(A) In SFHA or floodplains, where no floodway have been identified and no base flood or 100-year frequency flood elevations have been established by FEMA, and draining more than a square mile, development must meet the requirements of the IDNR-OWR, and no development shall be permitted unless the cumulative effect of the proposals, when combined with all other existing and anticipated uses and structures, shall not significantly impede or increase the flow and passage of the floodwaters nor significantly increase the base flood or 100-year frequency flood elevation.
(B) The applicant shall obtain approval from the IDNR-OWR for all development any portion of which is located partially or completely within the regulatory floodplain (without a delineated regulatory floodway) with a tributary drainage area of one square mile or more.
(C) The development shall not singularly or cumulatively result in an obstruction of flood flows or potential flood damages outside the site due to an increase in flood heights, velocities, or loss of floodplain area storage.
(D) No new structures or buildings with basements are permitted within the SFHA as determined by elevation from an FIS or detailed flood study. All buildable residential and nonresidential lots must be outside the SFHA for new development to minimize flood risk associated with base flood and higher-magnitude floods. Subdivisions and planned unit developments are required to obtain a Letter of Map Revision from FEMA in accordance with § 152.091.
(Ord. 3187, passed 1-22-19) Penalty, see § 152.999