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(3) All structures must be constructed with electrical, heating, ventilation, plumbing, and air
<br />conditioning equipment and other service facilities that are designed and/or located so as to
<br />prevent water from entering or accumulating within the components during conditions of
<br />flooding.
<br />(4) As -built elevations for elevated or floodproofed structures must be certified by ground surveys
<br />and flood -proofing techniques must be designed and certified by a registered professional
<br />engineer or architect as specified in the general provisions of this Subdivision and specifically as
<br />stated in Section 117-189.
<br />Sec. 117-183. — Floodway District (FW)
<br />(a) Permitted uses. The following uses, subject to the standards set forth in 117-183 (b), are permitted
<br />uses if otherwise allowed in the underlying zoning district or any applicable overlay district:
<br />(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:
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