Tenax Tendrain tri-axial consists of three structural ribs. The top and bottom ribs keep the filter geotextile layer out of the central flow channel, while the center structural ribs provide load bearing and create flow channels. Moreover, the significantly larger central ribs run parallel to the flow direction, resulting in tremendous hydraulic performance expecially for long-term flow requirements under heavy compressive loads. Thus creating a leachate collection and removal system that can withstand heavy compressive loads as well as maintain the flow capacity necessary to limit the head within the drainage layer.