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Line 51: − <ul>+ − <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>+ − + + − + − + − + − + − + − + −
→Planning Considerations
===Planning Considerations===
===Planning Considerations===
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A linear design (surface area typically >2:1 length:width) is a common feature of a swales:
<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>
<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>
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<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 %.
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</gallery>
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