This 2 year study initiated in 1996 investigated an exfiltration system in Toronto (formerly Etobicoke) which consisted of an innovative underground piping concept designed to reduce stormwater volumes and pollutant loads that discharge to receiving waters by promoting infiltration of stormwater runoff.

In the system, stormwater enters a conventional storm sewer and drops into two perforated pipes that are installed below and parallel to the storm sewer.  From the perforated pipe, the water exfiltrates into a gravel trench and overflows surcharges through the conventional storm sewer.  Monitoring for water quality and quantity was undertaken under the SWAMP Program at the Princess Margaret Boulevard exfiltration site.

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