... of 3D drainage net and geotextiles:1.Compound drainage nets also called 3D geocomposite drainage, 3D geotechnique drainage ... materials.3.Property:inverted filter, drain away water, ventilation, protection.4.Product features: 1)Row water-borne strong (equivalent ... shorten the construction period, lower cost. 5.Compound drainage nets is mainly used for railways, highways, tunnels, municipal engineering, ...