Difference between revisions of "Swales"
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<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> | ||
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<li>Check dams</li> | <li>Check dams</li> | ||
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Revision as of 20:11, 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 a lower maintenance alternative, but generally have lower stormwater management 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
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Bioswale?
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Planning Considerations[edit]
Planning Content
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Design[edit]
Design Content
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Bioretention cell capturing and treating runoff from adjacent parking lot at the Kortright Centre, Vaughan.
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Performance[edit]
Performance Content
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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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