Sec. 86-567(c)(2) and Sec. 86-571

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 this section 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; shall be provided with flood openings...

• CLOMR required for increase >1 ft1 ft

  Development activities in zone AE which increase the water surface elevation of the base flood by more than one foot may be allowed, provided that the applicant first applies, with King William County's endorsement, for a CLOMR, and receives the approval of the FEMA.

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

  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. 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.

• No increase in base flood elevation1 ft

  No new construction, substantial improvements, or other development (including fill) shall be permitted within the areas of special flood hazard, designated as zone AE on the FIRM, unless it is demonstrated that the cumulative effect of the proposed development, when combined with all other existing and anticipated development, will not increase the water surface elevation of the base flood more than one foot at any point within King William County.

• Nonresidential lowest floor elevation18 inches

  New construction or substantial improvement of any commercial, industrial, or nonresidential building (or manufactured home) shall have the lowest floor, including basement, elevated to or above 18 inches above the base flood level. Buildings located in all AE zones may be floodproofed in lieu of being elevated provided that all areas of the building components below the elevation corresponding to the base flood elevation (BFE) plus two feet are watertight...

• Residential lowest floor elevation18 inches

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

• Space below lowest floor requirements

  In zones A and AE, 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... shall be constructed entirely of flood-resistant materials... include measures to automatically equalize hydrostatic flood forces... minimum of two openings on different sides... total net area of all openings must be at least one square inch for each square foot of enclosed area... bottom of all required openings shall be no higher than one foot above the adjacent grade.