"Geotextile" means any permeable textile used with foundation, soil, rock, earth or any other geotechnical engineering-related material as an integral part of a man-made structure or system which is designed to act as a filter to prevent the flow of soil fines or other particles into drainage systems, or to provide planar flow for drainage, or to serve as a cushion to protect geomembranes, or to provide structural support.
N.H. Admin. Code § Env-Sw 103.13
(See Revision Note at chapter heading for Env-Sw 100) #8460-B, eff 10-28-05