(A) No proposed development in the SFHA shall increase the base flood elevation unless:
(1) It is determined by the city’s Building Inspector that the total cumulative effect on the proposed development, when combined with all other existing and anticipated development, will not increase the base flood elevation more than one foot for the affected hydraulic reach of the stream and will not increase flood damages or potential flood damages;
(2) A permit has been issued by the state’s Department of Transportation, Division of Water Resources, pursuant to 615 ILCS 5/23, or a waiver of the permit has been obtained; and
(3) For all projects involving channel modifications or fill (including levees), the city shall submit sufficient data to the Federal Emergency Management Agency to revise the regulatory flood maps and profiles.
(B) For development proposals located in flood fringe, AO Zone or AH Zone, identified as such on an 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 division (A) above shall not apply.
(C) 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 the materials are stored in a storage tank or flood-proofed building constructed according to the requirements of § 152.37(B)(3) of this chapter.
(D) New and 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.
(1994 Code, § 152.26) (Ord. 323, passed 3-28-1983)