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, are required:
A. Anchoring.
(1) All new construction and substantial improvements shall be anchored
to prevent floatation, collapse, or lateral movement of the structure.
(2) All manufactured homes to be placed or substantially improved shall
be anchored to resist floatation, 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. 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 §
99-7, Basis for establishing the areas of special flood hazard, or in § 99-16, 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 base flood elevation
plus one foot or as required by ASCE/SEI 24-14, Table 2-1, whichever
is more restrictive.
(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.
(1) 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:
(a)
Elevated to or above the base flood elevation plus one foot
or as required by ASCE/SEI 24-14, Table 2-1, whichever is more restrictive;
and 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
(b)
Be floodproofed so that below the base flood level plus one foot or as required by ASCE/SEI 24-14, Table 6-1, whichever is more restrictive, the structure is watertight with walls substantially impermeable to the passage of water; have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and 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 §
99-14C(2)(b).
C. Manufactured homes.
(1) Manufactured homes shall be anchored in accordance with §
99-22A.
(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 base flood elevation plus one foot
or as required by ASCE/SEI 24-14, Table 2-1, whichever is more restrictive;
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 be securely anchored
to an adequately anchored foundation system to resist floatation,
collapse, and lateral movement.