265 NATURAL RESOURCES Floodplain Protection 17 Chapter Franklin Zoning Ordinance Effective January 1, 2023 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 to the floodplain administrator as set forth in Subsection 17.6.3, Administration. 3. Enclosures a. All new construction and substantial improvements that include fully enclosed areas formed by foundation and other exterior walls below the lowest floor that are subject to flooding, shall be designed to preclude finished living space and designed to allow for the entry and exit of flood waters to automatically equalize hydrostatic flood forces on exterior walls. b. Designs for complying with this requirement must either be certified by a Tennessee professional engineer or architect or meet or exceed the following minimum criteria: i. Provide a minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding; ii. The bottom of all openings shall be no higher than one foot above the finished grade; and iii. Openings may be equipped with screens, louvers, valves or other coverings or devices provided they permit the automatic flow of floodwaters in both directions. c. The enclosed area shall be the minimum necessary to allow for parking of vehicles, storage or building access; and d. The interior portion of such enclosed area shall not be finished or partitioned into separate rooms in such a way as to impede the movement of floodwaters and all such partitions shall comply with the provisions of Subsection 17.6.4, Provisions for Flood Hazard Reduction. 4. Standards for Manufactured Homes and Recreational Vehicles a. All manufactured homes placed or substantially improved must meet all the requirements of new construction when: i. On individual lots or parcels; ii. In expansions to existing manufactured home parks or subdivisions; or iii. In new or substantially improved manufactured home parks or subdivisions. b. All manufactured homes placed or substantially improved in an existing manufactured home park or subdivision must be elevated so that either: i. In AE Zones, with base flood elevations, the lowest floor of the manufactured home is elevated on a permanent foundation to no lower than one foot above the level of the base flood elevation
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