(A) This chapter’s protection standard is based on the flood insurance study for the village.
(B) If a base flood elevation or 100-year frequency flood elevation is not available for a particular site, then the protection standard shall be according to the best existing data available in the State Water Survey’s Flood Plain Information Repository.
(C) When a party disagrees with the best available data, he or she may finance the detailed engineering study needed to replace existing data with better data and submit it to DWR and FEMA.
(1) The base flood or 100-year frequency flood elevation for the SFHAs of Fox River shall be delineated on the 100-year flood profiles in the Countywide Flood Insurance Study for Kane County prepared by FEMA and dated November 16, 2006 and such amendments to such study and maps as may be prepared from time to time.
(2) The base flood or 100-year frequency flood elevation for the SFHAs of those parts of unincorporated Kane and Cook Counties that are within the extraterritorial jurisdiction of the village that may be annexed into the village shall be delineated on the 100-year flood profiles in the Countywide Flood Insurance Study for Kane and Cook Counties prepared by FEMA for Kane County dated December 20, 2002 and November 16, 2006, and Cook County dated December 20, 2002 and November 16, 2006 and such amendments to such study and maps as may be prepared from time to time.
(3) The base flood or 100-year frequency flood elevation f or each SFHA delineated as an “AH Zone” or “AO Zone” shall be that elevation or depth delineated on the flood insurance rate map of the village.
(4) The base flood or 100-year frequency flood elevation for each of the remaining SFHAs delineated as an “A Zone” on the flood insurance rate map of the village shall be according to the best existing data available to the Illinois State Water Survey Flood Plain Information Repository. When no base flood elevation or 100-year frequency flood elevation exists, the base flood or 100-year frequency flood elevation for a riverine SFHA shall be determined from a backwater model, such as HEC-II, WSP-2 or a dynamic model, such as HIP. The flood flows used in the hydraulic models shall be obtained from a hydrologic model, such as HEC-I, TR-20, HIP or by techniques presented in various publications prepared by the United States Geological Survey for estimating peak flood discharges. 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 watercourses draining more than one square mile. Along any watercourses draining more than one square mile, the above analyses shall be submitted to DWR for approval; once approved, it must be submitted to the State Water Survey Flood Plain Information Repository for filing. For a non-riverine SFHA, the base flood elevation shall be the historic flood of record, plus three feet, unless calculated by a detailed engineering study and approved by the Illinois State Water Survey.
(1981 Code, § 30.05) (Ord. 90-5, passed - -; Am. Ord. 06-53, passed 11-6-2006)