New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wq - Water Quality and Quantity Programs
Chapter Env-Wq 1500 - ALTERATION OF TERRAIN
Part Env-Wq 1508 - PERMANENT METHODS FOR PROTECTING WATER QUALITY
Section Env-Wq 1508.19 - Stormwater Control and Conveyance Practices: Stone Berm Level Spreaders
Universal Citation: NH Admin Rules Env-Wq 1508.19
Current through Register No. 26, June 26, 2025
Stone berm level spreaders shall comply with the following:
(a) The level spreader shall discharge to a vegetated receiving area with the capacity to convey the discharge without erosion;
(b) The receiving area shall:
(1) Have a slope of less
than 15 percent; and
(2) Be stable
prior to construction of the level spreader;
(c) The level spreader shall:
(1) Be a 6-inch deep trapezoidal trough;
and
(2) Have a minimum bottom width
of 3 feet;
(d) The level spreader base and top of berm shall be at 0% grade;
(e) The level spreader side slopes and berm side slopes shall be 2:1 or flatter;
(f) The berm shall:
(1) Be at least 18 inches high; and
(2) Have a top width of at least 2 feet;
and
(g) The stone used in the berm shall be graded within the following limits:
(1) 100 percent by weight shall pass the
12-inch sieve;
(2) From 84 to 100
percent by weight shall pass the 6-inch sieve;
(3) From 68 to 83 percent by weight shall
pass the 3-inch sieve;
(4) From 42
to 55 percent by weight shall pass the 1-inch sieve; and
(5) From 8 to 12 percent by weight shall pass
the number 4 sieve;
(See Revision Note #1 at chapter heading for Env-Wq 1500) #9343, eff 1-1-09
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