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Line 24: + + + + + + − − <table class="table-responsive" table class="table table-striped"> − <caption><strong>Types of Swales</strong></caption> − <tr class='success'> − <th>Property</th> − <th>Bioswale</th> − <th>Enhanced Grass Swale</th> − </tr> − <tr> − <td>Surface water</td> − <td>Minimal − <br>Any surface flow can be slowed with check dams</td> − <td>Ponding is encouraged with check dams</td> − </tr> − <tr> − <td>Engineered soil</td> − <td>Filter media required</td> − <td>Amendment preferable when possible</td> − </tr> − <tr> − <td>Underdrain</td> − <td>Common</td> − <td>Uncommon</td> − </tr> − <tr> − <td>Maintenance</td> − <td>Medium to high</td> − <td>Low</td> − </tr> − <tr> − <td>Stormwater benefit</td> − <td>High</td> − <td>Medium</td> − </tr> − <tr> − <td>Biodiversity benefit</td> − <td>Increased with native planting</td> − <td>Lower</td> − </tr> − </table> − </div> − <div class="col-md-4"> − <panelWarning> − <gallery mode="packed" widths=300px heights=300px> − 20161024 100338 550x550.jpg| Bioswale, County Court Boulevard, Brampton − </gallery> − </panelWarning> − </div> − <div class="col-md-12"> −
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This article is about installations designed to capture and convey surface runoff along a vegetated channel, whilst also promoting infiltration. <br>
This article is about installations designed to capture and convey surface runoff along a vegetated channel, whilst also promoting infiltration. <br>
For underground conveyance which promotes infiltration, see [[Exfiltration trenches]].
For underground conveyance which promotes infiltration, see [[Exfiltration trenches]].
==Overview==
==Overview==
[[File:20161024 100338 550x550.jpg|thumb|Bioswale, County Court Boulevard, Brampton]]
[[File:20161024 100338 550x550.jpg|thumb|Bioswale, County Court Boulevard, Brampton]]
Swales are linear landscape features consisting of a drainage channel with gently sloping sides. Underground they may be filled with engineered soil and/or contain a water storage layer of coarse gravel material. Two variations on a basic swale are recommended as low impact development strategies, although using a combination design of both may increase the benefits:
Swales are linear landscape features consisting of a drainage channel with gently sloping sides. Underground they may be filled with engineered soil and/or contain a water storage layer of coarse gravel material. Two variations on a basic swale are recommended as low impact development strategies, although using a combination design of both may increase the benefits:
*[[Bioswales]] are sometimes referred to as 'dry swales', 'vegetated swales', or 'water quality swales'. This type of structure is similar to a [[Bioretention cells|bioretention cell]] but with a long linear shape (surface area typically >2:1 length:width )
*[[Bioswales]] are sometimes referred to as 'dry swales', 'vegetated swales', or 'water quality swales'. This type of structure is similar to a [[Bioretention cells|bioretention cell]] but with a long linear shape (surface area typically >2:1 length:width )
*[[Enhanced grass swales]] are a lower maintenance alternative, but generally have lower stormwater management potential. The enhancement over a basic grass swale is in the addition of check dams to slow surface water flow and create small temporary pools of water which can infiltrate the underlying soil.
*[[Enhanced grass swales]] are a lower maintenance alternative, but generally have lower stormwater management potential. The enhancement over a basic grass swale is in the addition of check dams to slow surface water flow and create small temporary pools of water which can infiltrate the underlying soil.
{{TextBox|1=Swales are an ideal technology for:
{{TextBox|1=Swales are an ideal technology for:
*Sites with long linear landscaped areas, such as parking lots
*Sites with long linear landscaped areas, such as parking lots
*Connecting with one or more other types of LID}}
*Connecting with one or more other types of LID}}
{| class="wikitable"
{| class="wikitable"
|+ Types of Swale
|+ Types of Swale
!Underdrain
!Underdrain
|Common||Uncommon
|Common||Uncommon
!Maintenance
|Medium to high||Low
!Stormwater benefit
|High||Moderate
!Biodiversity benefit
|Increased with native planting||Typically lower
|}
|}
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==Planning Considerations==
==Planning Considerations==
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