19.6-76.4.2, 19.6-76.4.3, 19.6-76.4.4, 19.6-76.5.1, 19.6-76.6.1

Other

• AccessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structure maximum 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 this article 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 article 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 requirements1 sq in/sq ftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  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.

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

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

• 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 elevation or floodproofing18 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. Non-residential buildings may be floodproofed to BFE+2 feet.

• Non-residential floodproofing to BFE+2 feet2 feet

  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 watertight...

• Permit required

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

• 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 18 inches.

• Sanitary sewage systems

  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.

• Base flood elevation data for subdivisions

  Base flood elevation data shall be obtained from other sources or developed using detailed methodologies... for subdivision proposals and other proposed development proposals (including manufactured home parks and subdivisions) that exceed five lots or five acres, whichever is the lesser.

• Substantial improvement threshold50 pct

  The change, when added to all the changes made during a rolling five-year period does not constitute 50% of the structure's value.

• Utilities designed to prevent water entry

  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.

• VarianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. lot size limit0.5 acreacre43,560 square feet — about the size of an American football field without the end zones.

  Variances may be issued by the Board of Zoning Appeals for new construction and substantial improvements to be erected on a lot of 1/2 acre or less in size contiguous to and surrounded by lots with existing structures constructed below the base flood level

• 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 systems

  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