Slide 55 of 119
Notes:
An infiltration trench is a rock-filled trench with no outlet that receives stormwater runoff. Stormwater runoff passes through some combination of pretreatment measures, such as a swale and detention basin, and into the trench. There, runoff is stored in the voids of the stones, and infiltrates through the bottom and into the soil matrix. The primary pollutant removal mechanism of this practice is filtration through the soil matrix.
Infiltration trenches have select applications. While they can be applied in most regions of the country, their use is sharply restricted by common site factors such as potential groundwater contamination, soils, and clogging.