Illinois Administrative Code
Title 17 - CONSERVATION
Part 3706 - REGULATION OF CONSTRUCTION WITHIN FLOOD PLAINS
Subpart D - REGULATORY FLOODWAY
Section 3706.440 - Modifications, Additions or Replacement of Existing Structures

Universal Citation: 17 IL Admin Code ยง 3706.440

Current through Register Vol. 48, No. 12, March 22, 2024

a) Modifications, additions, or replacement of existing structures which legally comply with all codes and regulations may be permitted so long as the new construction does not increase the flood damageable floor area (excluding basement floor area) of the existing structure by more than twenty (20) percent, and does not obstruct flood flows. Existing structures, as used in this Part, are structures in existence at the time the State Flood Plain Regulations become effective for the watershed in which the structure is located.

b) Floodproofing activities are permitted and encouraged, but must comply with Department and local floodproofing ordinances.

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