In all areas of moderate and special flood hazard, compliance
with the applicable requirements of the Uniform Construction Code
(N.J.A.C. 5:23) and the following standards, whichever is more restrictive,
is 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 to be placed or substantially improved 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 and methods.
(1) All new construction, substantial improvements, and lateral additions
shall be constructed with materials and utility equipment resistant
to flood damage.
(2) All new construction, substantial improvements, and lateral additions
shall be constructed using methods and practices that minimize flood
damage.
(3) The use of fill to elevate buildings shall be prohibited.
(4) All new construction, substantial improvements and lateral additions
shall be constructed on foundations designed and scaled by a registered
design professional and comply with the requirements of the International
Building Code, the International Residential Code or ASCE 24.
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) For all new construction and substantial improvements, the 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 and other proposed new development shall
be consistent with the need to minimize flood damage;
(2) All subdivision proposals and other proposed new development 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 and other proposed new development 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 new development which contains 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 in at least two exterior walls of each
enclosed area, 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 coverings
or devices, provided that they permit the automatic entry and exit
of floodwaters.
F. Outdoor storage. The outdoor storage of all materials is prohibited.
In all areas of moderate and special flood hazard where base flood elevation data have been provided as set forth in §
126-7, Basis for establishing areas of special flood hazard, or in §
126-14B, 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
located in an A or AE Zone shall have the lowest floor, including
basement, together with the attendant utilities (including all electrical,
heating, ventilating, air-conditioning and other service equipment)
and sanitary facilities, elevated at or above the base flood elevation
(published FIS/FIRM), the best available flood hazard data elevation,
or as required by ASCE/SEI 24-14, Table 2-1, whichever is more restrictive,
plus three feet.
(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 three feet above the depth number specified
in feet (at least three feet if no depth number is specified) or at
or above the best available flood hazard data elevation plus two feet,
whichever is more restrictive, and require adequate drainage paths
around structures on slopes to guide floodwaters around and away from
proposed structures.
(3) Require within any X 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 at or above the base flood elevation from the best available data, plus three feet. The base flood elevation shall be determined in accordance with §
126-14B.
[Added 3-26-2020 by Ord. No. 2020-05]
B. Nonresidential construction. In an area of special flood hazard,
all new construction and substantial improvement of any commercial,
industrial or other nonresidential structure located in an A or AE
Zone or X Zone shall either have the lowest floor, including basement,
together with the attendant utilities and sanitary facilities as well
as all electrical, heating, ventilating, air-conditioning and other
service equipment:
[Amended 3-26-2020 by Ord. No. 2020-05]
(1) Elevated to or above the base flood elevation (published FIS/FIRM),
the best available flood hazard data elevation, or as required by
ASCE/SEI 24-14, Table 2-1, whichever is more restrictive, plus three
feet; and
(2) Require within any AO Zone on the municipality's effective FIRM that
all new construction and substantial improvement of any commercial,
industrial or other nonresidential structure shall have the lowest
floor, including basement, elevated above the highest adjacent grade
three feet above the depth number specified in feet or at or above
the best available flood hazard data elevation plus two feet, whichever
is more restrictive, and require adequate drainage paths around structures
on slopes to guide floodwaters around and away from proposed structures;
or
(3) Be floodproofed so that below the base flood level plus three feet, the best available flood hazard data elevation plus three feet, or as required by ASCE/SEI 24-14, Table 6-1 (whichever is more restrictive), or pursuant to §
126-14B for structures in the X Zone, the structure is watertight with walls substantially impermeable to the passage of water;
(4) Have structural components capable of resisting hydrostatic and hydrodynamic
loads and effects of buoyancy; and
(5) 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 §
126-14.
C. Manufactured homes.
(1) Manufactured homes shall be anchored in accordance with §
126-16A(2).
(2) All manufactured homes to be placed or substantially improved within
an area of special flood hazard shall be consistent with the need
to minimize flood damage, be constructed to minimize flood damage,
have adequate drainage provided to reduce exposure to flood damage,
be elevated on a permanent foundation such that the top of the lowest
floor is at or above the base flood elevation (published FIS/FIRM),
the best available flood hazard data elevation, or as required by
ASCE/SEI 24-14, Table 2-1, plus three feet (whichever is more restrictive).
(3) The manufactured home chassis is supported by reinforced piers or
other foundation elements of at least equivalent strength that are
no less than 36 inches in height above grade and be securely anchored
to an adequately anchored foundation system to resist flotation, collapse,
and lateral movement.
Coastal high-hazard areas (V or VE Zones) are located within the areas of special flood hazard established in §
126-7. These areas have special flood hazards associated with high-velocity waters from tidal surges and hurricane wave wash; therefore, the following provisions shall apply:
A. Location of structures.
(1) All buildings or structures shall be located landward of the reach
of the mean high tide.
(2) The placement of manufactured homes shall be prohibited, except in
an existing manufactured home park or subdivision.
B. Construction methods.
(1) Elevation. All new construction and substantial improvements shall
be elevated on piling or columns so that:
(a)
The bottom of the lowest horizontal structural member of the
lowest floor (excluding the piling or columns) is elevated to or above
the base flood elevation (published FIS/FIRM) plus three feet, the
best available flood hazard data elevation plus one foot, as required
by ASCE/SEI 24-14, Table 4-1, or as required by the Uniform Construction
Code (N.J.A.C. 5:23), whichever is more restrictive; and
(b)
With all space below the lowest floor's supporting member open so as not to impede the flow of water, except for breakaway walls as provided or in §
126-19B(4).
(2) Structural support.
(a)
All new construction and substantial improvements shall be securely
anchored on pilings or columns.
(b)
The pile or column foundation and structure attached thereto
shall be anchored to resist flotation, collapse or lateral movement
due to the effects of wind and water loading values, each of which
shall have a one-percent chance of being equaled or exceeded in any
given year (100-year mean recurrence interval).
(c)
There shall be no fill used for structural support.
(3) Certification. A registered professional engineer or architect shall develop or review the structural design specifications and plans for the construction and shall certify that the design and methods of construction to be used are in accordance with accepted standards of practice for compliance with the provisions of §
126-19A and
B(2)(a) and
(b).
(4) Space below the lowest floor.
(a)
Any alteration, repair, reconstruction or improvement to a structure
started after the enactment of this chapter shall not enclose the
space below the lowest floor unless breakaway walls, open wood lattice-work
or insect screening is used as provided for in this section.
(b)
Breakaway walls, open wood lattice-work or insect screening
shall be allowed below the base flood elevation, provided that it
is intended to collapse under wind and water loads without causing
collapse, displacement or other structural damage to the elevated
portion of the building or supporting foundation system. Breakaway
walls shall be designed for a safe loading resistance of not less
than 10 and no more than 20 pounds per square foot. Use of breakaway
walls which exceed a design-safe loading of 20 pounds per square foot
(either by design or when so required by local or state codes) may
be permitted only if a registered professional engineer or architect
certifies that the designs proposed meet the following conditions:
[1]
Breakaway wall collapse shall result from a water load less
than that which would occur during the base flood; and
[2]
The elevated portion of the building and supporting foundation
system shall not be subject to collapse, displacement or other structural
damage due to the effects of wind and water load acting simultaneously
on all building components (structural and nonstructural). Water-loading
values used shall be those associated with the base flood. Wind-loading
values used shall be those required by applicable state or local building
standards.
(c)
If breakaway walls are utilized, such enclosed space shall be
used solely for parking of vehicles, building access, or storage and
not for human habitation.
(d)
Prior to construction, plans for any breakaway wall must be
submitted to the Certified Floodplain Manager for approval.
C. Sand dunes. Man-made alteration of sand dunes is prohibited within
Zones VE and V on the community's effective FIRM which would increase
potential flood damage.