N.J. Admin. Code § 19:4-9.20

Current through Register Vol. 56, No. 12, June 17, 2024

Section 19:4-9.20 - Buildings

(a) Residential construction:

1. New construction and substantial improvement of any residential structure located in an A or AE zone on the District's DFIRM 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 (published FIS/FIRM) plus one foot, the best available flood hazard data elevation plus one foot, or as required by the American Society of Civil Engineers (ASCE)/SEI 24-14, Flood Resistant Design and Construction, Table 2-1, incorporated herein by reference, as amended and supplemented, whichever is more restrictive. A copy of ASCE/SEI 24-14 may be obtained from ASCE, 1801 Alexander Bell Drive, Reston, VA 20191 or online at www.asce.org.

2. New construction and substantial improvement of any residential structure located in an AO or AH zone on the District's DFIRM 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 one foot above the depth number specified in feet, above the highest adjacent grade (at least three feet if no depth number is specified).

3. Adequate drainage paths shall be provided around structures on slopes to guide floodwaters around and away from proposed structures.

(b) Non-residential construction:

1. New construction and substantial improvement of any commercial, industrial, or other non-residential structure located in an area of special flood hazard 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 equipment, as follows:

i. When located within an A or AE zone on the District's DFIRM, elevated at or above the 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, Flood Resistant Design and Construction, Table 2-1, whichever is more restrictive;

ii. When located within an AO or AH zone on the District's DFIRM, 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

iii. Adequate drainage paths shall be provided around structures on slopes to guide floodwaters around and away from proposed structures;

2. Non-residential construction deemed to be a non-substantial improvement of any commercial, industrial, or other non-residential structure located in an area of special flood hazard, together with the attendant utilities and sanitary facilities, as well as all electrical, heating, ventilating, air conditioning, and other equipment, may:

i. Be floodproofed, so that below the elevation equal to the 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, whichever is more restrictive, the structure is water tight with walls substantially impermeable to the passage of water;

ii. Have structural components capable of resisting hydrostatic and hydrodynamic loads and the effect of buoyancy; and

iii. Be certified by a licensed 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 Chief Engineer.

(c) Manufactured homes shall be anchored in accordance with 19:4-9.2 3.

(d) All manufactured homes to be placed or substantially improved within an area of special flood hazard shall:

1. Be consistent with the need to minimize flood damage;

2. Be constructed to minimize flood damage;

3. Have adequate drainage provided to reduce exposure to flood damage; and

4. Be elevated on a permanent foundation, such that the top of the lowest floor is elevated to a minimum of one foot above the base flood elevation (published FIS/FIRM), the best available flood hazard data elevation plus one foot, or as required by ASCE/SEI 24-14, Table 2-1, whichever is more restrictive; and

5. The manufactured home chassis shall be 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 shall be securely anchored to an adequately anchored foundation system to resist flotation, collapse, and lateral movement.

N.J. Admin. Code § 19:4-9.20

Amended by 51 N.J.R. 1368(a), effective 8/19/2019