(A) This chapter’s protection standard is the base flood. The best available base flood data are listed below. Whenever a party disagrees with the best available data, the party may finance the detailed engineering study needed to replace existing data with better data and submit it to the State Water Survey and the Federal Emergency Management Agency.
(B) The base flood elevation for each of the SFHA’s delineated as an unnumbered A Zone on the Flood Insurance Rate Map of the city shall be according to the best data available to the State Water Survey Floodplain Information Repository. When no base flood elevation exists, the base flood elevation shall be the 100-year flood depth calculated according to the formulas presented in Depth & Frequency of Floods in Illinois published by U.S. Geological Survey, 1976.
(C) The base flood elevation for the SFHAs of those parts of the unincorporated county that are within the extraterritorial jurisdiction of the city or that may be annexed into the city shall be according to the best data available to the State Water Survey Floodplain Information Repository.
(1978 Code, § 15.08.050) (Ord. 91-13, passed - -1991)