Trench Soakaways

As the name suggests, Trench Type Soakaways are basically rectangular trenches filled with granular material (40mm - 60mm, void ratio of 0.3) and surrounded with a geotextile membrane. Often a cheaper alternative to the concrete ring type soakaway, they are also more commonly used for larger impermeable areas.

Trench Soakaways

In trench soakaways, the movement of suspended and floating material into the distributor pipe can be minimised by using wet wells which act as a silt trap to catch solids before entering the granular material and, thus, choking the soakaway and reducing its effectiveness. Such wet wells will require periodic maintenance where the silt and debris rises to the level of the outgoing pipe.

Trench Soakaways