15.68.040   Base flood elevation.
   This chapter's protection standard is based on the Regulatory Flood Profiles for the Countywide Flood Insurance Study for Cook County. If a base flood elevation (BFE) or one hundred (100) year frequency flood elevation is unavailable for a particular site, then the protection standard shall be according to the best existing available data in the Illinois State Water Survey's Flood Plain Information Repository. When a party disagrees with the best available data, that party may finance the detailed engineering study needed to replace existing data with better data and submit it to IDNR/OWR and FEMA.
   A.   Base Flood for Skokie River SFHA. The base flood or one hundred (100) year frequency flood elevation for the SFHAs of the Skokie River shall be as delineated on the one hundred (100) year flood profiles in the Countywide Flood Insurance Study for Cook County prepared by the Federal Emergency Management Agency and dated August 19, 2008, and such amendments to such study and maps as may be prepared from time to time.
   B.   Base Flood for SFHAs within the Village' s Extraterritorial Jurisdiction. The base flood or one hundred (100) year frequency flood elevation for the SFHAs of those parts of unincorporated Cook County that are within the one and one-half mile extraterritorial jurisdiction or that may be annexed into the Village shall be as delineated on the one hundred (100) year flood profiles in the Countywide Flood Insurance Study for Cook County prepared by the Federal Emergency Management Agency and dated August 19, 2008, and such amendments to such study and maps as may be prepared from time to time.
   C.   Base Flood for AH and AO Zones. The base flood or one hundred (100) year frequency flood elevation for each SFHA delineated as an AH zone or AO zone shall be as described in §601.4.B-C of the WMO.
   D.   Base Flood for A Zones. The base flood or one hundred (100) year frequency flood elevation for each of the remaining SFHAs delineated as an A zone on the Countywide Flood Insurance Rate Map of Cook County shall be according to the best existing data available in the Illinois State Water Survey Flood Plain Information Repository. When no base flood or one hundred (100) year frequency flood elevation exists, the base flood or one hundred (100) year frequency flood elevation shall be determined according to §601.6 of the WMO. Flood flows should be based on anticipated future land use conditions in the watershed as determined from adopted local and regional land use plans. Along any watercourse draining more than one square mile, the above analyses shall be submitted to IDNR/OWR for approval; once approved it must be submitted to the Illinois State Water Survey Floodplain Information Repository for filing. For a nonriverine SFHA, the base flood elevation shall be the historic flood of record plus three (3) feet, unless calculated by a detailed engineering study and approved by the Illinois State Water Survey. (Prior code § 28.04)
(MC-5-2014 §§ 18, 19, 04/17/2014; MC-2-2008, Amended, 05/06/2008)