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.Â
Anchoring.
(1)Â
All
new construction and substantial improvements shall be anchored to
prevent flotation, collapse, or lateral movement of the structure.
(2)Â
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.Â
Construction
materials and methods.
C.Â
Utilities.
(1)Â
All
new and replacement water supply systems shall be designed to minimize
or eliminate infiltration of floodwaters into the system;
(2)Â
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)Â
On-site
waste disposal systems shall be located to avoid impairment to them
or contamination from them during flooding; and
(4)Â
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.Â
Subdivision
proposals.
(1)Â
All
subdivision proposals and other proposed new development shall be
consistent with the need to minimize flood damage;
(2)Â
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)Â
All
subdivision proposals and other proposed new development shall have
adequate drainage provided to reduce exposure to flood damage; and
(4)Â
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.Â
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 § 22-7, Basis for establishing areas of special flood hazard, or in § 22-14B, Use of other base flood and floodway data, the following standards are required:
A.Â
Residential
construction.
(1)Â
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)Â
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.Â
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)Â
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
(2)Â
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)Â
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;
(4)Â
Have
structural components capable of resisting hydrostatic and hydrodynamic
loads and effects of buoyancy; and
(5)Â
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 § 22-14C(2)(b).
C.Â
Manufactured
homes.
(2)Â
All
manufactured homes to be placed or substantially improved within an
area of special flood hazard shall:
(a)Â
Be consistent with the need to minimize flood damage;
(b)Â
Be constructed to minimize flood damage;
(c)Â
Have adequate drainage provided to reduce exposure to flood damage;
(d)Â
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)Â
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 § 22-7 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.Â
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.Â
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 2/10 of a foot at any point.