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Calculation Tools

Use the below calculation guidance notes to work out various measures needed for specific soakaway or attenuation applications. Please also visit our Legislative Guidance section for specific information on the design and best practice for Sustainable Drainage Systems.


PDF Soakaway Converter Conversion tool of a specified nominal diameter pre-cast concrete ring soakaway volume into the equivalent number of Polystorm & Polystorm Lite units.
PDF Polystorm Percolation Test A simple guide to performing a Percolation Test for the design of a soakaway system using Polystorm & Polystorm Lite units. The guide follows the procedure laid out by BRE Digest 365.
 Calculation Tools