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| This article is about installations designed to capture and convey surface runoff along a vegetated channel, whilst also promoting infiltration. <br> | | This article is about installations designed to capture and convey surface runoff along a vegetated channel, whilst also promoting infiltration. <br> |
| For underground conveyance which promotes infiltration, see [[Exfiltration trenches]]. | | For underground conveyance which promotes infiltration, see [[Exfiltration trenches]]. <br> |
| For design recommendations on grassed channels, see [[Enhanced grass swales]]. | | For design recommendations on grassed channels, see [[Enhanced grass swales]]. |
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| <p><strong>The fundamental components of a swale are:</strong> | | ===Overview=== |
| | <p><strong>The fundamental components of a bioswale are:</strong> |
| <ul> | | <ul> |
| <li>Graded channel</li> | | <li>A graded channel</li> |
| <li>Planting</li> | | <li>Planting</li> |
| | <li>[[Bioretention: Filter media | Filter media]], to permit infiltration into the facility (not necessarily to soils below)</li> |
| </ul> | | </ul> |
| <strong>Additional components may include:</strong>
| | <strong>Additional components may include:</strong> |
| <ul> | | <ul> |
| <li>[[Filter media]] - 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>[[Check dams]] to facilitate short tern ponding</li> | | <li>[[Check dams]] to facilitate short tern ponding</li> |
| </ul> | | </ul> |
| </p> | | </p> |