N.H. Code Admin. R. Env-Wr 403.02
Design Requirements of All Dams
Effective May 24, 2024#1716, eff 2-20-81; ss by #2207, eff 12-13-82; ss by #2900, eff 11-7-84, EXPIRED 11-7-90 New. #5080, eff 2-22-91; rpld by #6462-B, eff 2-21-97 New. #8414, eff 8-20-05; ss by #10510, eff 1-22-14; ss by #13980, eff 5-24-24Dam-Related Programs
An application for construction of a new dam or reconstruction of an existing dam shall incorporate the following minimum design requirements:
- (a) The embankment slopes shall be no steeper than 2.5 horizontal to 1 vertical unless a specific design for a steeper slope shows that the embankment is stable and capable of being safely maintained;
- (b) The embankment top width shall be a minimum of 6 feet;
- (c) Any spillway shall be constructed on properly prepared natural undisturbed ground;
- (d) Soil compaction specifications shall be shown on the plans;
- (e) Pre-compacted lift thickness shall be compatible with the material and equipment to be used, but no greater than 12 inches in depth;
- (f) A pond drain shall be incorporated for any new dam, except as noted in Env-Wr 403.03(a)(5); and
- (g) Trees, brush, and woody growth shall be removed from at least 15 feet beyond the footprint of the manmade structure.
Source. #1716, eff 2-20-81; ss by #2207, eff 12-13-82; ss by #2900, eff 11-7-84, EXPIRED 11-7-90 New. #5080, eff 2-22-91; rpld by #6462-B, eff 2-21-97 New. #8414, eff 8-20-05; ss by #10510, eff 1-22-14; ss by #13980, eff 5-24-24