[Amended 8-27-2019 by Ord. No. 2019-11]
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 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 on 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 systems.
(2) New and replacement sanitary 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.
(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. For all new construction and substantial
improvements, 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.
(1) A minimum of two net 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 the 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.
In all areas of special flood hazard where the base flood elevation has been provided as set forth in §
147-8 or in §
147-15B, the following standards are required:
A. Residential construction. 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 (published
FIS/FIRM) plus one foot, the best available flood hazard data elevation
plus one foot, or as required by ASCE/SEI 24-14, Table 2-1; 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) or at
or above the best available flood hazard data elevation plus one foot,
whichever is more restrictive; and require adequate drainage paths
around structures on slopes to guide floodwaters around and away from
proposed structures.
[Amended 8-27-2019 by Ord. No. 2019-11]
B. Nonresidential construction. New construction and
substantial improvement of any commercial, industrial or other nonresidential
structure located in an A or AE Zone shall either have the lowest
floor, including basement, elevated to the level of the base flood
elevation; or together with attendant utility and sanitary facilities
as well as all electrical, heating, ventilating, air-conditioning
and other service equipment, shall:
[Amended 8-27-2019 by Ord. No. 2019-11]
(1) Either:
(a)
Be elevated at or above the more restrictive base flood elevation
plus one foot, the best available flood hazard data 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
FIRM 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) or at or above the best available flood
hazard data elevation plus one foot, whichever is more restrictive;
and require adequate drainage paths around structures on slopes to
guide floodwaters around and away from proposed structures;
(2) Or:
(a)
Be floodproofed so that below the more restrictive, base flood
elevation (published FIS/FIRM) plus one foot, the best available flood
hazard data 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;
(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 certifications shall be provided to the official
as set forth in § 147-14C(2).
C. Manufactured homes.
(1) Manufactured homes shall be anchored in accordance with §
147-17A(2).
(2) All manufactured homes to be placed or substantially improved within
an area of special flood hazard shall:
[Amended 8-27-2019 by Ord. No. 2019-11]
(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
(published FIS/FIRM) plus one foot, the best available flood hazard
data 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 be securely anchored
to an adequately anchored foundation system to resist flotation, collapse,
and lateral movement.
Located within the areas of special flood hazard established in §
147-8 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. Encroachments, including fill, new construction, substantial
improvements and other development, shall be prohibited unless a technical
evaluation demonstrates that encroachment shall not result in any
increases in flood levels during the occurrence of the base flood
discharge.
B. If Section 5.4(1) is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of this 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 of a foot
at any point.