267 NATURAL RESOURCES Floodplain Protection 17 Chapter Franklin Zoning Ordinance Effective January 1, 2023 increased flood heights and velocities. Therefore, the following provisions shall apply: 1. Encroachments are prohibited, including fill, new construction, substantial improvements or other development within the adopted regulatory floodway. Development may be permitted, however, provided it is demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practice that the encroachment shall not result in any increase in flood levels or floodway widths during a base flood discharge. A registered professional engineer must provide supporting technical data and certification, thereof; 2. A community may permit encroachments within the adopted regulatory floodway that would result in an increase in base flood elevations, provided that the applicant first applies for a conditional letter of map revision (CLOMR) and floodway revision, fulfills the requirements for such revisions as established under the provisions of T.C.A § 65.12, and receives the approval of FEMA; 3. ONLY if Clauses 17.6.4.C.1 and 2 above are satisfied, then any new construction or substantial improvement shall comply with all other applicable flood hazard reduction provisions of Paragraphs 17.6.4.A, General Standards, and 17.6.4.B, Specific Standards. 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. Require until a regulatory floodway is designated, that no new construction, substantial, or other development, including fill shall be permitted within Zone AE on the community’s FIRM, unless it is demonstrated through hydrologic and hydraulic analyses performed 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. 2. A community may permit encroachments within Zones AE on the community’s FIRM, that would result in an increase in the water surface elevation of the base flood, provided that the applicant first applies for a conditional letter of map revision (CLOMR) and floodway revision, fulfills the requirements for such revisions as established under the provisions of T.C.A § 65.12, and receives the approval of FEMA; 3. ONLY if Clauses 17.6.4.D.1 and 2 above are satisfied, then any new construction or substantial improvement shall comply with all other applicable flood hazard reduction provisions of Paragraphs 17.6.4.A, General Standards, and 17.6.4.B, Specific Standards. E. Standards for Streams Without Established Base Flood Elevations and Floodways (A Zones)
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