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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> |
| | | |
− | {{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}} | |
| | | |
− | <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> |
| | | |
| <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> |
| | | |
| <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"> |