"Impervious cover" means a structure or a land surface with a low capacity for infiltration, including but not limited to compacted soils with a curve number of 98 or greater, pavement, roofs, roadways, and driveways.
N.H. Admin. Code § Env-Wq 1502.32
(See Revision Note #1 at chapter heading for Env-Wq 1500) #9343, eff 1-1-09