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1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br />24 <br />25 <br />26 <br />27 <br />28 <br />29 <br />30 <br />31 <br />32 <br />33 <br />34 <br />35 <br />36 <br />37 <br />38 <br />39 <br />40 <br />41 <br />42 <br />43 <br />44 <br />45 <br />46 <br />47 <br />48 <br />49 <br />(6) Floodway developments must not adversely affect the hydraulic capacity of the channel and <br />adjoining floodplain of any tributary watercourse or drainage system. <br />924 Flood Fringe District (FF) <br />(A) Permitted uses. Permitted uses are those uses of land or structures allowed in the underlying zoning <br />district(s) that comply with the standards in subsection (b) below. <br />(B) Standards for flood fringe permitted uses. <br />(1) All structures, including accessory structures, must be elevated on fill so that the lowest floor, <br />as defined, is at or above the regulatory flood protection elevation. The finished fill elevation <br />for structures must be no lower than one foot below the regulatory flood protection elevation <br />and the fill must extend at the same elevation at least 15 feet beyond the outside limits of the <br />structure. <br />a. All service utilities, including ductwork, must be elevated or water -tight to prevent infiltration <br />of floodwaters. <br />b. As an alternative to elevation on fill, an accessory structure that constitutes a minimal <br />investment and that does not exceed 576 square feet in size may be internally floodproofed <br />in accordance with [section] 117-183(d)(3). <br />(2) The cumulative placement of fill or similar material on a parcel must not exceed 1,000 cubic <br />yards, unless the fill is specifically intended to elevate a structure in accordance with subsection <br />(a) above, or if allowed as a conditional use under section 117-184(c)(3) below. <br />(3) The storage of any materials or equipment must be elevated on fill to the regulatory flood <br />protection elevation. <br />(4) 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 />(5) Fill must be properly compacted and the slopes must be properly protected by the use of riprap, <br />vegetative cover or other acceptable method. <br />(6) All new principal structures must have vehicular access at or above an elevation not more than <br />two feet below the regulatory flood protection elevation, or must have a flood <br />warning/emergency evacuation plan acceptable to the city. <br />(7) Accessory uses such as yards, railroad tracks, and parking lots may be at an elevation lower <br />than the regulatory flood protection elevation. However, any facilities used by employees or <br />the general public must be designed with a flood warning system that provides adequate time <br />for evacuation if the area is inundated to a depth and velocity such that the depth (in feet) <br />multiplied by the velocity (in feet per second) would exceed a product of four upon occurrence <br />of the regional (one percent chance) flood. <br />(8) Interference with normal manufacturing/industrial plant operations must be minimized, <br />especially along streams having protracted flood durations. In considering permit applications, <br />due consideration must be given to the needs of industries with operations that require a <br />floodplain location. <br />(9) Flood fringe developments must not adversely affect the hydraulic capacity of the channel and <br />adjoining floodplain of any tributary watercourse or drainage system. <br />(10) Manufactured homes and recreational vehicles must meet the standards of section 117-188. <br />(C) Conditional uses. The following uses and activities may be allowed as conditional uses, if allowed in <br />the underlying zoning district(s) or any applicable overlay district, following the procedures in section <br />117-189(d). conditional uses must meet the standards in [subsections] (b)(4) through (10) above and <br />section 117-184(d). <br />(1) Any structure that is not elevated on fill or floodproofed in accordance with section 117- <br />184(b)(1)a. and b. <br />(2) Storage of any material or equipment below the regulatory flood protection elevation. <br />Page 117 of 147 <br />