263 NATURAL RESOURCES Floodplain Protection 17 Chapter Franklin Zoning Ordinance Effective January 1, 2022 construction and substantial improvement of any residential building (or manufactured home) shall have the lowest floor, including basement, elevated to no lower than three feet above the base flood elevation. Should solid foundation perimeter walls be used to elevate a structure, openings sufficient to facilitate equalization of flood hydrostatic forces on both sides of exterior walls shall be provided in accordance with the standards of Clause 17.6.4.B.3, Enclosures, Within approximate A Zones where base flood elevations have not been established and where alternative data is not available, the floodplain administrator shall require the lowest floor of a building to be elevated to a level of at least three feet above the highest adjacent grade. Should solid foundation perimeter walls be used to elevate a structure, openings sufficient to facilitate equalization of flood hydrostatic forces on both sides of exterior walls shall be provided in accordance with the standards of Clause 17.6.4.B.3, Enclosures. 2. Nonresidential Structures a. In AE Zones, where base flood elevation data is available, new construction and substantial improvement of any nonresidential building shall have the lowest floor, including basement, elevated or floodproofed to no lower than one foot above the level of the base flood elevation. Should solid foundation perimeter walls be used to elevate a structure, openings sufficient to facilitate equalization of flood hydrostatic forces on both sides of exterior walls shall be provided in accordance with the standards of Clause 17.6.4.B.3, Enclosures. b. In approximate A Zones, where base flood elevations have not been established and where alternative data is not available, new construction and substantial improvement of any nonresidential building shall have the lowest floor, including basement, elevated or floodproofed tono lower than three feet above the highest adjacent grade. Should solid foundation perimeter walls be used to elevate a structure, openings sufficient to facilitate equalization of flood hydrostatic forces on both sides of exterior walls shall be provided in accordance with the standards of Clause 17.6.4.B.3, Enclosures. c. Nonresidential buildings located in all A Zones may be floodproofed, in lieu of being elevated, provided that all areas of the building below the required elevation are watertight, with walls substantially impermeable to the passage of water, and are built with structural components having the capability of resisting hydrostatic and hydrodynamic loads and the effects of buoyancy. A Tennessee registered professional engineer or architect shall certify that the design and methods of construction are in accordance with accepted standards of practice for meeting the provisions above, and shall provide such certification
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