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80.14   GF – GENERAL FLOODPLAIN DISTRICT.
   1.   Statement of Intent. The GF General Floodplain District reflects those areas that would be inundated during a one percent annual chance or greater flood, but for which specific flood elevations and Floodway and Floodway Fringe limits have not been established. It is the intent of the GF General Floodplain District to impose the development standards of the Floodway and Floodway Fringe after a determination is made to identify the Floodway and Floodway Fringe areas on an individual project basis.
   2.   Applicant’s Burden to Define Floodway and Floodway Fringe Boundary. Where one percent annual chance or greater flood data has not been provided in the Flood Insurance Study, the burden to demonstrate the boundary of the Floodway and Floodway Fringe rests on the applicant.
   3.   Permitted Development. The following development shall be permitted within the GF General Floodplain District to the extent they are not prohibited by any other ordinance or underlying zoning district as defined in the Story County Land Development Regulations and provided they do not include placement of structures, factory-built homes, fill or other obstructions, the storage of materials or equipment, excavation or alteration of a watercourse.
      A.   Agricultural uses such as general farming, pasture, grazing, outdoor plant nurseries, horticulture, viticulture, truck farming, forestry, sod farming and wild crop harvesting.
      B.   Industrial-commercial uses such as loading areas, parking areas, airport landing strips.
      C.   Private and public recreational uses such as golf courses, tennis courts, driving ranges, archery ranges, picnic grounds, boat launching ramps, swimming areas, parks, wildlife and nature preserves, game farms, fish hatcheries, shooting preserves, target ranges, trap and skeet ranges, hunting and fishing areas, hiking and horseback riding trails.
      D.   Residential uses such as lawns, gardens, parking areas and play areas.
      E.   Replacement or Newly Constructed Bridges and/or Culverts. The requirement to define the floodway and floodway fringe boundary does not apply to proposed replacement or newly constructed bridges and/or culverts wherein the bridge and/or culvert is:
         (1)   Located in a rural (unincorporated) area where the stream drains less than 100 square miles or in an urban (incorporated) area where the stream drains less than two square miles; and
         (2)   Not associated with a channel modification that constitutes a channel change as specified in 567-71.2(1)b, Iowa Administrative Code.
In cases of bridges and/or culverts not in compliance with the aforementioned criteria, as well as projects not associated with bridges and/or culverts located within the GF General Floodplain, the following development standards shall apply and review by the Iowa Department of Natural Resources is required.
   4.   Within the GF General Floodplain District, any development which involves placement of structures, factory-built homes, fill or other obstructions; the storage of materials or equipment; excavation; or alteration of a watercourse may be allowed only upon issuance of a zoning permit. All such development shall be reviewed by the Iowa Department of Natural Resources prior to Story County taking action on a zoning permit to determine:
      A.   Whether the land involved is either wholly or partly within the floodway or floodway fringe; and
      B.   The one percent annual chance flood level. The applicant shall be responsible for providing the Iowa Department of Natural Resources with sufficient technical information to make the determination.
   5.   Development Standards. The applicant for a Floodplain Development Permit shall provide sufficient technical information to make a determination as to whether the land involved is either partly or wholly within the Floodway and Floodway Fringe and to determine the one percent annual chance or greater flood elevation.
      A.   All development or portions thereof to be located in the Floodway shall meet the applicable standards of the FW Floodway, including no increase in base flood elevation.
      B.   All development or portions thereof to be located in the Floodway Fringe shall meet the standards of the FF Floodway Fringe.