Section 5.03
Dimensional standards
Servicing
- Geographic extent
- FloodplainFloodplainLand expected to flood at a stated frequency, where building carries extra conditions. Overlay DistrictOverlay districtA second set of rules laid over the base district, adding requirements without replacing it. as shown on FEMA Flood Insurance Rate Map for Loudoun County, dated February 17, 2017
Uses
Permitted by right22
- Agriculture, horticulture, forestry, and fisheries not requiring structures
- Passive and Active Recreation Uses except swimming pools (impervious <=3% of FOD Major Floodplain)
- Stormwater management improvements (rooftop disconnection, sheet flow, grass channel, soil amendments, etc.)
- Utility lines in the floodplain and road crossings
- Public roads shown on Comprehensive Plan or CIP
- Public roads, private roads, and driveways
- Repair, reconstruction, or improvement of existing residences (not substantial improvement)
- Parking areas accessory to permitted or approved Special Exception uses
- Incidental structures not exceeding 840 sq ft
- Temporary storage of material or equipment for construction
- Alterations of floodplain associated with permitted or Special Exception uses
- Restoration and rehabilitation of historic structures
- Road crossings that increase base flood elevation off-site (with CLOMR)
- Public water utility drinking water supply reservoirs
- Maintenance of approved Floodplain Alteration design conditions
- Stream Restoration designed per FSM
- Wetland Mitigation
- Flood mitigation practices per 44 CFR 78.1
- Special Events without land disturbing activity
- Basketball or tennis courts, swimming pools (Minor Floodplain)
- Ponds designed by NRCS, engineer, or surveyor (Minor Floodplain)
- Parking areas less than 5,000 sq ft (Minor Floodplain)
Conditional / special use6
- Marinas, boat rentals, docks, piers, wharves, water ski jump facilities
- Special Events with land disturbing activity
- Riding stables
- Structures required for public utility operation
- Incidental structures greater than 840 sq ft
- Passive and Active Recreation Uses with impervious >3% up to 10% and causing boundary change or increase in BFE
Prohibited2
- Bulk storage of gasoline, chemicals, fuels, or similar substances
- Uses not permitted or Special Exception uses in the FOD
Extracted standards
6 individual requirements pulled out of this section’s prose, each with the sentence it came from.
Floodplain
- Density calculation includes FOD area
For purposes of calculating permitted floor area and number of residential units, land area in any portion of the FOD must be included.
- Openings for enclosed areas below BFE1 sq in per 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 1 square inch for each square foot of enclosed area subject to flooding.
- Lowest floor elevation for residential
New construction or substantial improvement of any residential structure must have the lowest floor, including basement, elevated to or above the base flood elevation (1 foot freeboard recommended).
- Nonresidential elevation or floodproofing
New construction or substantial improvement of any nonresidential building must have the lowest floor elevated to or above the base flood elevation, or be flood-proofed.
- Bottom of openings heightMaximum heightThe tallest a building may be, given in feet, in storeys, or both — whichever binds first.1 ft
The bottom of all required openings must be no higher than 1 foot above the adjacent grade.
- Recreational vehicle standards
Recreational vehicles must be fully licensed, on wheels or jacking system, attached only by quick disconnect utilities, and have no permanently attached additions; if placed for 180 days or longer, deemed manufactured homes.
From the ordinance
The following uses are permitted within the FOD provided such uses conform with Section 5.03. Uses allowed in the underlying district must be prohibited to the extent such uses are not permitted or Special Exception uses in the FOD.