Franklin Zoning Ordinance

17 266 Chapter Floodplain Protection NATURAL RESOURCES Franklin Zoning Ordinance Effective December 8, 2020 standard engineering practices that the cumulative effect of the proposed encroachments or new development shall not result in any increase in the water surface elevation of the base flood elevation, velocities, or floodway widths during the occurrence of a base flood discharge at any point within the community. A Tennessee registered professional engineer must provide supporting technical data, using the same methodologies as in the effective Flood Insurance Study for the City and certification, thereof; and 2. 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 . D. Standards for Areas of Special Flood Hazard Zones AE with Established Base Flood Elevations but Without Floodways Designated Located within the special flood hazard areas established in Subsection 17.6.2, General Provisions, where streams exist with base flood data provided but where no floodways have been designated (Zones AE), the following provisions shall apply: 1. No encroachments, including fill material, new construction and substantial improvements shall be located within areas of special flood hazard, 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 flood more than one foot at any point within the community. The engineering certification should be supported by technical data that conforms to standard hydraulic engineering principles; and 2. 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. E. Standards for Streams Without Established Base Flood Elevations and Floodways (A Zones) Located within the special flood hazard areas established in Subsection 17.6.2, General Provisions, where streams exist, but no base flood data has been provided and where a floodway has not been delineated, the following provisions shall apply: 1. The floodplain administrator shall obtain, review, and reasonably utilize any base flood elevation and floodway data available from any Federal, State, or other sources, including data developed as a result of these regulations (see 2, below), as criteria for requiring that new construction, substantial improvements, or other development in approximate A Zones meet the requirements of Subsection 17.6.4, Provisions for Flood Hazard Reduction; 2. All new subdivision proposals and other proposed developments (including proposals for manufactured home parks and subdivisions) greater than 50 lots or five acres, whichever