Unified Development Ordinance, 4th supplement, September 2017

Part 10A: Unified Development Ordinance City of Raleigh, North Carolina 11 – 14 Effective Date: September 01, 2013 Supp. No. 2 CHAPTER 11. ​BUILDING AND HOUSING CODE | Article 11.4. Enforcement Provisions Sec. 11.4.6. ​​Limitation on Issuance of Permits for Construction in Floodprone Areas Sec. 11.4.5. Reserved for Future Use Sec. 11.4.6. Limitation on Issuance of Permits for Construction in Floodprone Areas A. No building permit shall be issued for any and all new construction or substantial improvement of residential structures located or to be located in floodprone areas, delineated as provided in Article 9.3. Floodprone Area Regulations , unless the lowest floor (including basement) and attendant mechanical, electrical, heating, ventilation, and air conditioning equipment, and any other service facility is elevated at least to the regulatory flood protection elevation. A registered professional engineer or architect shall certify on the building plans that all parts of the structure below the regulatory flood protection elevation are designed to withstand the flood depths, pressure, velocities, impact and uplift forces associated with the one-hundred-year flood at the location of the structure. All new construction and substantial improvements that fully enclose areas below the regulatory flood protection elevation which are usable solely for parking of vehicles, building access or storage in an area other than a basement and which are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of flood waters. Designs for meeting this requirement must be certified by a registered professional engineer or architect. Prior to the use or occupancy of the structure, a registered land surveyor shall certify to the nearest 1/10 of 1 foot in mean sea level datum the elevation of the lowest floor. B. No building permit shall be issued for any and all new construction or substantial improvement of nonresidential structures or residential accessory structures located or to be located in floodprone areas, delineated as provided in Article 9.3. Floodprone Area Regulations , unless: 1. The provisions of subsection A. above are met and attendant utility and sanitary facilities are floodproofed. Except in the case of accessory uses to dwellings with a cost of less than $5,000.00, prior to the use or occupancy of a structure, a registered land surveyor shall certify to the nearest 1/10 of 1 foot in mean sea level datum the elevations of the lowest floor; or 2. The provisions for an essentially dry floodproof class (W2) contained in "Floodproofing Regulations," most recent edition, published by the Office of the Chief of Engineers, U.S. Army, Washington, D.C., are met. Except in the case of accessory uses to dwellings with a cost of less than $5,000.00, prior to the use or occupancy of a structure, a registered land surveyor shall certify to the nearest 1/10 of 1 foot in mean sea level datum the elevations of the lowest floor; or 3. A registered professional engineer or architect certifies on the building plans that the walls and any parts of the structure below the regulatory flood protection elevation are substantially impermeable to the passage of water and that floodproofing methods used for a specified elevation in relation to mean sea level are adequate to withstand the flood depths, pressures, velocities, impact and uplift forces, and other factors associated with the 100-year flood at the location of the structure and that the structure is watertight, and attendant utility and sanitary facilities are floodproofed.

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