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While few field studies of the pollutant removal capacity of bioswales are available from cold climate regions like Ontario, it can be assumed that they would perform similar to [[bioretention cells]].

While few field studies of the pollutant removal capacity of bioswales are available from cold climate regions like Ontario, it can be assumed that they would perform similar to [[bioretention cells]].

Bioretention provides effective removal for many pollutants as a result of sedimentation, filtering, plant uptake, soil adsorption, and microbial processes. It is important to note that there is a relationship between the water balance and water quality functions.

Bioretention provides effective removal for many pollutants as a result of sedimentation, filtering, plant uptake, soil adsorption, and microbial processes. It is important to note that there is a relationship between the water balance and water quality functions.

If a bioswale infiltrates and evaporates 100% of the flow from a site, then there is essentially no pollution leaving the site in surface runoff.  Furthermore, treatment of infiltrated runoff will continue to occur as it moves through the native soils. </p>

If a bioswale infiltrates and evaporates 100% of the flow from a site, then there is essentially no pollution leaving the site in surface runoff.  Furthermore, treatment of infiltrated runoff will continue to occur as it moves through the native soils.  

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!Design

!Design

|colspan="2"|<strong>Runoff reduction estimate</strong>||<strong>85 %</strong>

|colspan="2"|<strong>Runoff reduction estimate</strong>||<strong>85 %</strong>

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