Illinois Administrative Code
Title 17 - CONSERVATION
Part 3706 - REGULATION OF CONSTRUCTION WITHIN FLOOD PLAINS
Subpart D - REGULATORY FLOODWAY
Section 3706.410 - Determination of Regulatory Floodway
Universal Citation: 17 IL Admin Code ยง 3706.410
Current through Register Vol. 48, No. 38, September 20, 2024
a) The regulatory floodway shall be determined as that portion of the flood plain required to store and discharge flood waters without causing significant damaging or potentially damaging increases in flood heights and velocities. It is the area subject to higher velocities and inundation with appreciable depths at frequent intervals.
b) The encroachment limits form the landward boundaries of the regulatory floodway. The encroachment limits are based on hydraulic analysis to define the outer portions of the flood plain which do not significantly contribute to conveyance or to valley storage.
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