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The Etobicoke Exfiltration System (EES), named after the first installation in Etobicoke (now part of the City of Toronto) in 1991, consist of installation of two perforated pipes installed in a storm sewer trench bedding material that are wrapped in filter cloth and plugged at their downstream ends.The system allows the distribution of collected stormwater runoff along sewer system (using perforated pipes)and its storage (in the bedding material) and exfiltration into the surrounding soil.EES was devised as a Best Management Practice (BMP) aimed at managing the peak flow, volume, quality, duration and frequency of stormwater discharges to receiving water bodies, and proved to be a cost efficient and robust option through more than 20 years of service with minimal maintenance.The objective of this paper is to describe the current research on modelling tools for estimation of long term performance of EES and physical experiments of EES hydraulic behaviour.