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→Pollutant removal capacity
Drainage Systems. Executive Summary. Prepared for the Infrastructure Management
Drainage Systems. Executive Summary. Prepared for the Infrastructure Management
Division of the City of Ottawa. Ottawa, Ontario.</ref>. The Nepean systems were shown to release significantly less pollutants than the conventional sewer system, even after 20 years of operation<ref name=Sabourin/>.
Division of the City of Ottawa. Ottawa, Ontario.</ref>. The Nepean systems were shown to release significantly less pollutants than the conventional sewer system, even after 20 years of operation<ref name=Sabourin/>.
{| class="wikitable sortable"
|+Pollutant removal efficiencies of vegetated filter strips
|-
!Practice
!Location
!Lead %
!Copper %
!Zinc %
![[Total suspended solids]] (TSS) %
!Total [[Phosphorus]] %
!Total [[Nitrogen]] (TKN) %
|-
|Soakaway||Valence, France<ref></ref>||98||-||54 - 88||-||-||-
|-
|[[Infiltration trench]]||Various<ref></ref>||70 - 90||70 - 90||70 - 90||70 - 90||50 - 70||40 - 70
|-
|Grass swale/perforated pipe||North York, ON<ref></ref>||75||96||93||24||84||84
|-
|Grass swale/perforated pipe||Nepean, ON<ref></ref>||- 99||66||0||81||81||72
|-
|grass swale/perforate pipe||Nepean, ON<ref></ref>||> 99||> 99||90||96||93||93
|}
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