425.080 Specific Standards.
A. In all areas of special flood hazards where base flood elevation data has been provided (Zones A1-30, AH, and AE) as set forth in Section 425.040(B), Basis for Establishing the Areas of Special Flood Hazard, or Section 425.050(C)(2), Use of Other Base Flood Data (in A and V Zones), the following provisions are required:
(1) Residential construction;
(2) New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to a minimum of one (1) foot above the base flood elevation.
B. 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:
(1) A minimum of two (2) openings having a total net area of not less than one (1) square inch for every square foot of enclosed area subject to flooding shall be provided.
(2) The bottom of all openings shall be no higher than one (1) foot above grade.
(3) Openings may be equipped with screens, louvers, or other coverings or devices; provided, that they permit the automatic entry and exit of floodwaters.
(4) If a building has more than one (1) enclosed area below the lowest floor, each area shall be equipped with adequate flood openings.
C. 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 a minimum according to ASCE 24; or, 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;
(3) Be certified by a registered professional engineer or architect that the design and methods of construction are in accordance with accepted standards of practice for meeting provisions of this subsection based on their development and/or review of the structural design, specifications and plans. Such certifications shall be provided to the official as set forth in Section 425.050(C)(4)(d);
(4) Nonresidential structures that are elevated, not floodproofed, must meet the same standards for space below the lowest floor as described in subsection (B) of this section;
(5) Applicants floodproofing nonresidential buildings shall be notified that flood insurance premiums will be based on rates that are one (1) foot below the floodproofed level (e.g., a building floodproofed to the base flood level will be rated as one (1) foot below);
(6) Applicants shall supply a maintenance plan for the entire structure to include but not limited to: exterior envelope of structure; all penetrations to the exterior of the structure; all shields, gates, barriers, or components designed to provide floodproofing protection to the structure; all seals or gaskets for shields, gates, barriers, or components; and, the location of all shields, gates, barriers, and components as well as all associated hardware, and any materials or specialized tools necessary to seal the structure;
(7) Applicants shall supply an emergency action plan (EAP) for the installation and sealing of the structure prior to a flooding event that clearly identifies what triggers the EAP and who is responsible for enacting the EAP.
D. Manufactured Dwellings.
(1) Manufactured dwellings supported on solid foundation walls shall be constructed with flood openings that comply with subsection (B) of this section;
(2) The bottom of the longitudinal chassis frame beam in A zones (excluding coastal A zones), shall be at or above BFE;
(3) The manufactured dwelling shall be anchored to prevent flotation, collapse, and lateral movement during the base flood. Anchoring methods may include, but are not limited to, use of over-the-top or frame ties to ground anchors (reference FEMA’s “Manufactured Home Installation in Flood Hazard Areas” guidebook for additional techniques); and
(4) Electrical crossover connections shall be a minimum of twelve (12) inches above BFE.
E. Recreational Vehicles. Recreational vehicles placed on sites are required to:
(1) Be on the site for fewer than one hundred eighty (180) consecutive days; and
(2) Be fully licensed and ready for highway use, on its wheels or jacking system, be attached to the site only by quick disconnect type utilities and security devices, and have no permanently attached additions; or
(3) Meet the requirements of subsection (D) of this section and the elevation and anchoring requirements for manufactured homes. (Ord. 2-2018 § 2 (Att. B))