Wake Forest Unified Development Ordinance - July 2022

Erosion, Flood, Stormwater & Watershed Standards 12.4 Flood Damage Prevention



The time frame prior to the event at which a structure will be removed (i.e. minimum of 72 hours before landfall of a hurricane or immediately upon flood warning notification);

iv. A copy of the contract or other suitable instrument with the entity responsible for physical removal of the structure; and v. Designation, accompanied by documentation, of a location outside the Special Flood Hazard Area to which the structure will be moved.

C. Standards for Floodplains Without Established Base Flood Elevations: Within the Special Flood Hazard Areas designated as Approximate Zone A where no Base Flood Elevation (BFE) data has been provided by FEMA, the following provisions shall apply: 1. No encroachments, including fill, new construction, substantial improvements, or new development shall be permitted within a distance of 20 feet, each side, from the top of bank or five (5) times the width of the stream, whichever is greater, unless certification with supporting technical data by a registered professional engineer is provided demonstrating that such encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge. 2. The BFE used in determining the Regulatory Flood Protection Elevation shall be determined based on one of the following criteria set in priority order: a. If Base Flood Elevation (BFE) data is available from other sources, all new construction and substantial improvements within such areas shall also comply with all applicable provisions of this ordinance and shall be elevated or in accordance with elevations established by the Floodplain Administrator. b. All subdivision, manufactured home park and other development

proposals shall provide Base Flood Elevation (BFE) data if development is greater than five (5) acres or has more than 50 lots/manufactured home sites. Such Base Flood Elevation (BFE) data shall be adopted by reference to be utilized in implementing this ordinance.

D. Floodway and Non-Encroachment Areas: Areas designated as floodways or non- encroachment areas are located within the Special Flood Hazard Areas. The floodways and non-encroachment areas are extremely hazardous areas due to the velocity of floodwaters that have erosion potential and carry debris and potential projectiles. The following additional provisions shall apply to all development within such areas: 1. No encroachments, including fill, new construction, substantial improvements, and other developments shall be permitted unless it has been demonstrated that: a. the proposed encroachment would not result in any increase in the flood levels during the occurrence of the base flood, based on hydrologic and hydraulic analyses performed in accordance with standard engineering practice and presented to the Floodplain Administrator prior to issuance of floodplain development permit, or b. if an increase in base flood will occur due to the proposed encroachments, an evaluation of alternatives, which would not result in the base flood increase, should be provided for review by the Floodplain Administrator demonstrating why these alternatives are not feasible. Upon approval by the Floodplain Administrator, a Conditional Letter of Map Revision (CLOMR) must be approved by FEMA. A Letter of Map Revision (LOMR) must also be obtained upon completion of the proposed encroachment. c. No manufactured or mobile homes shall be permitted, except an existing manufactured home subdivision or mobile home park. A replacement

Town of Wake Forest Unified Development Ordinance – July 19, 2022


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