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→Planning Considerations
[[File:Bioswale.png||thumb|Bioswale with check dams<br> (vertical scale exaggerated)]]
[[File:Bioswale.png||thumb|Bioswale with check dams<br> (vertical scale exaggerated)]]
[[File:Stepped cells.png||thumb|Stepped bioretention cells alternative for slopes >6 % <br> (vertical scale exaggerated)]]
[[File:Stepped cells.png||thumb|Stepped bioretention cells alternative for slopes >6 % <br> (vertical scale exaggerated)]]
Enhanced swales and in some cases bioswales include check dams that can be designed to pond substantial volumes of water on the swale surface between flow events, so provide both stormwater conveyance and infiltration functions.
For information about constraints to infiltration practices, and approaches and tools for identifying and designing within them see [[Infiltration]].
A linear design (surface area typically >2:1 length:width) is a common feature of swales:
A linear design (surface area typically >2:1 length:width) is a common feature of swales:
*An absolute minimum width of 0.6 m is required for bioswales to promote healthy plant growth, and to facilitate construction,
*An absolute minimum width of 0.6 m is required for bioswales to promote healthy plant growth, and to facilitate construction,