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.
In all areas of special flood hazard where base flood elevation data have been provided as set forth in §
140-7, Basis for establishing areas of special flood hazard, or in §
140-14B, Use of other base flood data, the following standards are required:
A. Residential construction. New construction and substantial improvement
of any residential structure located in an A, AE, AO or AH 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 of the following:
(1) For A or AE Zones:
(a)
Base flood elevation (published FIS/FIRM) plus one foot;
(b)
The best available flood hazard data elevation plus one foot;
(c)
As required by ASCE/SEI 24-14, Table 2-1; or
(d)
As required by N.J.A.C. 7:13-3.
(2) For AO or AH Zones 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)
and require adequate drainage paths around structures on slopes to
guide floodwaters around and away from proposed structures.
(3) Record the method and elevation used above and the Best Available
Flood Hazard Design Data elevation, date and revision in the local
development permit.
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, AE,
AO or AH 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 elevated at or above the more restrictive of the following:
(a)
For A or AE Zones:
[1]
Base flood elevation (published FIS/FIRM) plus one foot;
[2]
The best available flood hazard data elevation plus one foot;
[3]
As required by ASCE/SEI 24-14, Table 2-1; or
[4]
As required by N.J.A.C. 7:13-3.
(b)
For AO or AH Zones 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)
and require adequate drainage paths around structures on slopes to
guide floodwaters around and away from proposed structures;
(c)
Record the method and elevation used above and the Best Available
Flood Hazard Design Data elevation, date and revision in the local
development permit; or
(2) Be floodproofed so that below the more restrictive of the following:
(a)
For A or AE Zones:
[1]
Base flood elevation (published FIS/FIRM) plus one foot;
[2]
The best available flood hazard data elevation plus one foot;
[3]
As required by ASCE/SEI 24-14, Table 6-1; or
[4]
As required by N.J.A.C. 7:13-3.
(b)
AO or AH Zone elevation based upon the highest adjacent grade,
plus the depth number specified in feet, plus one foot (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;
(c)
The structure is watertight with walls substantially impermeable
to the passage of water;
(d)
Have structural components capable of resisting hydrostatic
and hydrodynamic loads and effects of buoyancy;
(e)
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 §
140-14C(2)(b);
(f)
Record the method and elevation used above and the Best Available
Flood Hazard Design Data elevation, date and revision in the local
development permit.
C. Manufactured homes.
(1) Manufactured homes shall be anchored in accordance with §
140-17B.
(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 of the following:
[1]
Base flood elevation (published FIS/FIRM) plus one foot;
[2]
The best available flood hazard data elevation plus one foot;
[3]
As required by ASCE/SEI 24-14, Table 2-1;
[4]
As required by N.J.A.C. 7:13-3.
(e)
AO or AH Zone elevation based upon the highest adjacent grade,
plus the depth number specified in feet, plus one foot (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;
(f)
Record the method and elevation used above and the Best Available
Flood Hazard Design Data elevation, date and revision in the local
development permit.
(3) All recreational vehicles located within an area of special flood
hazard shall either:
(a)
Be on site for fewer than 180 consecutive days;
(b)
Be fully licensed and ready for highway use; or
(c)
Meet the requirements of §§
140-12 and 140-22(1) and (2) above.
Located within areas of special flood hazard established in §
140-7 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 §
140-23A 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, no new
construction, substantial improvements, fill, or other development
shall be permitted, unless it is demonstrated that 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 foot at any point.