"Defined channel" means an area in or on the ground that exhibits clear evidence of the passage of water and fluvial geomorphic processes, including bed scour, sediment transport, formation of bends, riffles, pools, braiding, point bars, and other common channel features. The term includes but is not limited to bedrock channels, gravel beds, sand beds, and silt beds.
N.H. Admin. Code § Env-Wt 102.51