9-1-6: PREVENTING INCREASED FLOOD HEIGHTS AND RESULTING DAMAGES:

Within any floodway identified on the countywide flood insurance rate map, and within all other floodplains where a floodway has not been delineated, the following standards shall apply:

   A.   Except as provided in subsection B of this section, no development shall be allowed which, acting in combination with existing and anticipated development will cause any increase in flood heights or velocities or threat to public health and safety. The following specific development activities shall be considered as meeting this requirement:

      1.   Bridge and culvert crossings of streams in rural areas meeting the conditions of the Illinois department of natural resources, office of water resources statewide permit number 2;

      2.   Barge fleeting facilities meeting the conditions of IDNR/OWR statewide permit number 3;

      3.   Aerial utility crossings meeting the conditions of IDNR/OWR statewide permit number 4;

      4.   Minor boat docks meeting the conditions of IDNR/OWR statewide permit number 5;

      5.   Minor, nonobstructive activities such as underground utility lines, light poles, signposts, driveways, athletic fields, patios, playground equipment, minor storage buildings not exceeding seventy (70) square feet and raising buildings on the same footprint which does not involve fill and any other activity meeting the conditions of IDNR/OWR statewide permit number 6;

      6.   Outfall structures and drainage ditch outlets meeting the conditions of IDNR/OWR statewide permit number 7;

      7.   Underground pipeline and utility crossings meeting the conditions of IDNR/OWR statewide permit number 8;

      8.   Bank stabilization projects meeting the conditions of IDNR/OWR statewide permit number 9;

      9.   Accessory structures and additions to existing residential buildings meeting the conditions of IDNR/OWR statewide permit number 10;

      10.   Minor maintenance dredging activities meeting the conditions of IDNR/OWR statewide permit number 11;

      11.   Bridge and culvert replacement structures and bridge widening meeting the conditions of IDNR/OWR statewide permit number 12;

      12.   Temporary construction activities meeting the conditions of IDNR/OWR statewide permit number 13;

      13.   Any development determined by IDNR/OWR to be located entirely within a flood fringe area shall be exempt from state floodway permit requirements.

   B.   Other development activities not listed in subsection A of this section may be permitted only if:

      1.   Permit has been issued for the work by IDNR/OWR (or written documentation is provided that an IDNR/OWR permit is not required), or

      2.   Sufficient data has been provided to FEMA when necessary, and approval obtained from FEMA for a revision of the regulatory map and base flood elevation. (Ord. 100410, 10-4-2010)