(A) No development in the SFHA shall create a damaging or potentially damaging increase in flood heights or velocity.
(1) (a) For development proposals located in an identified floodway or within a riverline SFHA where the floodway has not yet been identified, the following rule shall apply: the Building Inspector shall review the development plans to discern if:
1. A new obstruction to flood flows would be created;
2. The project will involve a channel crossing such as a bridge or pipeline; or
3. The project will modify the shape of the channel.
(b) If any of these three situations will result from the project, the applicant shall be required to obtain a permit from the State Department of Transportation, Division of Water Resources, issued pursuant to ILCS Ch. 615, Act 5, § 23. The Building Inspector shall not issue a development permit unless the applicant has obtained either a Section 70 permit or a “waiver of permit required” from the Division of Water Resources.
(2) For development proposals located in a flood fringe, “AO Zone” or “AH Zone”, identified as such on a SFHA map or in a lakefront floodplain, ponding area, area of sheet flow or other SFHA not subject to overbank flooding from an identified channel, the requirement of this division (A) shall not apply.
(B) No development in the SFHA shall include locating or storing chemicals, explosives, buoyant materials, flammable liquids, pollutants or other hazardous or toxic materials below the FPE unless such materials are stored in a storage tank or flood- proofed building constructed according to the requirements of division (C) below.
(C) New replacement sanitary sewer lines and on-site waste disposal systems may be permitted providing all manholes or other above ground openings located below the FPE are water-tight.