Sec. 3-1502, 3-1519, 3-1520

Other

• Maximum accessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structure area600 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  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: Not be used for human habitation; Be limited to no more than 600 square feet in total floor area;

• Anchoring of new construction and substantial improvements

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

• Maintain flood carrying capacity

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

• Minimize flood damage

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

• Flood openings requirements1 sq in per sq ftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  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.

• Flood-resistant materials

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

• Anchoring of manufactured homesManufactured homeA dwelling built in a factory to a federal standard and transported to the site.

  Manufactured homes shall be anchored to prevent flotation, collapse, or lateral movement.

• Non-residential floodproofing elevation2 ft

  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

• Non-residential lowest floor elevation18 inches

  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.

• Residential lowest floor elevation18 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 eighteen (18) inches.

• Sanitary sewage flood protection

  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.

• Space below lowest floor use

  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 only be used for parking of vehicles, building access, or limited storage of maintenance equipment

• Utility flood protection

  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 flood protection

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

• Water supply flood protection

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

• Notification of watercourse alteration

  in riverine areas, notification of the proposal shall be given by the applicant to all affected adjacent jurisdictions

• Permit for watercourse alteration

  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