The 'Etobicoke Exfiltration system' (1994), Etobicoke ON
A pair of perforated pipes can be seen in this manhole during cleaning operations. Four connections in total as this manhole is part-way along the system.
The downward movement of water through the soil, the downward flow of runoff from the bottom of an infiltration BMP into the soil.
Loss of water from a drainage system as a result of percolation or absorption into the surrounding medium (e.g., the infiltration of water into the native soil through a perforated pipe wall as it is conveyed).