Establishment of Flood Hazard Areas

Building Code 2021 of Illinois > 16 Structural Design > 1612 Flood Loads > 1612.3 Establishment of Flood Hazard Areas
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To establish flood hazard areas, the applicable governing authority shall adopt a flood hazard map and supporting data. The flood hazard map shall include, at a minimum, areas of special flood hazard as identified by the Federal Emergency Management Agency in an engineering report entitled "The Flood Insurance Study for [INSERT NAME OF JURISDICTION]," dated [INSERT DATE OF ISSUANCE], as amended or revised with the accompanying Flood Insurance Rate Map (FIRM) and Flood Boundary and Floodway Map (FBFM) and related supporting data along with any revisions thereto. The adopted flood hazard map and supporting data are hereby adopted by reference and declared to be part of this section.

1612.3.1 Design Flood Elevations

Where design flood elevations are not included in the flood hazard areas established in Section 1612.3, or where floodways are not designated, the building official is authorized to require the applicant to do one of the following:
  1. Obtain and reasonably utilize any design flood elevation and floodway data available from a federal, state or other source.
  2. Determine the design flood elevation or floodway in accordance with accepted hydrologic and hydraulic engineering practices used to define special flood hazard areas. Determinations shall be undertaken by a registered design professional who shall document that the technical methods used reflect currently accepted engineering practice.

1612.3.2 Determination of Impacts

In riverine flood hazard areas where design flood elevations are specified but floodways have not been designated, the applicant shall provide a floodway analysis that demonstrates that the proposed work will not increase the design flood elevation more than 1 foot (305 mm) at any point within the jurisdiction of the applicable governing authority.

Related Code Sections


1612.3 Structural Design, Establishment of Flood Hazard Areas
To establish flood hazard areas, the applicable governing authority shall adopt a flood hazard map and supporting data. The flood hazard map shall ...
Building Code 2018 of Illinois > 16 Structural Design > 1612 Flood Loads > 1612.3 Establishment of Flood Hazard Areas
1612.3 Structural Design, Establishment of Flood Hazard Areas
To establish flood hazard areas, the applicable governing authority shall adopt a flood hazard map and supporting data. The flood hazard map shall ...
Building Code 2021 of Illinois > 16 Structural Design > 1612 Flood Loads > 1612.3 Establishment of Flood Hazard Areas
502.3 Prescriptive Compliance Method, Flood Hazard Areas
For buildings and structures in flood hazard areas established in Section 1612.3 of the International Building Code, or Section R322 ...
Existing Building Code 2021 of Illinois > 5 Prescriptive Compliance Method > 502 Additions > 502.3 Flood Hazard Areas
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