What is a Composite Drainage Net

What is a Composite Drainage Net

A typical composite drainage net usually consists of three layers:

Core Layer (Middle Layer):

Material: A three-dimensional geotextile drainage net. Typically, extruded from high-density polyethylene (HDPE) through a specialized process.

Appearance: Resembles a three-dimensional mesh pad with protruding “ribs” forming a series of regular channels and voids.

Function: This is the core functional layer of the drainage net. It provides a stable, high-pressure-resistant open space allowing water, air, or other liquids to flow rapidly and smoothly laterally (water conveyance) within these channels.

Filter Layer (Upper and Lower Layers):

Material: Nonwoven geotextile. Typically, it is needle-punched to secure it to the upper and lower surfaces of the core net.

Function: The geotextile acts as a “filter.” It allows water to pass freely into the core drainage channels while effectively preventing surrounding soil, silt particles, and other fine materials from entering and clogging the core drainage channels, thereby ensuring the long-term effectiveness of the drainage system.

To summarize this structure:

Geotextile (Filtration) + Geonet (Water Conduction) + Geotextile (Filtration) = Composite Drainage Net

Material:

Typically made of high-density polyethylene (HDPE), low-density polyethylene (LDPE), or polyvinyl chloride (PVC).

The roughened surface is intended to enhance friction and adhesion.

Texture:

The surface has a textured or roughened surface, which improves performance in applications where grip and stability are important.

Thickness:

A variety of thicknesses are available, depending on the intended use and desired durability.