International Building Code Section 1612.3 is hereby amended to read as follows:

1612.3 Establishment of flood hazard areas. To establish flood hazard areas, the applicable governing authority shall adopt a flood hazard map and supporting data. The flood hazard map shall include, at a minimum, areas of special flood hazard as identified by the Federal Emergency Management Agency in an engineering report entitled “The Flood Insurance Study (FIS) for King County, Washington, and Incorporated Areas,” dated August 19, 2020, and any revisions thereto, with the accompanying Flood Insurance Rate Maps (FIRMs), dated August 19, 2020, and any revisions thereto. The adopted flood hazard map and supporting data are hereby adopted by reference and declared to be part of this section.

1612.3.1 Design flood elevations. Where design flood elevations are not included in the flood hazard areas established in Section 1612.3, or where floodways are not designated, the building official is authorized to require the applicant to do one of the following:

1. Obtain and reasonably utilize any design flood elevation and floodway data available from a federal, state or other source.

2. Determine the design flood elevation or floodway in accordance with City of Bellevue Land Use Code Section 20.25H.175A and Surface Water Engineering Standards, Section D4-04.5, “Floodplain/Floodway Analysis,” to define special flood hazard areas. Determinations shall be undertaken by a registered design professional who shall document that the technical methods used reflect currently accepted engineering practice.

1612.3.2 Determination of impacts. In riverine flood hazard areas where design flood elevations are specified but floodways have not been designated, the applicant shall provide a floodway analysis that demonstrates that the proposed work will meet City of Bellevue Surface Water Engineering Standards, Section D4-04.5, “Floodplain/Floodway Analysis.”