Also known as soakaway or soakage testing, infiltration testing is undertaken to ascertain the drainage characteristics of a site. Infiltration testing in accordance with BRE365 forms a common part of any investigation, and is typically undertaken within a mechanically excavated trial pit.

Percolation testing provides information for the design of foul drainage systems, for example for the installation of septic tanks, and is undertaken in accordance with Building Regulations Approved Document H.  

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