In addition to the general requirements of Article IV, the requirements of this section apply to all development proposed in special flood hazard areas other than coastal high hazard areas and Coastal A Zones.
A.
Elevation requirements.
(1)
The lowest floor (including basement) shall be elevated at least
to the level of the base flood elevation plus 12 inches of freeboard.
[Amended 12-7-2018]
(2)
In areas of shallow flooding (Zone AO), the lowest floor (including
basement) shall be elevated at least as high above the highest adjacent
grade as the depth number specified in feet on the Flood Insurance
Rate Map plus 12 inches of freeboard or at least two feet plus 12
inches of freeboard if a depth number is not specified; adequate drainage
paths shall be provided to guide floodwaters around and away from
the structure.
[Amended 12-7-2018]
B.
Enclosures below the lowest floor.
(1)
Enclosures below the lowest floor shall be used solely for parking
of vehicles, building access, crawlspaces, or limited storage.
(2)
Enclosures below the lowest floor shall be constructed using flood
damage-resistant materials. See FEMA Technical Bulletin No. 2, Flood
Damage-Resistant Materials Requirements.
(3)
Enclosures below the lowest floor (including crawlspaces) shall be
provided with flood openings which shall meet the following criteria
(see FEMA Technical Bulletin No. 1, Openings in Foundation Walls and
Walls of Enclosures):
(a)
There shall be a minimum of two openings on different sides
of each enclosed area; if a building has more than one enclosed area
below the base flood elevation, each area shall have openings on exterior
walls.
(b)
The total net area of all openings shall be at least one square
inch for each square foot of enclosed area, or the openings shall
be designed and certified by a registered engineer or architect to
provide for equalization of hydrostatic flood forces on exterior walls
by allowing for the automatic entry and exit of floodwaters.
(c)
The bottom of each opening shall be one foot or less above the
adjacent ground level.
(d)
Any louvers, screens or other opening covers shall allow the
automatic flow of floodwaters into and out of the enclosed area.
(e)
Where installed in doors and windows, openings that meet the requirements of § 88-26B(3)(a) through (d) are acceptable; however, doors and windows without installed openings do not meet the requirements of this section.
(4)
Crawlspaces shall have the finished interior ground level equal to
or higher than the outside finished ground level on at least one entire
side of the foundation wall.
A.
Elevation requirements.
(1)
The lowest floor (including basement) shall be elevated at least to the level of the base flood elevation plus 12 inches of freeboard or the structure shall be dry floodproofed in accordance with § 88-27B.
[Amended 12-7-2018]
(2)
In areas of shallow flooding (Zone AO), if not dry floodproofed,
the lowest floor (including basement) shall be elevated at least as
high above the highest adjacent grade as the depth number specified
in feet on the Flood Insurance Rate Map plus 12 inches of freeboard,
or at least two feet plus 12 inches of freeboard if a depth number
is not specified; adequate drainage paths shall be provided to guide
floodwaters around and away from the structure.
[Amended 12-7-2018]
B.
Dry floodproofing requirements. Dry floodproofed structures, together
with attendant and utility and sanitary facilities, shall:
(1)
Be designed to be dry floodproofed such that the structure is watertight
with walls and floors substantially impermeable to the passage of
water to the level of the base flood elevation plus 12 inches of freeboard.
In areas of shallow flooding (Zone AO), the structure shall be dry
floodproofed at least as high above the highest adjacent grade as
the depth number specified in feet on the Flood Insurance Rate plus
12 inches of freeboard, or at least two feet plus 12 inches of freeboard
if a depth number is not specified.
[Amended 12-7-2018]
(2)
Have structural components capable of resisting hydrostatic and hydrodynamic
loads and effects of buoyancy.
(3)
Be certified by a licensed professional engineer or licensed professional
architect with a floodproofing certificate, that the design and methods
of construction meet the requirements of this section. Refer to FEMA
Technical Bulletin No. 3, Nonresidential Floodproofing - Requirements
and Certification, for guidance.
A.
Accessory structures shall meet the requirements of these regulations.
Accessory structures that have a footprint of no more than 200 square
feet may be allowed without requiring elevation or floodproofing,
provided that such structures meet all of the following requirements:
(1)
Usable only for parking or limited storage;
(2)
Constructed with flood damage-resistant materials below the base
flood elevation;
(3)
Constructed and placed to offer the minimum resistance to the flow
of floodwaters;
(4)
Firmly anchored to prevent flotation, collapse, and lateral movement;
(5)
Electrical service and mechanical equipment elevated at least to
the level of the base flood elevation plus 12 inches of freeboard;
and
[Amended 12-7-2018]
B.
For guidance, see FEMA Technical Bulletin No. 7, Wet Floodproofing
Requirements.
