Sec. 48-711 and Sec. 48-712

Accessory structures in the SFHA shall comply with the elevation requirements and other requirements of subdivision IV, subsection 48-712(2) or, if not elevated or dry floodproofed, shall: not be used for human habitation; be limited to no more than 600 square feet in total floor area; be useable only for parking of vehicles or limited storage; be constructed with flood damage-resistant materials below the base flood elevation; be constructed and placed to offer the minimum resistance to the flow of floodwaters; be anchored to prevent flotation; have electrical service and mechanical equipment elevated to or above the base flood elevation; and be provided with flood openings meeting criteria.

New construction and substantial improvements shall be built according to this division and the VA USBC, and anchored to prevent flotation, collapse, or lateral movement of the structure.

Provide a minimum of two openings on different sides of each enclosed area subject to flooding. The total net area of all openings must be at least one square inch for each square foot of enclosed area subject to flooding. The bottom of all required openings shall be no higher than one foot above the adjacent grade.

New construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage.

New construction or substantial improvements shall be constructed by methods and practices that minimize flood damage.

Non-residential buildings located in all A1-30, AE, and AH zones may be floodproofed in lieu of being elevated provided that all areas of the building components below the elevation corresponding to the BFE plus two feet are water tight with walls substantially impermeable to the passage of water, and use structural components having the capability of resisting hydrostatic and hydrodynamic loads and the effect of buoyancy.

New construction or substantial improvement of any commercial, industrial, or non-residential building (or manufactured home) shall have the lowest floor, including basement, elevated to or above the base flood level plus 18 inches.

New construction or substantial improvement of any residential structure (including manufactured homes) in Zones A1-30, AE, AH, and A with detailed base flood elevations shall have the lowest floor, including basement, elevated to or above the base flood level plus 18 inches.

New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the systems and discharges from the systems into floodwaters.

In Zones A, AE, AH, AO, and A1-A30, fully enclosed areas, of new construction or substantially improved structures, which are below the regulatory flood protection elevation shall not be designed or used for human habitation, but shall be used solely for parking of vehicles, building access, or limited storage of maintenance equipment.

Electrical, heating, ventilation, plumbing, air conditioning equipment, and other service facilities, including duct work, shall be designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding.

On-site waste disposal systems shall be located and constructed to avoid impairment to them or contamination from them during flooding.

New and replacement water supply systems shall be designed to minimize or eliminate infiltration of floodwaters into the system.