Zhengling Oasis sheet drain is a two-part prefabricated soil sheet drain consisting of a formed polystyrene / polyethylene core covered with a non-woven needle-punched polypropylene geo-textile filter fabric bonded to the dimple side of the core. The fabric allows water to pass into the drain core. The core allows the water to flow to designed drainage exits.

Characteristics:
Height of knobs: ~10mm  
Mass per unit area: ~700g/m2 
Compression strength: ~300 kN/m2 (= 30 tons/m2) 
Air volumen between the knobs: ~5.6 L/m2 
Water drainage capacity: depending on compression and application
Length of roll: 15/25m 
Width of roll: 1,3m;