New Jersey Administrative Code › Title 7 - ENVIRONMENTAL PROTECTION › Chapter 13 - FLOOD HAZARD AREA CONTROL ACT RULES › Subchapter 9 - GENERAL PERMITS › Section 7:13-9.10 - General permit 10 - reconstruction of a bridge or culvert across a regulated water with a drainage area of 50 acres or more

Current through Register Vol. 56, No. 14, July 15, 2024
(a) General permit 10 authorizes the
				reconstruction of one existing bridge or culvert that crosses a regulated water
				that has a drainage area of 50 acres or more, provided the conditions at
				N.J.A.C.
				7:13-6.7 are met and:
1. The applicant provides an engineering
				certification confirming that the proposed bridge or culvert is designed to not
				increase the frequency or depth of offsite flooding during any flood event
				described in
7:13-12.1(i)
;
2. In order to ensure
				that the hydraulic capacity of the reconstructed bridge or culvert is
				substantially equivalent to the hydraulic capacity of the existing bridge or
				culvert, all the following are met:
i. The
				cross-sectional area of the new structure is at least equal to, and not more
				than five percent greater than, the cross-sectional area of the existing
				structure;
ii. The width-to-height
				ratio of the new structure does not deviate by more than 10 percent from the
				width-to-height ratio of the existing structure;
iii. The length of the new structure does not
				deviate by more than 10 feet from the length of the existing structure or more
				than 10 percent of the length of the existing structure, whichever is
				greater;
iv. The orientation of any
				new abutments and headwalls is aligned as closely as feasible to the
				orientation of the existing abutments and headwalls; and
v. The elevation of the crown of the roadway
				profile above the bridge or culvert is not altered within the flood hazard
				area;
3. The bridge or
				culvert is designed to remain stable, scour resistant, and resistant to
				displacement and/or damage. At a minimum, each bridge shall have stable
				abutments, each culvert shall have stable headwalls, and each abutment and
				headwall shall have footings that extend no less than three feet below the
				invert of the channel;
4. The
				bridge or culvert is designed to avoid any adverse impacts to aquatic,
				semi-aquatic, and terrestrial resources. Where possible, a stable, natural,
				earthen channel with low-flow aquatic passage shall be preserved and/or
				provided within the bridge or culvert as well as any section of channel
				disturbed to accommodate its construction;
5. No armoring is placed under or across the
				channel bed, unless such armoring is necessary to prevent scour along the
				proposed abutments or footings. In such a case, the armoring shall be buried
				beneath at least two feet of native substrate, where feasible;
6. Any temporarily disturbed sections of the
				channel are restored to pre-construction conditions immediately after
				completion of the disturbance. Characteristics that shall be replicated include
				channel shape, width, and meandering, ratio of shallow areas to deep areas,
				anticipated flow rate, and velocity and substrate type;
7. No riparian zone vegetation is cleared,
				cut, and/or removed, except for vegetation within 20 feet of the bridge or
				culvert, where such disturbance is necessary to facilitate its reconstruction;
				and
8. The timing restrictions set
				forth at N.J.A.C. 7:13-11.5(d)
				 are observed.