In all areas of special flood hazards, 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.
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.
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: 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.
In all areas of special flood hazards where base flood elevation data have been provided as set forth in § 210-7, Basis for establishing the areas of special flood hazard, or in § 210-14B, 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 the 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 the 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 either:
(1)
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
(2)
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; or
(3)
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;
(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 § 210-14C(2)(b).
C.
Manufactured homes.
(1)
Manufactured homes shall be anchored in accordance with § 210-16A(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.
(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 be securely anchored to an adequately anchored
foundation system to resist flotation, collapse, and lateral movement.
Located within areas of special flood hazard established in § 210-7 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.
C.
In all areas of special flood
hazard in which base flood elevation data has been provided and no
floodway has been designated, the accumulative 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 of a foot at any point.
