Changes

<p>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. 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>

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]].

<div class="col-md-8">

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.

<table table class="table table-condensed table-striped">

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>

 

        <th class="text-center">Design</th>

{| class="orangetable"

        <th class="text-center">Location</th>

|-

        <th class="text-center">Runoff reduction</th>

!Design

!Location

!Runoff reduction

        <td class="text-center">No underdrain</td>

        <td class="text-center">Washington</td>

|No underdrain||Washington||>98 %

        <td class="text-center">98 %</td>

|No underdrain||United Kingdom||>94 %

        <td class="text-center">No underdrain</td>

|With underdrain||Maryland||46 - 54 %

        <td class="text-center">United Kingdom</td>

        <td class="text-center">94 %</td>

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

        <td class="text-center">With underdrain</td>

        <td class="text-center">Maryland</td>

        <td class="text-center">46 - 54 %</td>

        <td colspan=2 class="text-right"><strong>Runoff reduction estimate</strong></td>

        <td class="text-center"><strong>85 %</strong></td>

    </tr>