Modular Geocellular Tanks for Stormwater Attenuation & Infiltration
High-strength, lightweight underground modules for soakaways, detention tanks, and OSD systems. Easy installation for roads, parking lots, and landscaping projects worldwide.
Key Advantages
High-strength geocellular tanks—also widely known as soakaway crates or stormwater modules—engineered for superior load-bearing capacity and underground stability.
High structural strength
Traffic-capable designs for installation beneath roadways, parking lots, loading areas, and landscaped zones.
Cost-efficient install
~95% void ratio reduces excavation, backfill, and export — smaller footprints, fewer truckloads.
Fast build, modular
Lightweight interlocking cells accelerate installs; typical reservoirs assembled at ≈1,000 m³ per week.
Hydraulic performance
Open-lattice flow paths deliver high permeability and low head loss across the tank — for uniform distribution and rapid drain-down.
Flexible, modular format
Configurable to site grades, utilities, and irregular shapes; works with permeable pavements and shallow cover.
Flood mitigation
On-site storage attenuates peak flows, protecting downstream pipes, basins, and critical assets.
Reuse-ready
Integrates with filtration/UV to supply irrigation and non-potable graywater uses.
Sustainable & durable
Recycled/virgin PP; engineered for long service life and end-of-use recyclability.
Product Detail Gallery
Engineered details for long service life: PP copolymer, high-void lattice, reinforced ribs to limit creep, and secure interlocks for stable assemblies.
Geocellular Tanks Applications
Under Parking Lots
Install modular tanks beneath parking lots / car parks to attenuate peak flows. Use lined detention with orifice/vortex control, or wrapped infiltration where soils allow.
Roads & Streets
Place below carriageways or verges to intercept highway runoff and reduce downstream surcharge. Traffic-capable with appropriate cover design.
Industrial & Logistics Yards
Heavy-duty storage for loading bays and logistics yards. Specify enhanced cover/strength class for HGV/tractor-trailer traffic; lined detention recommended.
Residential Soakaways
Compact geocellular soakaway crates for plots — wrapped in geotextile to infiltrate roof/drive runoff and relieve nuisance flooding.
Urban Plazas
Shallow-cover storage under plazas and podium decks for SuDS/LID. Attenuates runoff from hardscapes and protects combined sewers.
Sports Fields
Install under pitches or sidelines to capture cloudburst events. Choose detention or infiltration integrated with turf drainage layers.
Campuses & Healthcare
Concealed storage beneath access roads and parking for schools, universities and hospitals; reuse options for irrigation and other non-potable needs.
Transit & Park‑and‑Ride
Large-area systems under transit hubs / park-and-ride to cap discharge rates to legacy drainage. Supports phased build-out and inspection access.
Geocellular Tanks Technical Specifications
Core Module
| Module size | 1000 × 500 × 500 mm |
| Void ratio | ~95% |
| Material | Polypropylene (PP), recycled or virgin |
| Unit weight (typ.) | ~9.8 kg per module |
| Unit storage @95% | ~0.238 m³ (per 1000 × 500 × 500 module) |
| Primary functions | Stormwater attenuation & infiltration; rainwater harvesting (with treatment) |
| Interconnection | Modular interlock; lateral & vertical flow paths |
Strength Classes & Loading
| Class | Vertical load | Lateral load (tested) | Typical applications |
| Standard Tank | ≥ 30 T/m²(≥ 294.3 kN/m²) | 11.4 T/m² (114.6 kN/m²) | Landscaped areas, pedestrian zones |
| Heavy Tank | ≥ 45 T/m²(≥ 441.5 kN/m²) | 11.8 T/m² (118.8 kN/m²) | Car parks, light/medium traffic |
| Super Tank | ≥ 60 T/m²(≥ 588.6 kN/m²) | 18.4 T/m² (184.4 kN/m²) | Heavy duty, logistics yards, HGV routes |
Installation Depth Guidance
Cover depth varies with loading and ground conditions; the ranges below are indicative and must be verified by design.
Landscaped / Green Areas
Typical cover: 0.30 – 0.50 m
Use separation geotextiles; provide granular bedding/haunching per specification.
Car Parks & Light/Medium Duty
Typical cover: 0.50 – 0.80 m
Pavement build‑up per traffic class; consider shallow attenuation tank reinforcement where required.
Car Parks & Light/Medium Duty
Typical cover: 0.80 – 1.50 m+
Full structural design required, considering CBR, groundwater, settlement and frost.
Installation Gallery
A step-by-step guide to assembling our modular soakaway crates for constructing reliable stormwater attenuation tanks or infiltration systems.
System Integration
Geotextiles & Geomembranes
Pair the tank with nonwoven geotextiles for separation/filtration and with HDPE/LLDPE geomembranes for lined detention or containment. We can size liner areas, overlaps and seams, and provide quantity take-offs.
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FAQ
Answers to common technical and commercial questions.
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