N.H. Code Admin. R. Env-Wq 1506.07

Current through Register No. 25, June 20, 2024

Section Env-Wq 1506.07 - Sediment Control Methods: Temporary Check Dams

Temporary check dams shall comply with the following:

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

(b) The maximum height of the dam shall be 2 feet;

(c) The center of the dam shall be at least 6 inches lower than the outer edges;

(d) The maximum spacing between the dams shall be such that the toe of the upstream dam is at the same elevation as the overflow elevation of the downstream dam;

(e) The dam shall not be used in a flowing stream;

(f) The dams shall be checked after each rainfall and at least daily during prolonged rainfall and necessary repairs shall be made immediately;

(g) Hay bale check dams shall be embedded into the ground at least 4 inches but no more than 6 inches;

(h) Stone check dams shall be constructed of a well-graded angular 2-inch to 3-inch stone; and

(i) Timber check dams shall be constructed of 4-inch to 6-inch logs and embedded at least 18 inches deep into the soil.

N.H. Code Admin. R. Env-Wq 1506.07

(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.