Difference between revisions of "Swales"
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| − | This article is about | + | This article is about installations designed to capture and convey surface runoff along a vegetated channel. |
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<div class="col-md-8"> | <div class="col-md-8"> | ||
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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. <br> | |
| − | <p>Swales are linear landscape features consisting of a drainage channel with gently sloping sides. Underground they | + | <ul> |
| − | + | <li><strong>Bioswales</strong> are sometimes referred to as 'dry swales', 'vegetated swales', 'water quality swales' or 'inline bioretention'. | |
| + | <li><strong>Enhanced Grass Swales</strong> are an alternative with lower maintenance requirements, but generally lower stormwater mangement potential. </li> | ||
| + | </ul> | ||
</p> | </p> | ||
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<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'><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 encouraged with check dams</td></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>Biomedia required</td><td>Amendment preferable when possible</td></tr> | <tr><td>Engineered soil</td><td>Biomedia required</td><td>Amendment preferable when possible</td></tr> | ||
| − | <tr><td> | + | <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>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>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> | <tr><td>Biodiversity benefit</td><td>Increased with native planting</td><td>Lower</td></tr> | ||
| + | </table> | ||
<p><strong>The fundamental components of a swale are:</strong> | <p><strong>The fundamental components of a swale are:</strong> | ||
Revision as of 20:01, 22 June 2017
This article is about installations designed to capture and convey surface runoff along a vegetated channel.
Overview[edit]
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.
- Bioswales are sometimes referred to as 'dry swales', 'vegetated swales', 'water quality swales' or 'inline bioretention'.
- Enhanced Grass Swales are an alternative with lower maintenance requirements, but generally lower stormwater mangement potential.
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
| Property | Bioswale | Enhanced Grass Swale |
|---|---|---|
| Surface water | Minimal Any surface flow can be slowed with check dams | Ponding is encouraged with check dams |
| Engineered soil | Biomedia required | Amendment preferable when possible |
| Underdrain | Common | Uncommon |
| Maintenance | Medium to high | Low |
| Stormwater benefit | High | Medium |
| Biodiversity benefit | Increased with native planting | Lower |
The fundamental components of a swale are:
- graded channel
- planting
Additional components may include:
- Biomedia - an engineered soil mix
- Planting
- Underdrain with clean out and inspection ports
- Impermeable membrane to prevent infiltration to soils below
- Check dams
<panelSuccess>
Bioswale?
</panelSuccess>
Planning Considerations[edit]
Planning Content
<panelSuccess>
Placeholder.
</panelSuccess>
Design[edit]
Design Content
<panelSuccess>
Bioretention cell capturing and treating runoff from adjacent parking lot at the Kortright Centre, Vaughan.
</panelSuccess>
Performance[edit]
Performance Content
<panelSuccess>
Placeholder
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Incentives and Credits[edit]
In Ontario
City of Mississauga
The City of Mississauga has a stormwater management credit program which includes RWH as one of their recommended site strategies[1].
LEED BD + C v. 4
SITES v.2
See Also[edit]
External Links[edit]
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