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You need to ensure its far enough from the structure to prevent damage \u2014 5 metres is the accepted distance, but this also depends on the calculated size of the soakaway.
Saturate the local soil \u2013 Fill each hole with a depth of at least 300mm. If the water drains rapidly \u2013 If it drains within 10 minutes, the hole should be refilled up to 10 times. If the water continues to drain away then this soil is unsuitable for a soakaway.
Then all you need to do is simple decide on the type of soakaway crate you require, and divide 1m3 by the volume of each individual crate. So if we take our Brett Martin Stormcrate crates as an example, each crate holds 0.25m3 of water, so 1m3 divided by 0.25 = 4 crates required.
Where ground has good soakage (such as sand/gravel) then the size/volume of a crate type soakaway can be calculated as follows: Volume = Roof area being drained x (50mm rainfall rate per hr/3000). These soakaways are normally filled with clean brick/block/concrete pieces no larger than 150mm.
The design method for sizing a soakaway is based upon the equation of volumes: I \u2013 O = S where: I = the inflow from the impermeable area drained to the soakaway; O = the outflow infiltrating into the soil during rainfall; S = the required storage in the soakaway to balance temporarily inflow and outflow.
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A soakaway is a hole dug into the ground which is used to return rain water back to the earth. The hole in the ground is filled with soakaway crates, shingle and crush. Soakaways are often a requirement for rural properties where a centralised stormwater runoff solution is not available.
In order to carry out a BRE 365 Soakaway Test you will need to excavate some trial holes, and fill then with water and watch how quickly in soaks away. In clay soils this can take a long time, so you may need to watch the hole for a few hours, in a gravel soils it could be all over in 10 minutes.
The design method for sizing a soakaway is based upon the equation of volumes: I \u2013 O = S where: I = the inflow from the impermeable area drained to the soakaway; O = the outflow infiltrating into the soil during rainfall; S = the required storage in the soakaway to balance temporarily inflow and outflow.
BRE365 Percolation Tests establish whether the ground at the site of a new development is suitable for infiltration forms of Sustainable Urban Drainage Systems (SuDS), such as soakaways.
How deep should a soakaway be? The Perforated pipe should be laid at a minimum depth of 200mm and a maximum depth of 700mm. This enables aerobic contact between the effluent and the drainage stone and soil particles.

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