TITLE 17: CONSERVATION
CHAPTER I: DEPARTMENT OF NATURAL RESOURCES
SUBCHAPTER h: WATER RESOURCES
PART 3706 REGULATION OF CONSTRUCTION WITHIN FLOOD PLAINS
SECTION 3706.440 MODIFICATIONS, ADDITIONS OR REPLACEMENT OF EXISTING STRUCTURES
Section 3706.440 Modifications, Additions or Replacement of Existing Structures
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.
(Source: Amended at 2 Ill. Reg. 47, p. 89, effective November 27, 1978)