Soakaways Infiltration Trenches And Chambers
Soakaways, infiltration trenches and chambers are all LID technologies, similar in that they consist of sub-surface reservoirs that store and infiltrate stormwater runoff at the lot level. These technologies provide an opportunity for infiltrating runoff from roofs, walkways, parking lots, and low to medium traffic roads without consuming a substantial amount of land area. They are particularly useful on sites where space is limited and directing runoff to vegetated areas on the lot is not feasible or preferred.
While these three technologies function similarly, there are significant differences in their design elements. Soakaways typically consist of rectangular or circular stone-filled, geotextile-lined excavations that receive roof and walkway runoff via a perforated pipe inlet. The soakaway stores the water and allows it to infiltrate into the native soil.
An infiltration trench is a design variation in which the excavation is in the form of a long rectangular trench, often situated along the rear lot line away from the building foundation. This design is usually more efficient and cost effective where buildings are close together and the only space available for infiltration is a narrow strip of land between buildings or within the infrastructure rights of way. For both soakaways and trenches that treat roof runoff, pre-treatment requirements are minimal and only require the installation and regular cleaning of roof leader screens that trap leaves and other debris.
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