The floodplain areas within the jurisdiction of this chapter are hereby divided into the following districts:
1. Floodway District (FW) - those areas identified as Floodway on the Official Flood plain Map.
2. Floodway Fringe District (FF) - those areas identified as Zone AE on the Official Floodplain Map but excluding those areas identified as Floodway.
3. General Floodplain District (GF) - those areas identified as Zone A on the Official Flood plain Map.
The boundaries shall be as shown on the Official Floodplain Map. Within these districts, all development not allowed as permitted uses or permissible as conditional uses as defined in Chapter 86 and/or Chapter 90 of the Story County Land Development Regulations are prohibited unless a variance to the terms of this chapter and all other applicable sections of the Story County, Iowa Code of Ordinances is granted after due consideration by the Story County Board of Adjustment. In no case shall the Story County Board of Adjustment grant a variance to the requirements of this chapter, which authorizes a permitted use not allowed in a particular zoning district as established in the Story County Land Development Regulations.