TITLE 17: CONSERVATION
CHAPTER I: DEPARTMENT OF NATURAL RESOURCES
SUBCHAPTER h: WATER RESOURCES
PART 3706 REGULATION OF CONSTRUCTION WITHIN FLOOD PLAINS
SECTION 3706.540 FLOODPROOFING ACTIVITIES
Section 3706.540 Floodproofing Activities
a) Modification, additions, or replacement of existing structures shall be permitted which do not increase the flood damageable floor area (excluding basement floor area) of the existing structure by more than twenty (20) percent. 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 local floodproofing ordinances. Existing structures may be protected by levees or floodwalls.
(Source: Amended at 2 Ill. Reg. 47, p. 89, effective November 23, 1978)