On commercial properties  as with domestic dwellings the size and scope of the effluent drainage field is calculated by the amount of people either living or working at the premises and by calculating the results of a percolation test ,this will give you the flow rate of effluent and the suitability of the land and sizes of pipe required, and how many meters of perforated pipe you will need,to build your effluent drainage field.

soakaways is a term commonly used by everyone, for both rainwater runoff and effluent amounts because it is liquid being absorbed into the ground,but effluent drainage fields are entirely different to a soakaway for rainwater.

Rainwater soakaways are often built underground from storm crates and covered with a geotextile cover or terram

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