The 3D composite drainage geonet is a three-layer geocomposite: a HDPE three-dimensional drainage core sandwiched between two nonwoven geotextile layers. It collects and conveys liquids along the plane — replacing a traditional gravel drainage layer with a thin, high-capacity drainage sheet that is faster to install and adds far less weight to the structure.
Specifications
| Core | HDPE three-dimensional drainage core |
| Standard | CJ/T 452 (3D Composite Drainage Geonet) |
| Core Thickness | 5 – 8 mm (custom available) |
| Structure | Double-sided composite nonwoven geotextile |
| Functions | Drainage / Filtration / Protection / Separation |
| Transmissivity | Selected and confirmed by project conditions (flow rate, gradient, overburden) |
Typical Applications
- Landfill leachate drainage layer above the geomembrane — replaces gravel drainage blanket
- Groundwater drainage behind retaining walls and under slabs
- Road and railway subgrade capillary water drainage
- Slope protection and sports field drainage
Why Replace Gravel with a Geonet?
- Thin profile: 5–8mm instead of 300mm+ of gravel — more usable volume in the landfill
- No aggregate hauling, washing or placement — faster, cleaner construction
- Consistent, uniform drainage capacity across the whole area
- Lower transport cost for remote or imported projects
Selection Advice
Transmissivity depends on core thickness, gradient and confining pressure. Tell us the expected flow rate, slope and overburden, and we will recommend the right core thickness — avoiding both under-design (flooding) and over-design (unnecessary cost).
Quick spec check: to order, please confirm — core thickness, geotextile weight (g/m²), width, quantity in m², application and expected flow conditions. We reply with pricing and a sizing recommendation within 24 hours.