In all areas of 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 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) 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 contain at least 50 lots
or five acres (whichever is less).
E. 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: 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.
The bottom of all openings shall be no higher than one foot above
grade. Openings may be equipped with screens, louvers, or other covering
or devices, provided that they permit the automatic entry and exit
of floodwaters.
[Amended 6-12-2019 by Ord. No. 997-2019]
[Amended 6-12-2019 by Ord. No. 997-2019]
In all areas of special flood hazards where base flood elevation data have been provided as set forth in §
105-7, Basis for establishing areas of special flood hazard or in §
105-14B, Use of other base flood 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 more restrictive
base flood elevation plus one foot or as required by ASCE/SEI 24-14,
Table 2-1;
(2) Require within any AO or AH Zone on the municipality's DFIRM
that all new construction and substantial improvement of any residential
structure shall have the lowest floor, including basement, together
with the attendant utilities and sanitary facilities, elevated above
the depth number specified in feet plus one foot above the highest
adjacent grade (at least three 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. 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 shall 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:
(1) Either:
(a)
Elevated at or above the more restrictive base flood elevation
plus one foot or as required by ASCE/SEI 24-14, Table 2-1; and
(b)
Require within any AO or AH Zone on the municipality's
DFIRM to elevate above the depth number specified in feet plus one
foot above the highest adjacent grade (at least three 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;
(2) Or, be floodproofed so that below the more restrictive base flood
elevation plus one foot or as required by ASCE/SEI 24-14, Table 6-1,
the structure is watertight with walls substantially impermeable to
the passage of water.
C. Manufactured homes.
(1) Manufactured homes shall be anchored in accordance with §
105-16A(2).
(2) All manufactured homes to be placed or substantially improved within
an area of special flood hazard shall:
(a)
Be consistent with the need to minimize flood damage;
(b)
Be constructed to minimize flood damage;
(c)
Have adequate drainage provided to reduce exposure to flood
damage;
(d)
Be elevated on a permanent foundation such that the top of the
lowest floor is at or above the more restrictive base flood elevation
plus one foot or as required by ASCE/SEI 24-14, Table 2-1; and
(e)
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 securely anchored
to an adequately anchored foundation system to resist floatation,
collapse, and lateral movement.
Located within areas of special flood hazard established in §
105-7 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles, and erosion potential, the following provisions apply:
A. Prohibit encroachments, including fill, new construction, substantial
improvements, and other development unless a technical evaluation
demonstrates that encroachment shall not result in any increase in
flood levels during the occurrence of the base flood discharge.
B. If §
105-18A is satisfied, all new construction and substantial improvements must comply with Article
V, Provisions for Flood Hazard Reduction.
C. In all areas of special flood hazard in which base flood elevation
data has been provided and no floodway has been designated, the cumulative
effect of any proposed development, when combined with all other existing
and anticipated development, shall not increase the water surface
elevation of the base flood more than 0.2 foot at any point.
Coastal-high hazard areas (V or VE Zones) are located within the areas of special flood hazard established in §
105-7. 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), the best available
flood hazard data elevation or as required by the Uniform Construction
Code (NJAC 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 §
105-19B(4).
(2) Structural support.
(a)
All new construction and substantial improvements shall be securely
anchored on piling 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 (one-hundred-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 §
105-19B(1) and
(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 are 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 they
are 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 Construction Code Official or Building Subcode Official
for approval.
C. Sand dunes. Prohibit man-made alteration of sand dunes within Zones
VE and V on the community's DFIRM which would increase potential flood
damage.