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(1) General farming, pasture, grazing, outdoor plant nurseries, horticulture, truck farming, forestry,
<br />sod farming, and wild crop harvesting.
<br />(2) Industrial -commercial loading areas, parking areas, and airport landing strips.
<br />(3) Open space uses, including but not limited to private and public golf courses, tennis courts,
<br />driving ranges, archery ranges, picnic grounds, boat launching ramps, swimming areas, parks,
<br />wildlife and nature preserves, game farms, fish hatcheries, shooting preserves, hunting and
<br />fishing areas, and single or multiple purpose recreational trails.
<br />(4) Residential lawns, gardens, parking areas, and play areas.
<br />(5) Railroads, streets, bridges, utility transmission lines and pipelines, provided that the Department
<br />of Natural Resources' Area Hydrologist is notified at least ten days prior to issuance of any
<br />permit, and that the standards in 117-183 (d)(1), 117-183 (d)(3) and 117-183 (d)(6) are met.
<br />(b) Standards for Floodway Permitted Uses:
<br />(1) The use must have a low flood damage potential.
<br />(2) With the exception of the uses listed in 117-183 (a)(5), the use must not obstruct flood flows or
<br />increase flood elevations and must not involve structures, fill, obstructions, excavations or storage
<br />of materials or equipment.
<br />(3) Any facility that will be used by employees or the general public must be designed with a flood
<br />warning system that provides adequate time for evacuation if the area is inundated to a depth and
<br />velocity such that the depth (in feet) multiplied by the velocity (in feet per second) would exceed
<br />a product of four upon occurrence of the regional (1% chance) flood.
<br />(c) Conditional Uses. The following uses may be allowed as conditional uses following the standards
<br />and procedures set forth in Section 117-189 (d) of this Subdivision and further subject to the
<br />standards set forth in Section 117-183 (d), if otherwise allowed in the underlying zoning district or
<br />any applicable overlay district.
<br />(1) Structures accessory to the uses listed in Section 117-183 (a) and the uses listed in subsections (c)
<br />(2) through (9) below.
<br />(2) Extraction and storage of sand, gravel, and other materials.
<br />(3) Marinas, boat rentals, docks, piers, wharves, and water control structures.
<br />(4) Storage yards for equipment, machinery, or materials.
<br />(5) Placement of fill or construction of fences that obstruct flood flows. Farm fences, as defined in
<br />Sec. 117-1, are permitted uses.
<br />(6) Travel -ready recreational vehicles meeting the exception standards in Section 117-188(b)(2).
<br />(7) Levees or dikes intended to protect agricultural crops for a frequency flood event equal to or less
<br />than the 10 -year frequency flood event.
<br />(d) Standards for Floodway Conditional Uses:
<br />(1) All uses. A conditional use must not cause any increase in the stage of the 1% chance or regional
<br />flood or cause an increase in flood damages in the reach or reaches affected.
<br />(2) Fill; storage of materials and equipment:
<br />a. The storage or processing of materials that are, in time of flooding, flammable, explosive, or
<br />potentially injurious to human, animal, or plant life is prohibited.
<br />b. Fill, dredge spoil, and other similar materials deposited or stored in the floodplain must be
<br />protected from erosion by vegetative cover, mulching, riprap or other acceptable method.
<br />Permanent sand and gravel operations and similar uses must be covered by a long-term site
<br />development plan.
<br />c. Temporary placement of fill, other materials, or equipment which would cause an increase to
<br />the stage of the 1% percent chance or regional flood may only be allowed if the city has
<br />approved a plan that assures removal of the materials from the floodway based upon the flood
<br />warning time available.
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