Soakaway crates, otherwise known as plastic stormcrates, are an efficient and long-established method of dealing with excess surface water.
They are particularly useful in areas that experience higher than average rainfall. Soakaway crates work by slowly dispersingwater into the surrounding soil, without putting strain on pipes and sewers.
How to install a soakaway crate
Soakaway crates are straightforward to install. Just follow these simple steps:
- Dig a hole to the size of the crate, ensuring that it’s level
- Wrap the soakaway crate in a geotextile membrane
- Place the crate into the ground
- Connect your soakaway crate to the surface drainage system
Whilst plastic stormcrates are easy to install, it is vital that you choose the correct size for your needs.
Factors to consider when choosing soakaway size
The most accurate way to calculate the size and number of soakaway crates you will require is to perform a soil percolation test. This will determine the soil conditions and give you a better idea of the soakaway design that will work best for your needs.
If a soil percolation test isn’t an option, there are other factors to take into account that will give you a general indication of how much rainwater your soakaways will need to handle.
Firstly, you should measure your roof. This will give you a rough idea of the amount of rainwater that will be channelled from your roof down to the soakaway.You’ll then be able to choose plastic stormcrates with an adequate storage volume for your needs.
Next, measureyour patio and driveway. Any impermeable surface where rainwater could accumulate should also be measured. This is because water will flow from these areas down to your plastic stormcrates.
Add up the measurements of all these areas, then take a look at the chart below to select the ideal size of soakaway crate for your requirements.
| Measurements of roof and other impermeable areas | Soakaway crate size |
| 50 m² | 1000 litres (1.0m³) |
| 60 m² | 1200 litres (1.2m³) |
| 80 m² | 1600 litres (1.6 m³) |
| 100 m² | 2000 litres (2.0m³) |
As a general guide, the most common size of soakaway crate for use in residential properties in areas of average rainfall is one cubic metre.
It’s important you have enough room for your plastic stormcrates before you start digging. They need to be installed at least 5 metres away from your property’s walls, and at least 2.5 metres away from boundaries.
Where can I purchase soakaway crates?
When purchasing soakaway crates, either as a property developer or homeowner, it’s vital that you go to a trusted supplier.
Build Plumb Plastics supply a range of ready built soakaway crates and accessories, including silt traps, flow control units and adaptors, all at highly competitive prices. If you would like more information on plastic stormcrates, or have any questions about what size of soakaway crate would be right for your needs, don’t hesitate to get in touch with their friendly team on 01206 572980.
