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*[[Liner|Impermeable membrane]], to prevent infiltration to soils below
*[[Liner|Impermeable membrane]], to prevent infiltration to soils below
*[[Turf reinforcement]], to prevent scour
*[[Turf reinforcement]], to prevent scour
==Planning considerations==
==Design==
==Design==
Swales should be designed to meet the following criteria:
*Minimum residence time of 5 minutes.
*Minimum residence time of 5 minutes.
*Maximum flow velocity 0.3 m/s
*Maximum flow velocity 0.3 m/s
*Bottom width between 0.6 - 2.4 m
*Bottom width between 0.6 - 2.4 m
*Minimum length 30 m
*Minimum length 30 m
{|class="wikitable"
{|class="wikitable"
|+ Slope variations
|+ Slope variations
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||5 %||Check dams required to reduce effective slope to 2 – 3 %
||5 %||Check dams required to reduce effective slope to 2 – 3 %
|}
|}
Maximum depth of flow
Maximum depth of flow
{{plainlist|
{{plainlist|
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*33% height of vegetation for infrequently mown swales.
*33% height of vegetation for infrequently mown swales.
|}}
|}}
<h3>Materials</h3>