(A) This subchapter'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 shall finance the detailed engineering study needed to replace the existing data with better data and submit it to the FEMA and IDNR/OWR for approval prior to any development of the site.
(B) The base flood elevation for the floodplains of Richland, Loop and Silver Creeks shall be as delineated on the 100-year flood profiles in the countywide Flood Insurance Study of St. Clair County prepared by the Federal Emergency Management Agency and 11-5-2003.
(C) The base flood elevation for each floodplain delineated as an "Ali Zone" or "AO Zone" shall be that elevation (or depth) delineated on the countywide Flood Insurance Rate Map of St. Clair County dated 11-5-2003.
(D) The base flood elevation for each of the remaining floodplains delineated as an "A Zone" on the countywide Flood Insurance Rate Map of St. Clair County shall be according to the best data available from federal, state or other sources. Should no other data exist, an engineering study must be financed to determine base flood elevations.
(E) The base flood elevation for the floodplains of those parts of unincorporated St. Clair County that are within the extraterritorial jurisdiction of the village, or that may be annexed into the village, shall be as delineated on the 100-year flood profiles of the countywide Flood Insurance Study of St. Clair County prepared by the Federal Emergency Management Agency and dated 11-5-2003.