High-Strength Tri-dimension Composite Drainage Network for Landfills

1. Leachate Collection and Removal

Leachate is generated in landfills through rainfall infiltration, moisture contained in waste and waste decomposition. If it is not collected and removed efficiently, liquid can accumulate above the liner system, increasing the hydraulic head and placing additional pressure on the containment structure. 3D composite drainage network can be installed within the designed drainage layer above the landfill geomembrane. Leachate passes through the filter geotextile and enters the drainage core. It flows along the designed gradient toward perforated collection pipes, drainage trenches or sumps before being transferred to the leachate treatment system.

2. Landfill Side Slope Drainage

Landfill side slopes require controlled drainage to prevent liquid from accumulating within the liner system. Composite drainage network installed along the side slope provides an in-plane pathway for liquid flow. It directs collected liquid toward toe drains, collection pipes or other designated drainage outlets. Geocomposite drainage net also reduces the amount of aggregate that needs to be transported and placed.

3. Leak Detection in Double-Lined Landfill Systems

Some landfills use a double-liner configuration consisting of a primary and a secondary containment layer. A separate leak detection system may be installed between the two liners. A composite drainage network can be incorporated into this intermediate drainage layer to meet the engineering design. If leakage occurs through the primary liner, the liquid can flow through the drainage pathway toward monitoring pipes or collection points.

4. Drainage in Landfill Final Cover Systems

After landfill closure, rainfall can infiltrate the final cover system. If water remains trapped within the cover, it may increase internal water pressure and affect the performance of the cover and slope drainage system. A composite drainage network can be installed within the designated drainage layer to collect and convey infiltrating water toward drainage pipes or channels.