Sec. 106-367 through 106-370

Other

• Flood resistant materials required

  Be constructed entirely of flood resistant materials below the regulatory flood protection elevation.

• Enclosed space below lowest floor use restriction

  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 used in connection with the premises.

• Existing structure modification 50% or more

  The modification, alteration, repair, reconstruction, or improvement of any kind to a structure and/or use, regardless of its location in a floodplain area to an extent or amount of 50 percent or more of its market value shall be undertaken only in full compliance with this article and shall require the entire structure to conform to the VA USBC and this article.

• Existing structure modification less than 50%

  Any modification, alteration, repair, reconstruction, or improvement of any kind to a structure and/or use located in any floodplain areas to an extent or amount of less than 50 percent of its market value shall conform to the VA USBC and this article.

• Floodproofing elevation above base flood level1 ft

  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 BFE plus one foot are watertight with walls substantially impermeable to the passage of water, and use structural components having the capability of resisting hydrostatic and hydrodynamic loads and the effect of buoyancy.

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

  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 sections 106-364(a)(6), 106-366 and 106-367.

• Maximum opening bottom heightMaximum heightThe tallest a building may be, given in feet, in storeys, or both — whichever binds first. above grade1 ft

  The bottom of all required openings shall be no higher than one foot above the adjacent grade.

• Minimum opening net area ratio1 sqin/sqftsq 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.

• Minimum openings per enclosed area2 count

  Provide a minimum of two openings on different sides of each enclosed area subject to flooding.

• Non-residential lowest floor elevation above base flood level2 ft

  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 a minimum of two feet above the base flood level.

• Residential lowest floor elevation above base flood level2 ft

  New construction or substantial improvement of any residential structure (including manufactured homes) in AE zones with detailed base flood elevations shall have the lowest floor, including basement, elevated to two feet above the base flood level.

• Recreational vehicle 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.

• Subdivision BFE data threshold

  Base flood elevation data shall be obtained from other sources or developed using detailed methodologies, hydraulic and hydrologic analysis, comparable to those contained in a flood insurance study for subdivision proposals and other proposed development proposals (including manufactured home parks and subdivisions) that exceed 50 lots or five acres, whichever is the lesser.

• Subdivision drainage

  All subdivision proposals shall have adequate drainage provided to reduce exposure to flood hazards.

• Subdivision flood damage minimization

  All subdivision proposals shall be consistent with the need to minimize flood damage.

• Subdivision public utilitiesPublic utilitiesInfrastructure serving the wider area — substations, pump stations, towers.

  All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage.

• VarianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. factors

  Variances shall be issued only upon a showing of good and sufficient cause, exceptional hardship, and no additional threats to public safety, extraordinary public expense, nuisances, fraud, or conflict with local laws.

• VarianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. floodway no increase

  No variance shall be granted for any proposed use, development, or activity within any floodway district that will cause any increase in the one-percent chance flood elevation.