Brett Martin StormCrate55 Soakaway Crate & Attenuation Cell (55 Tonne)

This Brett Martin StormCrate55 is a modular cellar crate system designed to be used as attenuation cells or for soakaway applications. They can be used in trafficked and non-trafficked areas including landscaped, pedestrianised, public open spaces, playgrounds, parking, driveways and access projects. The Storm Crate55 is a well-engineered product for the underground drainage and SUDS industry. This lightweight infiltration system is very strong and easy to install, making it a very attractive alternative cellular attenuation tank or soakaway crate option in the UK. Each Stormcrate55 unit includes 4 connector clips and 2 shear pin connectors with 12 pipe inlets.

Stormcrates are designed to be stacked together easily and quickly creating a below ground stormwater tank, allowing you to store water channelled from surface drains and building guttering with an effective jointing method. Alternatively they can be used as a infiltration and soakaway system. Stormcrate55 can be easily laid in a brick bond pattern, offering a unique approach to water storage solutions allowing contractors and specifiers opportunities to create bespoke designs to suit the exact demands for their projects or developments.

For a soakaway system, it is highly recommended to install your soakaway crates wrapped with a non-woven geotextile or protection fleece. This ensures that you protect the crates from being clogged up by debris, yet still allowing water to pass through. If you are installing an attenuation tank system, in addition to the geotextile you will need to use a geomembrane to ensure the water is retained within the attenuation cells.

Key Benefits of the PSM1A Polystorm-R Crate:

• Suitable for both attenuation and soakaway systems


• 100% Recyclable


• Only 4 StormCrates per 1m³


• Load bearing strength of 55 tonnes/m2


• Designed for untrafficked and trafficked applications


• Lightweight, easy to install & space saving, excellent benefits for site


• Integrated inlet and outlet

ELEMENT	VALUE
PHYSICAL PROPERTIES
Dimensions L x W x D	1200mm x 600mm x 347mm
Total Volume	0.25m3 (4 Crates = 1m3)
Unit Weight	15.5kg
Unit Storage Volume	0.2375m3
Void Ratio	95%
SHORT TERM COMPRESSIVE STRENGTH
Vertical	562 kN/m2
Lateral	70 kN/m2
SHORT TERM DEFLECTION
Vertical	153 kN/m2
Lateral	19 kN/m2

* Compressive strength at yield, maximum recommended value for design purposes.

Soakaway crate systems enable the surface water to run-off, accumulating in an below ground tank entering the surrounding land through a permeable geotextile or protection fleece. We advise that your groundworker or contractor carries out a percolation test on your soil and its conditions, to correctly calculate the number of crates for your project. As a typical guide, providing your soil type is not clay or heavy, you can roughly estimate the size of your soakaway using a ratio of 1 crate per 10m2 of surface area that you are draining. However we do recommend the correct tests are undertaken prior to designing your soakaway crate system. It you find that your ground conditions are not suitable for a soakaway system, then a holding tank or attenuation system will be required which typically discharges to an existing drain or water course by either gravity or via pumping at a pre-determined rate.

Sustainable Drainage Systems, also referred to as Sustainable Urban Drainage Systems or SuDS, have become a vital asset to prevent urban flooding for various developments across the UK, no matter how big or small. Extensive use of this type of stormwater attenuation/infiltration modules has helped relieve pressure on conventional surface water drainage systems in line with the SUDS program advocated by the environment agency. Stormcrate55 can be utilised in multiple SuDS techniques due to crates systems being perfect for stormwater management solutions. They prevent flooding during heavy rainfall periods by holding back excess water and then gently releasing the water back into the environment. By gently releasing, this prevents local watercourses and sewer networks become overflowed which results in floods being prevented.

Manufactured in the UK by Brett Martin, a global & UK supplier of plastic and drainage products provides the installer with a reliable crate system that will perform. They are passionate about being able to design and deliver products which facilitate not only fast but efficient installation with exceptional reliability, saving the installer time and money at the same time. All Brett Martin products ensure the highest possible levels of quality and performance as they are manufactured to exacting standards.

Manufactured to the standard BS EN ISO 9001:2015. In accordance with the recommended methodology and factors of safety given in Structural Design of Modular Geocellular Drainage Tanks, CIRIA C680 (2008), prior to the commencement of construction projects. The installer of a proposed geocellular crate structure should ensure that an appropriate design check has been carried out. For further product information, please refer to the multiple product documents on this page.