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 1506.11 - Sediment Control Methods: Construction Dewatering

(a) The discharge shall be stopped immediately if the receiving area shows any sign of instability or erosion;

(b) All channels, swales, and ditches dug for discharging water from the excavated area shall be stable prior to directing discharge to them;

(c) If a construction equipment bucket is used, it shall empty the material to a stable area;

(d) No dewatering shall occur during periods of intense, heavy rain;

(e) Flow to the sediment removal structure shall not exceed the structure's capacity to settle and filter flow or its volume capacity; and

(f) Wherever possible, the discharge from the sediment removal structure shall drain to a well-vegetated buffer by sheet flow while maximizing the distance to the nearest water resource and minimizing the slope of the buffer area.