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 1506 - METHODS FOR EROSION AND SEDIMENT CONTROL DURING TERRAIN ALTERATION ACTIVITIES
Section Env-Wq 1506.08 - Sediment Control Methods: Temporary Catch Basin Inlet Protection

Universal Citation: NH Admin Rules Env-Wq 1506.08

Current through Register No. 13, March 27, 2025

Temporary catch basin inlet protection measures shall comply with the following:

(a) The maximum contributing drainage area to the trap shall be less than one acre;

(b) If hay bales are used, the following requirements also shall be met:

(1) The bale ends shall be tightly adjoined;

(2) Each bale shall be embedded at least 4 inches into the ground; and

(3) A minimum of 2 anchoring stakes per bale shall be used, penetrating at least 18 inches into the ground.

(c) If a gravel and wire mesh filter is used, the following requirements shall be met:

(1) The wire mesh shall be placed over the drop inlet so that the entire opening and a minimum of 12 inches around the opening are covered by the mesh;

(2) The wire mesh shall be hardware cloth or wire with openings up to one half inch;

(3) The gravel filter shall be clean coarse aggregate;

(4) The gravel shall be at least 18 inches on all sides of the drain opening; and

(5) The gravel shall be at least 12 inches in depth.

(d) If a concrete block and gravel drop inlet sediment filter is used, the following requirements shall be met:

(1) The blocks shall be placed lengthwise in a single row around the perimeter of the inlet;

(2) The block ends shall abut one another;

(3) A hardware cloth or wire mesh shall be placed over the openings of the concrete blocks and extend at least 12 inches around the opening to prevent aggregate from being transported through the openings in the blocks;

(4) The gravel filter shall be clean coarse aggregate;

(5) The gravel shall be placed against and along the outside edges of the blocks; and

(6) The gravel filter shall be a minimum of 12 inches high and no more than 24 inches high.

(See Revision Note #1 at chapter heading for Env-Wq 1500) #9343, eff 1-1-09

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