Installing soakaway crates will help to control the level of surface water in both domestic and commercial projects. This is particularly important in areas prone to heavy rain or flooding. This guide will help you to understand how many soakaway crates you need for your project.


How many soakaway crates do I need?How soakaway crates work

Soakaway: By wrapping the soakaway crates in a permeable geotextile, water is allowed to slowly filter out into the surrounding earth at a steady rate. The slow rate of release helps to protect against flooding and stagnant surface water.

Attenuation: The addition of a waterproof geotextile and pipework redirects the water to a local body of water or existing sewer network. The installation of a filter controls the flow of the water, thereby protecting against the risk of flooding.


How many soakaway crates do I need?

How many soakaway crates you need will depend on variables including space available, soil type and incoming/outward flow rate. A groundworker or installer can perform a percolation test on the soil to determine the ground conditions. For example, clay-based soil is heavy and can cause water to filter out slowly, rather than draining freely. This test will give the area in square metres required.

Soakaway crates are modular, meaning they can be stacked on top of or next to one another. Each soakaway crate is a different size, therefore the brand you choose can determine how many crates your system will need. Here at Drainage Superstore, we have a number of soakaway crates to choose from. The list below also shows how many crates fit per m3.

ACO StormBrixx soakaway crates: 2.28 crates per m3

•DYKA Rainbox 3S soakaway crates: 3.3 crates per m3

Graf Stormwater soakaway crates: 3.3 crates per m3

Polypipe Polystorm soakaway crates: 5 crates per m3

Soakaway crates being installed


With so many variables, it can be difficult to know how many soakaway crates you need for your project. Our drainage experts will be able to offer you advice and recommendations based on your requirements and preferred materials. Give our helpline a call on 01752 692 221, or use our live chat in the bottom right-hand corner of the website.

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