Drainage Central offer Brett Martin's StormCrate 55 Attenuation Soak Away Crates.
Storm Crate Dimensions: L1200mm x W600mm x D347mm
One crate = 0.25m3
95% Void Ratio
All crates are manufactured from recycled material.
The StormCrate55 is ideal for soakaways, creating a temporary space for water to sit and eventually soak away.
This Storm Crate has a shallow installation depth with only 250mm cover required for driveway loading, meaning less digging and site spoil. It is also a high strength crate with a load bearing of up to 55 tonne when installed correctly.
How do I work out how many soakaway crates I need? (these notes are for general guidance only, it is dependant on the application - there are many different factors to take into account and usually a drainage engineer would do the calculations for an attenuation or infiltration system)
The full list of information preferred is as follows:
Basic Example
Roof Area 283.03m² x 0.02 = 5.67m³
23 crates would give 5.75m³ of capacity
This is only for single dwelling developments, and only for soakaways where the soil is suitable for soakaways; ie not clay. You cannot say for attenuation as everything depends on the allowable flowrate into the public sewer.Storm Crate 55 Brochure.