Sec. 3-1517, Sec. 3-1518, Sec. 3-1519, Sec. 3-1520

Accessory structures in the SFHA shall comply with the elevation requirements and other requirements of 3-1520(B), or if not elevated or dryproofed shall: a) Not be used for human habitation; b) Be limited to no more than 600 square feet in total floor area; c) Be usable only for parking of vehicles or limited storage; d) Be constructed with flood damage-resistant materials below the base flood elevation; e) Be constructed and placed to offer the minimum resistance to the flow of floodwaters; f) Be anchored to prevent flotation; g) Have electrical service and mechanical equipment elevated to or above the base flood elevation; h) Shall be provided with flood openings.

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

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

Manufactured homes shall be anchored to prevent flotation, collapse, or lateral movement. Methods of anchoring may include, but are not limited to, use of over-the-top or frame ties to ground anchors.

In zones A, AE, AH, AO, V1-30, VE, and V, all manufactured homes placed, or substantially improved, on individual lots or parcels, must meet all the requirements for new construction, including the elevation and anchoring requirements.

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

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. Buildings located in all A1—30, AE, and AH zones may be flood-proofed 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.

All recreational vehicles placed on sites must either: a) Be on the site for fewer than 180 consecutive days, be fully licensed and ready for highway use; or b) Meet all the requirements for manufactured homes.

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 eighteen (18) inches.

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

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: 1) Not be designed or used for human habitation, but shall only be used for parking of vehicles, building access, or limited storage; 2) Be constructed entirely of flood resistant materials; 3) Include measures to automatically equalize hydrostatic flood forces on walls.

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 flood waters into the system.

The flood carrying capacity within an altered or relocated portion of any watercourse shall be maintained.

Prior to any proposed alteration or relocation of any channels or of any watercourse, stream, etc., within this jurisdiction a permit shall be obtained from the U.S. Corps of Engineers, the Virginia Department of Environmental Quality, and the Virginia Marine Resources Commission.

All uses, activities, and development occurring within any floodplain district, including placement of manufactured homes, shall be undertaken only upon the issuance of a zoning permit.

The floodplain districts described above shall be overlays to the existing underlying districts as shown on the official zoning ordinance map, and as such, the provisions for the floodplain districts shall serve as a supplement to the underlying district provisions. If there is any conflict between the provisions or requirements of the floodplain districts and those of any underlying district, the more restrictive provisions and/or those pertaining to the floodplain districts shall apply.