Shallow Geocellular Attenuation Tank: The Structural Sub-base Replacement System
Replace traditional aggregate with high-void (95%) interlocking modules. Ideal for permeable paving, podium decks, and blue-green roofs with limited cover depth.
Benefits of ultra shallow stormwater mamagement
95% void ratio
Maximises storage in ultra-shallow build-ups.
85–250 mm module heights
Ultra-shallow to medium depth
1000 × 500 mm module plan
Standard footprint for fast layout
Up to 30% less excavation
Reduce dig, spoil and haulage versus
Clip-lock shear connectors
Maintains shear continuity and lateral restraint under traffic loads
Protects Buried Utilities
Shallow installation avoids conflict with existing underground pipes and cables, reducing utility diversion costs.
What is Shallow Attenuation ？
Our Shallow Attenuation Tank creates a high-strength structural raft that replaces traditional aggregate sub-base. It allows for source control stormwater management directly beneath permeable block paving or porous asphalt, eliminating the need for deep excavation.
Applications
Permeable Paving Sub-base
Acts as a structural raft to replace aggregate beneath permeable block paving and porous asphalt. Handles heavy traffic loads with minimal settlement.
Urban Plazas & Hardscapes
High-strength storage for pedestrian and emergency vehicle areas. Installs easily around shallow utilities in crowded urban centers.
Blue-Green Roofs & Podiums
Ultra-shallow green roof drainage layer. Protects waterproofing on podium decks while providing high-capacity attenuation in limited depths.
Sports Pitches & Soft Landscapes
Invisible drainage and attenuation beneath natural or artificial turf. Keeps surfaces dry and playable without deep trenching.
Installation guide
- Prepare Subgrade
Excavate to design level and compact the formation. Ensure the subgrade meets the required CBR (California Bearing Ratio) to support the structural raft. - Lining Strategy
For Infiltration: Line with non-woven geotextile to allow groundwater recharge.
For Attenuation: Seal with impermeable geomembrane to create a watertight tank. - Install Tank Modules
Place Shallow Attenuation Tank modules. Secure with clip-lock connectors to form a monolithic, high-strength structural raft that resists lateral movement. - Connect & CloseInstall
Inlets, outlets, and inspection ports. Wrap the system completely with the specified geosynthetics (geotextile or geomembrane) to prevent silt ingress. - Surface Finish
Place the bedding layer directly on the tank, followed by permeable block paving, porous asphalt, or concrete finish.
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