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 903 - STREAM CROSSINGS: CLASSIFICATIONS AND APPLICATIONS
Section Env-Wt 903.03 - Information Required for a Stream Crossing SPN, LSA, or EXP

Universal Citation: NH Admin Rules Env-Wt 903.03

Current through Register No. 13, March 27, 2025

In addition to the information required in Env-Wt 300, the applicant shall submit the following for any stream crossing project that is subject to an SPN, LSA, or EXP:

(a) A USGS map or updated elevation data based on LiDAR on which the following are clearly delineated or otherwise noted:

(1) The approximate boundaries of the contributing watershed;

(2) The size of the contributing watershed; and

(3) Identification of the stream tier based on watershed size;

(b) Plans that show the following:

(1) The scale of the plan and a north arrow;

(2) The extent of disturbance;

(3) Road locations, including road edges, centerline, and boundaries of the right-of-way;

(4) Proposed channel work including bank erosion control features, grade control, and channel linings; and

(5) All dimensions of the proposed structure and of the existing structure, if any, including inlet and outlet invert elevations;

(c) The hydraulic capacity of the proposed crossing, in terms of flood frequency event, and of the existing crossing, if any;

(d) The type of crossing, such as a culvert or span, that is proposed and that exists, if any;

(e) The following information about the dewatering system proposed to be used:

(1) Estimated maximum flow anticipated during construction;

(2) The location, height, and width of the diversion dam;

(3) The location and capacity of each sump; and

(4) Backwater prevention method; and

(f) The following information about erosion and pollution controls:

(1) The sediment treatment plan, including methods, release point(s), and extent;

(2) Any additional methods proposed to control erosion; and

(3) All methods of preventing and controlling releases from pumps, fuel stations, and equipment storage.

#9714, eff 5-12-10

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