Rain Bloc Compact 300L Storm Soakaway Crate

The Rain Bloc Compact 300 is a modular stormwater soakaway and attenuation crate designed for efficient surface water management in SuDS compliant systems. With a high void ratio of 95 percent, it provides substantial water storage while reducing excavation volume compared to traditional stone soakaways.

Each crate offers a gross storage capacity of 300 litres and is manufactured from recycled polypropylene for long term durability and resistance to ground conditions. The compact modular design allows crates to be connected both lengthways and crossways, making it suitable for flexible tank layouts in restricted or irregular spaces.

Rain Bloc 300 is suitable for both infiltration and attenuation applications. When wrapped in a permeable non woven geotextile membrane, it allows filtered stormwater to disperse into the surrounding ground while preventing soil fines from entering the system. For attenuation or retention systems, the crates should be encapsulated in an impermeable geomembrane with a suitable protection fleece.

The system is rated for use beneath landscaped areas, driveways, car parks and trafficked surfaces, including HGV loading, provided minimum cover depths and suitable backfill materials are achieved. Typical applications include residential soakaways, commercial drainage systems, car parks and urban developments where reliable stormwater control is required.

Limitations should be assessed at design stage. Maximum installation depth and cover requirements depend on loading class, soil type and groundwater conditions, and professional design checks are recommended for deeper or heavily trafficked installations.

• 300 litre storage capacity per crate
• High 95 percent void ratio for efficient water storage
• Suitable for infiltration or attenuation systems
• Modular design for flexible tank layouts
• Rated for use beneath trafficked areas with correct cover
• Manufactured from recycled polypropylene

Manufactured from recycled polypropylene. This provides resistance to chemicals, groundwater and biological attack while maintaining structural strength under long term loading.

Product Name: Rain Bloc Compact 300
Nominal Size: 1200 mm x 600 mm x 420 mm
Gross Storage Volume: 300 litres
Net Storage Volume: approx. 285 litres
Void Ratio: 95 percent
Unit Weight: approx. 17 kg
Vertical Load Capacity: up to 60 tonnes/m²
Lateral Load Capacity: up to 15 tonnes/m²
Maximum Earth Cover: up to 3.0 m
Maximum Installation Depth: up to 7.5 m (soil dependent)
Material: Recycled polypropylene
Origin: Manufactured in Europe

Minimum Cover Depths (Indicative)

Pedestrian and landscaped areas: 250 mm
Vehicle traffic: 250 mm
HGV traffic: 500 mm

Geotextile Membrane Option (Single Sheet Supply)

Non woven geotextile membrane supplied as one pre cut sheet per order
Sheet size matched to fully wrap the total number of crates purchased, including base, sides and top

Typical sheet sizes supplied

1 crate: 6.75 m² (2.25 m x 3.0 m)
3 crates: 13.5 m² (2.25 m x 6.0 m)
6 crates: 18.0 m² (2.25 m x 8.0 m)