This chapter’s protection standard is the base flood. The best available 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. The base flood elevation for each of the SFHAs delineated as an 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 and Frequency of Floods in Illinois, published by the U.S. Geological Survey, 1976.
(1983 Code, § 8.5-4) (Ord. 2549, passed 11-9-1989)