Section Env-Wq 1508.19 - Stormwater Control and Conveyance Practices: Stone Berm Level Spreaders 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;N.H. Admin. Code § Env-Wq 1508.19
(See Revision Note #1 at chapter heading for Env-Wq 1500) #9343, eff 1-1-09
Amended by Volume XXXVII Number 32, Filed August 10, 2017, Proposed by #12342, Effective 8/15/2017, Expires 8/15/2027.Amended by Number 41, Filed October 12, 2023, Proposed by #13758, Effective 9/28/2023, Expires 9/28/2033 (formerly Env-Wq 1508.18) (see Revision Note #4 at chapter heading for Env-Wq 1500).