(A) All structures, including accessory structures, must be elevated on fill so that the lowest floor, as defined, is at or above the regulatory flood protection elevation. The finished fill elevation for structures must be no lower than one (1) foot below the regulatory flood protection elevation and the fill must extend at the same elevation at least fifteen (15) feet beyond the outside limits of the structure. Elevations must be certified by a registered professional engineer, land surveyor or other qualified person designated by the community.
(B) Accessory structures. As an alternative to the fill requirements of division (A) above, structures accessory to the uses identified in § 152.050 may be designed to accommodate the inundation of floodwaters, meeting the following provisions:
(1) The accessory structure constitutes a minimal investment and satisfy the development requirements in § 152.031.
(2) Any enclosed accessory structure shall not exceed five hundred and seventy-six (576) square feet in size, and only be used for parking and storage. Any such structure shall be designed and certified by a registered professional engineer, or be designed in accordance with the following floodproofing standards:
(a) To allow for the equalization of hydrostatic pressure, there shall be a minimum of two (2) openings on at least two (2) sides of the structure and the bottom of all openings shall be no higher than one (1) foot above grade. The openings shall have a minimum net area of not less than one (1) square inch for every square foot of enclosed area subject to flooding, and shall allow automatic entry and exit of floodwaters without human intervention.
(C) The cumulative placement of fill or similar material on a parcel must not exceed one thousand (1,000) cubic yards, unless the fill is specifically intended to elevate a structure in accordance with (A) above, or if allowed as a conditional use under § 152.052(C) below.
(D) All service utilities, including ductwork, must be elevated or water-tight to prevent infiltration of floodwaters.
(E) All fill must be properly compacted and the slopes must be properly protected by the use of riprap, vegetative cover or other acceptable method.
(F) All new principal structures must have vehicular access at or above an elevation not more than two (2) feet below the regulatory flood protection elevation, or must have a flood warning/emergency evacuation plan acceptable to the City Council.
(G) Accessory uses such as yards, railroad tracks, and parking lots may be at an elevation lower than the regulatory flood protection elevation. However, any facilities used by employees or the general public must be designed with a flood warning system that provides adequate time for evacuation if the area is inundated to a depth and velocity such that the depth (in feet) multiplied by the velocity (in feet per second) would exceed a product of four (4) upon occurrence of the regional one percent (1%) chance flood.
(Ord. 481, passed 2-16-2021)