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materials or equipment. <br /> (c) 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 velocity <br />such that the depth (in feet) multiplied by the velocity (in feet per second) would exceed a product of four <br />upon occurrence of the regional (1% chance) flood. <br /> (3) Conditional uses. The following uses may be allowed as conditional uses following the standards <br />and procedures set forth in § 1103.11(4) of this chapter and further subject to the standards set forth in <br />division (4), if otherwise allowed in the underlying zoning district or any applicable overlay district. <br /> (a) Structures accessory to the uses listed in division (1) and the uses listed below. <br /> (b) Extraction and storage of sand, gravel and other materials. <br /> (c) Marinas, boat rentals, permaent docks, piers, wharves and water control structures, <br /> (d) Storage yards for equipment, machinery or materials. <br /> (e) Placement of fill or construction of fences that obstruct flood flows. Farm fences, as defined in § <br />1103.03, are permitted uses. <br /> (f) Travel-ready recreational vehicles meeting the exemption standards in § 1103.10(3). <br /> (g) 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 /> (4) Standards for floodway conditional uses. <br /> (a) 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 /> (b) Fill; storage of materials and equipment. <br /> 1. 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 /> 2. 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. Permanent sand <br />and gravel operations and similar uses must be covered by a long-term site development plan. <br /> 3. Temporary placement of fill, other materials, or equipment which would cause an increase to the <br />stage of the 1% percent chance or regional flood may only be allowed if the City Council has approved a <br />plan that assures removal of the materials from the floodway based upon the flood warning time available. <br /> (c) Accessory structures. <br /> 1. Accessory structures must not be designed for human habitation. <br /> 2. Accessory structures, if permitted, must be constructed and placed on the building site so as to <br />offer the minimum obstruction to the flow of flood waters: <br /> a. Whenever possible, structures must be constructed with the longitudinal axis parallel to the <br />direction of flood flow; and <br /> b. So far as practicable, structures must be placed approximately on the same flood flow lines as <br />those of adjoining structures. <br /> 3. Accessory structures shall be elevated on fill or structurally dry floodproofed in accordance with <br />the FP-1 or FP-2 flood-proofing classifications in the State Building Code. All floodproofed accessory <br />structures must meet the following additional standards: