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| ===Planning Considerations=== | | ===Planning Considerations=== |
| <div class="col-md-8"> | | <div class="col-md-8"> |
| <ul>
| | A linear design (surface area typically >2:1 length:width) is a common feature of a swales: |
| <li>Although linear design (surface area typically >2:1 length:width) is a feature of a swale, an absolute minimum width is 0.6 m is required for bioswales to have healthy plant growth, and to facilitate construction. </li>
| | <ul> |
| <li>Grassed swales are usually mown as part of routine maintenance, so the cross section will be parabolic or trapzoidal in shape. The minimum width for this type is 2 m. </li> | | <li>An absolute minimum width is 0.6 m is required for bioswales to have healthy plant growth, and to facilitate construction. </li> |
| <li>Swales may be graded along longitudinal slopes between 0.5 - 6 %.</li> | | <li>Grassed swales are usually mown as part of routine maintenance, so the cross section will be parabolic or trapzoidal in shape. The minimum width for this type is 2 m. </li> |
| <ul> | | </ul> |
| <li>Check dams are required on slopes > 3 %. </li> | | Swales may be graded along longitudinal slopes between 0.5 - 6 %: |
| <li>Slopes > 6% can accommodate a series of stepped [[bioretention cells]], each overflowing with a weir, into the next. </li> | | <ul> |
| </ul>
| | <li>Check dams are required on slopes > 3 %. </li> |
| </ul> | | <li>Slopes > 6% can accommodate a series of stepped [[bioretention cells]], each overflowing with a weir, into the next. </li> |
| | </ul> |
| </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> |
| Bioswale.png| Bioswale with check dams, vertical scale exaggerated. | | Bioswale.png| Bioswale with check dams, vertical scale exaggerated. |
| Stepped cells.png| The stepped cells alternative for slopes > 6 %. | | Stepped cells.png| Stepped cells alternative for slopes > 6 %. |
| </gallery> | | </gallery> |
| </panelSuccess> | | </panelSuccess> |
| </div> | | </div> |
| <div class="col-md-12"> | | <div class="col-md-12"> |
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