New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wt - Wetlands Programs
Chapter Env-Wt 900 - STREAM CROSSINGS; CERTIFIED CULVERT MAINTAINER PROGRAM
Part Env-Wt 904 - DESIGN AND CONSTRUCTION OF STREAM CROSSINGS
Section Env-Wt 904.01 - General Design Considerations
Universal Citation: NH Admin Rules Env-Wt 904.01
Current through Register No. 13, March 27, 2025
(a) All stream crossings, whether over tidal or non-tidal waters, shall be designed and constructed so as to:
(1) Not be a barrier to
sediment transport;
(2) Not
restrict high flows and maintain existing low flows;
(3) Not obstruct or otherwise substantially
disrupt the movement of aquatic organisms indigenous to the waterbody beyond
the actual duration of construction;
(4) Not cause an increase in the frequency of
flooding or overtopping of banks;
(5) Maintain or enhance geomorphic
compatibility by:
a. Minimizing the potential
for inlet obstruction by sediment, wood, or debris; and
b. Preserving the natural alignment of the
stream channel;
(6)
Preserve watercourse connectivity where it currently exists;
(7) Restore watercourse connectivity where:
a. Connectivity previously was disrupted as a
result of human activity(ies); and
b. Restoration of connectivity will benefit
aquatic organisms upstream or downstream of the crossing, or both;
(8) Not cause erosion,
aggradation, or scouring upstream or downstream of the crossing; and
(9) Not cause water quality
degradation.
(b) For stream crossings over tidal waters, the stream crossing shall be designed to:
(1) Match the velocity, depth,
cross-sectional area, and substrate of the natural stream; and
(2) Be of sufficient size to not restrict
bi-directional tidal flow over the natural tide range above, below, and through
the crossing.
#9714, eff 5-12-10
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