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| ===Overview=== | | ===Overview=== |
| <p>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:<br> | | <p>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: |
| <strong>Bioswales</strong> are sometimes referred to as 'dry swales', 'vegetated swales', 'water quality swales' or 'inline bioretention'. 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 )<br> | | <br><strong>Bioswales</strong> 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 ) |
| <strong>Enhanced Grass Swales</strong> 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. | | <br><strong>Enhanced Grass Swales</strong> 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. |
| </p> | | </p> |
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| {{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 *Connecting with one or more other types of LID}} |
| *Sites with long linear landscaped areas, such as parking lots | |
| *Connecting with one or more other types of LID}} | |
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| <table class = "table-responsive" table class = "table table-striped"> | | <table class="table-responsive" table class="table table-striped"> |
| <caption><strong>Types of Swales</strong></caption> | | <caption><strong>Types of Swales</strong></caption> |
| <tr class ='success'><th>Property</th><th>Bioswale</th><th>Enhanced Grass Swale</th></tr> | | <tr class='success'> |
| <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> | | <th>Property</th> |
| <tr><td>Engineered soil</td><td>Biomedia required</td><td>Amendment preferable when possible</td></tr> | | <th>Bioswale</th> |
| <tr><td>Underdrain</td><td>Common</td><td>Uncommon</td></tr> | | <th>Enhanced Grass Swale</th> |
| <tr><td>Maintenance</td><td>Medium to high</td><td>Low</td></tr> | | </tr> |
| <tr><td>Stormwater benefit</td><td>High</td><td>Medium</td></tr> | | <tr> |
| <tr><td>Biodiversity benefit</td><td>Increased with native planting</td><td>Lower</td></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>Biomedia 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> | | </table> |
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| <p><strong>The fundamental components of a swale are:</strong> | | <p><strong>The fundamental components of a swale are:</strong> |
| <ul> | | <ul> |
| <li>Graded channel</li> | | <li>Graded channel</li> |
| <li>Planting</li> | | <li>Planting</li> |
| </ul> | | </ul> |
| <strong>Additional components may include:</strong> | | <strong>Additional components may include:</strong> |
| <ul> | | <ul> |
| <li>[[Biomedia]] - an engineered soil mix</li> | | <li>[[Biomedia]] - an engineered soil mix</li> |
| <li>[[Underdrain]] with clean out and inspection ports</li> | | <li>[[Underdrain]] with clean out and inspection ports</li> |
| <li>[[Liner|Impermeable membrane]] to prevent infiltration to soils below</li> | | <li>[[Liner|Impermeable membrane]] to prevent infiltration to soils below</li> |
| <li>[[Turf reinforcement]] to prevent scour</li> | | <li>[[Turf reinforcement]] to prevent scour</li> |
| <li>Check dams</li> | | <li>Check dams</li> |
| </ul> | | </ul> |
| </p> | | </p> |
| </div> | | </div> |
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| <div class="col-md-4"> | | <div class="col-md-4"> |
| <panelSuccess> | | <panelSuccess> |
| <gallery mode="packed" widths=300px heights=300px> | | <gallery mode="packed" widths=300px heights=300px> |
| 20161024 100338 550x550.jpg| Bioswale? | | 20161024 100338 550x550.jpg| Bioswale, County Court Boulevard, Brampton |
| </gallery> | | </gallery> |
| </panelSuccess> | | </panelSuccess> |
| </div> | | </div> |
| <div class="col-md-12"> | | <div class="col-md-12"> |