In all areas of special flood hazard, the following
standards are required:
A. Anchoring.
(1) All new construction and substantial improvements
shall be anchored to prevent flotation, collapse or lateral movement
of the structure.
(2) All manufactured homes shall be anchored to resist
flotation, collapse or lateral movement. Methods of anchoring may
include, but are not to be limited to, use of over-the top or frame
ties to ground anchors. This requirement is in addition to applicable
state and local anchoring requirements for resisting wind forces.
B. Construction materials, equipment and methods.
(1) All new construction and substantial improvements
shall be constructed with materials and utility equipment resistant
to flood damage.
(2) All new construction and substantial improvements
shall be constructed using methods and practices that minimize flood
damage.
C. Utilities.
(1) All new and replacement water supply systems shall
be designed to minimize or eliminate infiltration of floodwaters into
the system;
(2) New and replacement sanitary sewage systems shall
be designed to minimize or eliminate infiltration of floodwaters into
the systems and discharge from the systems into floodwaters;
(3) On-site waste disposal systems shall be located to
avoid impairment to them or contamination from them during flooding;
and
(4) Electrical, heating, ventilation, plumbing and air-conditioning
equipment and other service facilities shall be designed and/or located
so as to prevent water from entering or accumulating within the components
during conditions of flooding.
D. Subdivision proposals.
(1) All subdivision proposals shall be consistent with
the need to minimize flood damage;
(2) All subdivision proposals shall have public utilities
and facilities such as sewer, gas, electrical and water systems located
and constructed to minimize flood damage;
(3) All subdivision proposals shall have adequate drainage
provided to reduce exposure to flood damage; and
(4) Base flood elevation data shall be provided for subdivision
proposals and other proposed development which contain at least 50
lots or five acres (whichever is less).
E. Enclosure openings. All new construction and substantial
improvements having fully enclosed areas below the lowest floor that
are usable solely for parking of vehicles, building access or storage
in an area other than a basement and which are subject to flooding
shall be designed to automatically equalize hydrostatic flood forces
on exterior walls by allowing for the entry and exit of floodwaters.
Designs for meeting this requirement must either be certified by a
registered professional engineer or architect or must meet or exceed
the following minimum criteria:
(1) A minimum of two openings having a total net area
of not less than one square inch for every square foot of enclosed
area subject to flooding shall be provided.
(2) The bottom of all openings shall be no higher than
one foot above grade.
(3) Openings may be equipped with screens, louvers or
other covering or devices, provided that they permit the automatic
entry and exit of floodwaters.
In all areas of special flood hazard where base flood elevation data have been provided as set forth in §
110-7, Basis for establishing areas of special flood hazard, or in §
110-14B, Use of other base flood and floodway data, the following standards are required:
A. Residential construction.
(1) New construction and substantial improvement of any
residential structure shall have the lowest floor, including basement,
elevated to or above base flood elevation;
(2) Require within any AO Zone on the municipality's FIRM
that all new construction and substantial improvement of any residential
structure shall have the lowest floor, including basement, elevated
above the highest adjacent grade at least as high as the depth number
specified in feet (at least two feet if no depth number is specified);
and require adequate drainage paths around structures on slopes to
guide floodwaters around and away from proposed structures.
B. Nonresidential construction.
(1) New construction and substantial improvement of any
commercial, industrial or other nonresidential structure shall either
have the lowest floor, including basement, elevated to the level of
the base flood elevation; or
(2) Require within any AO Zone on the municipality's FIRM
that all new construction and substantial improvement of any commercial,
industrial or other nonresidential structure shall either have the
lowest floor, including basement, elevated above the highest adjacent
grade at least as high as the depth number specified in feet (at least
two feet if no depth number is specified); and require adequate drainage
paths around structures on slopes to guide floodwaters around and
away from proposed structures; or, together with the attendant utilities
and sanitary facilities, shall:
(a)
Be floodproofed so that below the base flood
level the structure is watertight with walls substantially impermeable
to the passage of water;
(b)
Have structural components capable of resisting
hydrostatic and hydrodynamic loads and effects of buoyancy; and
(c)
Be certified by a registered professional engineer or architect that the design and methods of construction are in accordance with accepted standards of practice for meeting the applicable provisions of this subsection. Such certification shall be provided to the official as set forth in §
110-14C(2).
C. Manufactured homes.
(1) Manufactured homes shall be anchored in accordance with §
110-16A(2).
(2) All manufactured homes to be placed or substantially
improved within an area of special flood hazard shall be elevated
on a permanent foundation such that the top of the lowest floor is
at or above the base flood elevation.