(A) In all areas of special flood hazards:
(1) New construction and substantial improvements shall be anchored to prevent flotation, collapse, or lateral movement of the structure;
(2) New construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage;
(3) New construction and substantial improvements shall be constructed using methods and practices that minimize flood damage;
(4) Electrical, heating, ventilation, plumbing, and air-conditioning equipment and other service facilities, including duct work, shall be designed and/or otherwise elevated or located so as to prevent water from entering or accumulating within the components during conditions of flooding;
(5) All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system; and
(6) New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharge from the systems into flood waters.
(B) Specific building design and construction standards for residential construction. In addition to division (A) of this section:
(1) New construction and substantial improvement of residential structures shall have the lowest floor, including basement, elevated a minimum of one foot above the base flood elevation or three feet above highest adjacent grade where no BFE is defined; and
(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 be either be certified by a registered professional engineer or architect or must meet or exceed the following minimum criteria:
(3) A minimum of two openings, installed on at least two sides of each enclosed area, 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.
(a) The bottom of all openings shall be no higher than one foot above grade.
(b) Openings may be equipped with screens, louvers, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters.
(c) Engineered openings are permitted if the applicant submits certification from a registered professional engineer that the openings are sufficient to meet the design requirements of American Society of Civil Engineers, Flood Resistant Design and Construction Standard (ASCE 24).
(C) Specific building design and construction standards for nonresidential construction.
(1) In addition to division (A) of this section, new construction and substantial improvement of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including basement, elevated according to Table 2-1 the American Society of Civil Engineers, Flood Resistant Design and Construction Standard (ASCE 24); or, together with attendant utility and sanitary facilities, shall:
(a) Be floodproofed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water;
(b) Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and
(c) 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 division based on their development and/or review of the structural design, specifications and plans. Such certifications shall be provided to the Floodplain Administrator.
(2) Nonresidential structures that are elevated, not floodproofed, must meet residential standards described in divisions (A) and (B) of this section.
(3) Applicants floodproofing nonresidential buildings shall be notified that flood insurance premiums will be based on rates that are one foot below the floodproofed level (e.g. a building floodproofed to the base flood level will be rated as one foot below).
(D) Specific building design and construction standards for manufactured dwellings. In addition to divisions (A) and (B) of this section, new, replacement, and substantially improved manufactured dwellings are subject to the following standards:
(1) If the manufactured dwelling is supported on solid foundation walls, the ground area reserved for the placement of a manufactured dwelling shall be a minimum of one foot above BFE unless the foundation walls are designed to automatically equalize hydrostatic forces 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 meet or exceed the following minimum criteria:
(a) A minimum of two openings, on at least two sides, 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 above grade; and
(c) Openings may be equipped with screens, louvers, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters.
(2) The bottom of the longitudinal chassis frame 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).
(4) Electrical crossover connections shall be a minimum of 12 inches above BFE.
(5) Any utility systems must be elevated above BFE or designed so that floodwaters cannot enter or accumulate within the system components during flood conditions. Ductwork, in particular, must either be placed above the BFE or sealed from floodwaters. Only the crossover duct is exempt from this provision.
(Ord. 259, passed 3-17-2011; Ord. 286, passed 12-7-2017) Penalty, see § 151.999