drainage geocomposite (GCD) for vertical drainage of trenches or similar. The lower edge of the  roll has an extended Geotextile pocket into which a polymer collection pipe can be installed on-site, to rapidly form a trench drainage system.It is made by thermobonding a three-dimensional drainage mat of extruded polymer monofilaments between two filtering geotextiles that may also perform as separation or protecting layers. 

This solution is often used alongside highways and railways to provide long-term reliable vertical drainage capacity.