"Impervious surface" means "impervious surface" as defined in RSA 483-B:4, VII-b, as reprinted in Appendix B.
N.H. Admin. Code § Env-Wq 1402.14
(See Revision Note at chapter heading for Env-Wq 1400) #9188, eff 7-1-08; renumbered by #9349 (from Env-Wq 1402.11)