Composite Drainage Mesh (also known as three-dimensional geotextile drainage board, tunnel drainage board, and drainage board) is composed of double-sided bonded plastic mesh with a geotextile fabric that allows water permeation. It can replace traditional sand and gravel layers and is mainly used for drainage in landfill sites, road bases, and tunnel inner walls.

In railway and highway infrastructure, the safety and service life of the projects are inextricably linked to their drainage systems, with geosynthetic materials being a crucial component of these systems.

Composite drainage net is a new type of geosynthetic drainage material. Made from high-density polyethylene (HDPE) and processed through a special extrusion molding technique, it features a triple-layered structure. The central ribbing has high rigidity and is longitudinally arranged to form drainage channels, while the transversely arranged ribs support the geotextile to prevent it from being embedded in the drainage channels, maintaining excellent drainage performance even under high loads. The double-sided bonded geotextile, when used in conjunction with the composite drainage net, offers comprehensive properties of "anti-leaching -- drainage -- ventilation -- protection," making it the ideal drainage material currently available.