Franklin Zoning Ordinance

267 NATURAL RESOURCES Floodplain Protection 17 Chapter Franklin Zoning Ordinance Effective December 8, 2020 is the lesser, shall include within such proposals base flood elevation data ; 3. Within approximate A Zones, where base flood elevations have not been established and where such data is not available from other sources, require the lowest floor of a building to be elevated or floodproofed to a level of at least three feet above the highest adjacent grade. All applicable data including elevations or floodproofing certifications shall be recorded as set forth in Paragraph 17.6.3.B, Permit Procedures. Openings sufficient to facilitate automatic equalization of hydrostatic flood forces on exterior walls shall be provided in accordance with the standards of Subsection 17.6.4, Provisions for Flood Hazard Reduction ; 4. Within approximate A Zones, where base flood elevations have not been established and where such data is not available from other sources, no encroachments, including structures or fill material, shall be located within an area equal to the width of the stream or 20 feet, whichever is greater, measured from the top of the stream bank, unless certification by a Tennessee registered professional engineer is provided demonstrating that the cumulative effect of the proposed development, when combined with all other existing and anticipated development, will not increase the water surface elevation of the base floodmore than one foot at any point within the City. The engineering certification should be supported by technical data that conforms to standard hydraulic engineering principles; and 5. New construction and substantial improvements of buildings, where permitted, shall comply with all applicable flood hazard reduction provisions of Subsection 17.6.4, Provisions for Flood Hazard Reduction. Within approximate A Zones, those subsections of Subsection 17.6.4, dealing with the alteration or relocation of a watercourse, shall assure watercourse carrying capacities are maintained and manufactured home provisions are complied with as required. F. Standards for Areas of Shallow Flooding (AO and AH Zones) Located within the special flood hazard areas established in Subsection 17.6.2, General Provisions, are areas designated as shallow flooding areas. These areas have special flood hazards associated with base flood depths of one to three feet where a clearly defined channel does not exist and where the path of flooding is unpredictable and indeterminate; therefore, the following provisions, in addition to those set forth in Subsection 17.6.4, shall apply: 1. All new construction and substantial improvements of residential and nonresidential structures shall have the lowest floor , including basement, elevated to at least one foot above as many feet as the depth number specified on the FIRM, in feet, above the highest adjacent grade. If no flood depth number is specified on the FIRM, the lowest floor, including basement, shall be elevated to at least three feet above the highest adjacent grade. Openings sufficient to facilitate automatic equalization of hydrostatic flood forces on exterior walls shall be provided in accordance with standards