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{{TOClimit|2}} They are sometimes referred to as 'dry swales', 'vegetated swales', 'water quality swales' or 'inline bioretention'.
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This article is about planted installations designed to capture <strong>and convey</strong> surface runoff through an engineered soil with subterranean infrastructure.
This article is about installations designed to capture and convey surface runoff along a vegetated channel.
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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 are filled with engineered soil and a water storage layer of coarse gravel material. <br>
<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>
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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>Udnerdrain</td><td>Common</td><td>Uncommon</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>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>