Article XXI, Section 21.4

Other

• AccessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structure limits600 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 Article XVII, Section 21.4.3.B or, if not elevated or dry floodproofed, shall be limited to no more than 600 square feet in total floor area.

• Anchoring to prevent flotation

  New construction and substantial improvements shall be built according to this ordinance and 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.

• Flood openings requirements

  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 (1) square inch for each square foot of enclosed area subject to flooding. The bottom of all required openings shall be no higher than one (1) foot above the adjacent grade.

• Manufactured homeManufactured homeA dwelling built in a factory to a federal standard and transported to the site. standards

  In zones A, AE, AH, and AO, 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 in Article 4, section 4.2 and section 4.3.

• Flood-resistant materials

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

• Methods to minimize flood damage

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

• Non-residential lowest floor elevation24 inches above BFE

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

• Non-residential floodproofing

  Non-residential 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 one foot above the BFE plus twenty-four inches are water tight...

• Recreational vehicle standards

  All recreational vehicles placed on sites must either be on the site for fewer than 180 consecutive days, be fully licensed and ready for highway use, or meet all the requirements for manufactured homes.

• Residential lowest floor elevation24 inches above BFE

  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 twenty-four inches.

• Sanitary sewage system design

  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 restrictions

  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...

• Subdivision proposals

  All subdivision proposals shall be consistent with the need to minimize flood damage; have public utilities and facilities located and constructed to minimize flood damage; have adequate drainage; and base flood elevation data shall be obtained for proposals exceeding five lots or five acres.

• Utility equipment elevation

  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.

• No varianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. for accessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structure >600 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.600 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  No variance shall be granted for an accessory structure exceeding 600 square feet in total floor area.

• On-site waste disposal

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

• Water supply system design

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

• 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