Changes

==Planning Considerations==

==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 %]]

[[File:Stepped cells.png||thumb|Stepped bioretention cells alternative for slopes >6 % <br> (vertical scale exaggerated)]]

A linear design (surface area typically >2:1 length:width) is a common feature of a swales:

A linear design (surface area typically >2:1 length:width) is a common feature of a swales:

*An absolute minimum width is 0.6 m is required for bioswales to have healthy plant growth, and to facilitate construction,

*An absolute minimum width is 0.6 m is required for bioswales to have healthy plant growth, and to facilitate construction,

*Slopes > 6% can accommodate a series of stepped [[bioretention cells]], each overflowing into the next with a weir.

*Slopes > 6% can accommodate a series of stepped [[bioretention cells]], each overflowing into the next with a weir.

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==Design==

==Design==

[[File:Check dams.png|thumb| Distance between dams is determined by equalling the elevation of the crest of each dam, with the elevation of the toe of the upstream dam. <br>(vertical scale exaggerated)]]

[[File:Check dams.png|thumb| Distance between dams is determined by equalling the elevation of the crest of each dam, with the elevation of the toe of the upstream dam. <br>(vertical scale exaggerated)]]