"Dredge" as a verb means to make a body of water such as a lake, river, channel, harbor, or other area of surface water or wetlands wider, deeper, or cleaner by the removal of sand, silt, mud, rock, or other such material.
N.H. Admin. Code § Env-Wq 1502.17
(See Revision Note #1 at chapter heading for Env-Wq 1500) #9343, eff 1-1-09