Soakaway Crates | Soakaway Crate | Soakaways | Soak Away | Attenuation Crates

A soakaway crate is designed to manage excess surface water by temporarily storing rainwater underground and allowing it to gradually infiltrate into suitable surrounding ground. These modular crates provide a practical water drainage solution for driveways, patios, roofs and other areas where effective rainwater management is required. They can form part of both domestic and commercial drainage systems.

Soakaway crates, a vital component in modern drainage solutions, are designed to efficiently manage surface water, particularly in areas prone to flooding or heavy rainfall. These crates, also known as modular water storage cells, are used in the construction of soakaway systems, which aid in the controlled release of excess water into the ground. This category on build4less features an array of soakaway crates, each tailored for specific needs and capacities.

Types of Soakaway Crates

20 Tonne Soakaway Crates

A prominent type within this category is the 20 Tonne Soakaway Crate, measuring 400mm x 1m x 1m. These crates, offered by vendors like DAVANT, are designed to withstand substantial weight, making them ideal for installations under driveways, parking lots, or other areas subject to heavy loads. Their robust construction ensures longevity and reliability in water management. 

How Does a Soakaway Crate Work?

Rainwater is typically directed from gutters or other collection points through a drain pipe or drainage pipe towards the soakaway system. The crates create an underground void that holds water before releasing it gradually into permeable soil. Appropriate fittings, pipework and geotextile materials may be required depending on the system design and ground conditions.

Soakaway Attenuation Systems

Soakaway attenuation provides a controlled approach to managing high volumes of rainwater. Where infiltration into the ground is unsuitable or needs to be restricted, attenuation systems can temporarily store water before releasing it at a controlled rate into an approved drainage outlet.

Silt Trap and Inspection Chambers

A silt trap can be installed upstream of a soakaway to capture sediment and debris before water enters the crate system, helping reduce the potential for blockages and maintaining long-term performance. Inspection chambers can also provide access to sections of the drainage network for inspection and maintenance.

Connecting to Underground Drainage

Soakaway crates can form part of a wider underground drainage installation incorporating drainage pipe, connectors and other fittings. Depending on the project, the wider system may also include twinwall pipe, ducting or a land drain to manage water across different areas of a property or site.

Choosing a Soakaway Crate for Water Drainage

When choosing crates, consider the expected volume of surface water, available installation space, soil infiltration rate and anticipated loads above the system. The required capacity should be calculated for the individual project rather than simply choosing the number of crates based on available space

Aqua Storm and Modular Drainage Solutions

Products such as Aqua Storm and other modular soakaway systems offer a space-efficient approach to underground rainwater storage. Individual crates can be combined to create a system suited to the required capacity, helping provide flexible drainage and attenuation solutions for a range of residential and commercial projects.

Selection Guidelines

Choosing the right soakaway crate involves considering several factors:

• Load Capacity: Ensure the crate can withstand the weight of the overlying soil and any surface load, especially in areas with vehicular traffic.
• Size and Scalability: Assess the area's size and the volume of water to manage. These crates are modular and can be scaled to fit various project sizes.
• Installation Environment: Consider the soil type and environmental conditions. In areas with dense clay, additional considerations for water dispersion may be necessary.

Surface Water & Water Drainage Solutions

Managing surface water effectively is essential for protecting buildings, driveways and landscaped areas from flooding and water damage. A soakaway crate is designed to collect, store and gradually disperse rainwater into the surrounding ground, reducing pressure on underground drainage systems. Suitable for residential and commercial projects, soakaway systems can be combined with drainage pipe, land drain, inspection chambers, and silt trap components to create a complete water drainage solution. Our range includes high-quality Aqua Storm soakaway attenuation crates and compatible drainage fittings, making it easy to build reliable underground systems for stormwater management. Whether you're installing new underground drainage, expanding water storage capacity or upgrading existing treatment and attenuation systems, our durable products are designed for long-lasting performance and straightforward installation.

Benefits of Soakaway Crates

• Prevents pooling & localised flooding – Soakaway Crates have buffers stormwater to protect paving, lawns, and foundations.
• Supports SuDS best practice – Soakaway Crates promote natural infiltration and help reduce pressure on drains.
• Low-maintenance once installed – Soakaway Crates have no moving parts; a simple, robust below-ground solution.
• Scalable & modular – Soakaway Crates add crates to match your roof/paved area and site constraints.
• Discreet finish – sits under lawns, gravel, or driveways with the right cover depth.
• Cost-effective – fast to handle and install compared to traditional rubble soakaways.

Applications of Soakaway Crates

• Residential: roof downpipes, patios, paths, garden landscaping, under-lawn storage.
• Driveways & hardstanding: beneath block paving or gravel (use driveway-rated crates and correct cover).
• Commercial & light industrial: courtyards, small car parks, loading areas (engineer-designed).
• Retrofit drainage upgrades: replace failed rubble soakaways with predictable storage capacity.
• Permeable paving sub-base integration, where specified by your designer.

Installation Tips for Soakaway Crates

Always follow the manufacturer’s instructions and your approved design.

• Excavate to the designed dimensions; keep sidewalls stable and base level.
• Blind the base with sharp sand or a suitable protection layer to prevent geotextile damage.
• Line the excavation with non-woven geotextile, leaving enough to wrap over the top.
• Assemble & place crates in the specified layout; interlock per guidance.
• Connect pipework (inlet, overflow/relief, and any inspection points) as detailed in the design.
• Wrap & seal the geotextile fully around the crates; tape overlaps neatly.
• Backfill & reinstate with selected material; achieve the required cover depth before trafficking.

Why Choose B4L (Build4Less)?

• Trade-trusted brands & specs: A curated range that covers garden installs through to driveway-rated systems.
• Value without compromise: Competitive pricing, frequent multi-buy options, and clear delivery info.
• Fast, nationwide delivery: Reliable UK coverage with brand-specific thresholds.

Complete your drainage project with products from our related collections. Pair your soakaway system with Drainage Pipes for efficient water flow, and Inspection Chambers for easy maintenance and access. You can also browse our Channel Drainage collections to create a complete, reliable drainage solution for residential and commercial projects.

Frequently Asked Questions

What is a soakaway crate?

A soakaway crate is a lightweight modular unit that creates an underground storage void, allowing rainwater to collect and gradually soak into the surrounding soil, helping to manage surface water runoff.

Where are soakaway crates used?

Soakaway crates are commonly installed beneath driveways, patios, gardens, car parks and landscaped areas as part of a sustainable water drainage system.

Can soakaway crates be connected to drainage pipes?

Yes. Soakaway crates are designed to connect with drainage pipe systems, allowing rainwater from roofs, gutters and surface drains to be safely directed underground.

Are soakaway crates suitable for heavy-duty applications?

Many soakaway crate systems are engineered to support domestic driveways and certain commercial applications when installed correctly. Always check the manufacturer's load rating before installation.