From Drainage Materials
Geonet is a material made of HDPE that is designed to transmit both gasses and liquids in the horizontal plane. The geonet is most commonly installed between two layers of liner to act as a leak detection zone. If the primary liner is breached, the liquid will flow to a sump that is monitored for the presence of liquids. The thickness and structure of the geonet will determine the flow capacity of the geonet.