RainBloc 300L Storm Soakaway Crate

Heavy-Duty Stormwater Crate for Driveways, Car Parks & Landscaped Areas

The RainBloc 300L is a high-strength stormwater soakaway crate designed for infiltration and attenuation in both domestic and commercial drainage applications. Made in the UK from recycled polypropylene, it offers robust water management in trafficked zones, including those used by HGVs.

Product Benefits

Reliable flood control

• Holds up to 300 litres (gross) per crate, reducing pressure on surface drainage systems

• 95% void ratio for efficient stormwater capture and release

• Suitable for SuDS compliance and local authority regulations

Versatile installation

• Use as infiltration (soakaway) or attenuation system depending on membrane wrap

• Modular format allows fast installation in single or multi-layer configurations

• Suitable for landscaped areas, private drives, and commercial surfaces

Strong and sustainable

• Load-tested for 60 tonnes/m² vertically and 15 tonnes/m² laterally

• Compatible with car, van, and HGV traffic

• Manufactured from upcycled polypropylene and certified to ISO 9001

Cost-efficient transport

• Stackable design enables delivery of up to 90m³ per articulated lorry, reducing site deliveries and emissions

Optional Geotextile Membrane

Pre-cut geotextile fleece is available to suit typical crate quantities:

• 1 crate – 2.25m x 3m (6.75m²)

• 3 crates – 2.25m x 6m (13.5m²)

• 6 crates – 2.25m x 8m (18m²)

Use a non-woven geotextile (e.g. NW8 100gsm) for soakaway systems, or a waterproof membrane for full retention.

Technical Specifications

Installation Guidelines

• Suitable for landscaped and trafficked areas (up to 40 tonnes vehicle load)

• Minimum cover depth:

  • 0.3m for pedestrian/landscaped zones

  • 1.1m for HGV traffic

• Maximum installation depth varies by soil type:

  • Up to 7.5m (with high-quality backfill, φ’380)

• Always consult a qualified engineer for site-specific structural design

Frequently Asked Questions

Can I use these crates under a driveway?

Yes, the RainBloc 300L supports up to 60 tonnes/m² vertically, making it suitable for driveways, car parks, and other trafficked areas.

Is this crate suitable for SuDS projects?

Yes. It is ideal for Sustainable Drainage Systems (SuDS), providing high-capacity infiltration and attenuation.

Do I need a membrane?

Yes. Use a non-woven geotextile membrane for soakaways or an impermeable liner for retention systems.

How many crates do I need for a 1m³ soakaway?

You’ll need approximately 3.3 crates per cubic metre.

Can I inspect the system after installation?

Not with standard crates alone. For inspection, use RainBloc Inspect units as part of the system.