In all areas of special flood hazard where base flood elevation data has been provided as set forth in section 11-1-4, "Basis For Establishing Areas Of Special Flood Hazard", or subsection 11-1-5C2, "Use Of Other Base Flood Data", of this chapter, the following provisions are required:
A. Residential Construction:
1. New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to or above base flood elevation; in AO Zones, elevate lowest floor to the number of feet above the highest adjacent ground equal to the AO Zone depth number.
2. Fully enclosed areas below the lowest floor that are subject to flooding are prohibited, or shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or must meet or exceed the following minimum criteria:
a. A minimum of two (2) openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided.
b. The bottom of all openings shall be no higher than one foot (1') above grade.
c. Openings may be equipped with screens, louvers, or other coverings or devices; provided, that they permit the automatic entry and exit of floodwaters.
B. Nonresidential Construction: New construction and substantial improvement of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including basement, elevated to the level of the base flood elevation; in AO Zones, elevate lowest floor to the number of feet above the highest adjacent ground equal to the AO Zone depth number; together with attendant utility and sanitary facilities, shall:
1. Be floodproofed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water;
2. Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and
3. Be certified by a registered professional engineer or architect that the standards of this subsection are satisfied. Such certifications shall be provided to the official as set in subsection 11-1-5C3b of this chapter.
4. Nonresidential structures that are elevated, not floodproofed, must meet the same standards for space below the lowest floor as described in subsection A2 of this section.
5. Applicants floodproofing nonresidential buildings shall be notified that flood insurance premiums will be based on rates that are one foot (1') below the floodproofed level (e.g., a building constructed to the base flood level will be rated as 1 foot below that level).
C. Manufactured Homes: All manufactured homes to be placed or substantially improved within Zones A1-30, AH, and AE shall be elevated on a permanent foundation such that the lowest floor of the manufactured home is at or above the base flood elevation and be securely anchored to an adequate foundation system in accordance with the provisions of subsection 11-1-6A2 of this chapter. (Ord. 87-7, 6-15-1987)
D. Recreational Vehicles: Recreational vehicles placed on sites within Zones A1-A30, AH, and AE on a community FIRM either must:
1. Be on site for fewer than one hundred eighty (180) consecutive days; or
2. Be fully licensed and ready for highway use, on its wheels or jacking system, is attached to the site only by quick disconnect type utilities and security devices, and has no permanently attached additions; or
3. Meet the requirements of subsection C of this section and the elevation and anchoring requirements for manufactured homes. (Ord. 98-08, 8-14-1998)
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