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Definition
Drainage geocomposite (also known as dimple drainage board or drainage board) is a prefabricated drainage system composed of a polymer core laminated with a filtration geotextile. The core structure features regular dimples (or cusps) forming a three-dimensional network, creating a "drainage-filtration-protection" integrated functional layer
Drainage geocomposite serves as an ideal alternative to traditional granular drainage layers, providing rapid water collection and transmission while preventing soil particle intrusion and clogging
1. Functional Principles
1 Drainage Mechanism
The drainage function operates in three stages:
Collection: Water permeates through the geotextile into the core cavities; the geotextile filters out soil particles
Transmission: Water flows within the three-dimensional channels along the plane direction
Discharge: Water is directed to preset outlets (drainage ditches, catch basins, downspouts)
2 Additional Functions
Protection: Acts as a protective layer for waterproofing membranes against sharp objects in backfill
Capillary Break: The air gap interrupts capillary rise, providing vapor/gas barrier functions
Water Retention: Perforated cores can store water for sustained plant growth on green roofs
2. Main Applications
1 Building Construction
Basement Waterproofing:
Green Roofs / Roof Gardens:
Interior Moisture Protection:
2 Transportation Engineering
Highway/Railway Subgrade Drainage:
Tunnel Lining Drainage:
Retaining Wall Drainage:
3 Hydraulic and Environmental Engineering
Dam Drainage:
Landfills:
Athletic Fields:
4 Special Applications
Saline/Expansive Soils:
Permafrost Regions:
5. Installation Precautions
5.1 Material Storage and Protection
Store drainage boards in dry, ventilated areas, away from direct sunlight and fire sources
Stack vertically or flat, do not tilt or cross-stack; stacking height ≤3 layers
Cover promptly after installation to prevent mechanical damage and UV exposure
5.2 Substrate Preparation
Ensure substrate is smooth, compact, dry, and free of sharp debris
Verify waterproofing membrane (if present) is accepted before drainage board installation
Substrate slope shall meet design requirements for proper drainage
Connect drainage boards reliably to drainage ditches, catch basins, downspouts, etc.
At drain pipe connections, remove geotextile from core backside, wrap and fix board to pipe
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