Dimensional standards
Servicing
- Applies near
- Flood Insurance Rate Map (FIRM)
- Geographic extent
- Special Flood Hazard Areas as shown on the Flood Insurance Rate Map (FIRM) for the City
Extracted standards
19 individual requirements pulled out of this section’s prose, each with the sentence it came from.
Floodplain
- A zone base flood elevation determination
Where the specific one (1) percent annual chance flood elevation cannot be determined, the applicant shall determine this base flood elevation using technical methods that correctly reflect currently accepted practices.
- AE zone without floodway - no increase in flood elevation
No new construction, substantial improvements, or other development shall be permitted unless it is demonstrated that the cumulative effect will not increase the water surface elevation of the base flood more than one (1) foot.
- Anchoring requirements
New construction and substantial improvements shall be anchored to prevent flotation, collapse or lateral movement of the structure.
- AO zone non-residential elevation
All new construction and substantial improvements of non-residential structures shall have the lowest floor elevated to two (2) feet above the flood depth specified on the FIRM, or be completely flood-proofed to that level.
- AO zone residential elevation
All new construction and substantial improvements of residential structures shall have the lowest floor, including basement, elevated to two (2) feet above the flood depth specified on the FIRM. If no flood depth number is specified, the lowest floor shall be elevated no less than four (4) feet above the highest adjacent grade.
- Flood carrying capacity
The flood carrying capacity within an altered or relocated portion of any watercourse shall be maintained.
- Flood-resistant materials
New construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage.
- Permitted uses in floodway
Agricultural operations, public and private recreational uses, botanical gardens, and accessory residential uses such as yard areas, gardens, and play areas.
- Special exception uses in floodway
Accessory structures, utilities distribution, sewage treatment facility, quarry and mining operations, storage of materials and equipment, placement of recreational vehicles, and change of nonconforming use.
- Freeboard above base flood elevation2 ft
lowest floor elevated to or above the base flood level plus twenty-four (24) inches of freeboard
- Lowest floor elevation requirement
New construction or substantial improvement of any residential structure 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 (24) inches of freeboard.
Manufactured homes shall be anchored to prevent flotation, collapse, or lateral movement. Methods of anchoring may include over-the-top or frame ties to ground anchors.
- On-site waste disposal systems
On-site waste disposal systems shall be located and constructed to avoid impairment to them or contamination from them during flooding.
- Recreational vehicle requirements
All recreational vehicles placed on sites must either be on the site for fewer than 180 consecutive days and be fully licensed and ready for highway use, or meet all the requirements for manufactured homes.
- 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.
- Openings for enclosed areas below lowest floor
Provide a minimum of two (2) 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. The bottom of all required openings shall be no higher than one (1) foot above the adjacent grade.
- Utility equipment elevation
All electrical, heating, ventilation, plumbing, air conditioning equipment, and other service facilities, including ductwork, shall be elevated or floodproofed to two (2) feet above the base flood elevation.
- Water supply systems
New and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system.
- Watercourse alteration permits
Prior to any proposed alteration or relocation of any channels or of any watercourse, a permit shall be obtained from the U.S. Corps of Engineers, the Virginia Department of Environmental Quality, and the Virginia Marine Resources Commission.
From the ordinance
The various special flood hazard districts shall include the SFHAs. The basis for the delineation of these districts shall be the FIS and the FIRM for the City prepared by FEMA...