Low-Profile Attenuation Crate For Shallow Dig Stormwater Management
The Envirocrate 100L is a shallow, high-strength soakaway crate designed for sites where excavation depth is restricted. With a compact profile just 100mm high, it’s ideal for use under roof gardens, landscaped areas, podium decks, and car parks. Each unit provides 100 litres of stormwater storage, supporting attenuation and infiltration systems in both residential and commercial settings.
Product Benefits
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Suitable for shallow installs – just 100mm deep
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91% void ratio allows high water storage volume
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Handles heavy loads – over 320kN/m² compressive strength
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Made in the UK from recycled polypropylene
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Stackable and lightweight for easy handling and fast installation
This crate supports SuDS-compliant water management, helping control surface water runoff by storing and slowly releasing rainwater. Use with geotextile membrane for infiltration systems, or a sealed geomembrane layer for water retention and reuse.
Key Features
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100L storage per unit – 10 crates = 1m³ capacity
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Lightweight 8kg unit – easy to handle and install
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Low dig depth – suitable where space is limited
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Works in both attenuation and infiltration setups
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Robust lateral strength supports varied ground conditions
Minimum Cover Requirements (By Axle Weight)
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1 tonne: 200mm
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2 tonnes: 250mm
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5 tonnes: 300mm
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10 tonnes: 400mm
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12 tonnes: 450mm
Optional: Pre-Cut Geotextile Wrap
If selected, each crate is supplied with a 100gsm NW8 non-woven membrane sheet cut to size:
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1 crate: 2.25m x 3m (6.75m²)
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3 crates: 2.25m x 7m (15.75m²)
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6 crates: 2.25m x 13m (29.25m²)
Membrane prevents soil ingress while allowing water to pass through.
Technical Specifications
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Nominal size: 1000mm x 1000mm x 100mm
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Storage volume: 100 litres per crate
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Unit weight: 8kg
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Void ratio: 91%
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Compressive strength: >320kN/m²
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Lateral strength: >150kN/m²
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Material: Recycled polypropylene
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Recyclable: Yes, at end of life
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Standards: Manufactured to ISO 9001 (UK)
FAQs
Can this crate be used under vehicle traffic areas?
Yes, provided the correct minimum cover depth is maintained. It supports up to 450mm cover for HGV use.
Is it suitable for water reuse systems?
Yes – when wrapped in an impermeable geomembrane, it can store rainwater for reuse in irrigation or greywater applications.
Do I need a membrane?
Yes. Use a non-woven geotextile for infiltration, or an impermeable geomembrane for sealed systems.
How many crates do I need per cubic metre?
You’ll need 10 crates to create 1m³ of storage.
Is installation complicated?
No – each crate is lightweight and modular. Installation is straightforward and can often be completed without mechanical lifting.
