These devices have a high holding capacity, which can be used to create underground structures for containing large amounts of water or allowing infiltration into the soil. Ultralight and with a modular parallelepiped honeycomb structure, they are made by assembling PVC sheets appropriately shaped by thermoforming.
The drainage system consists of assembling these modular packages (side by side and overlapping) to create buried structures:
- Infiltration tanks (if wrapped in a geotextile);
- lamination or accumulation tanks (if wrapped in a geomembrane).