A geonet is a three-dimensional synthetic drainage layer engineered to manage the flow of liquids and gases in civil engineering, environmental, and geotechnical applications. Constructed from high-density polyethylene (HDPE), it features a structured configuration of intersecting ribs that form open channels, allowing for rapid and consistent fluid movement.

Geonets are commonly used in layered systems where reliable drainage and filtration are critical, helping to reduce hydrostatic pressure and maintain the stability of surrounding materials. Their durable, chemical-resistant composition makes them ideal for long-term performance in a variety of engineered environments.