Changes

===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:

<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>

<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>

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<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>

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        <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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