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Line 1: − This article is about installations designed to capture and convey surface runoff along a vegetated channel, whilst also promoting infiltration. <br>+ − For underground conveyance which promotes infiltration, see [[Exfiltration trenches]].<br> − For conveyance along planted channels, on both surface and underground, see [[Bioswales]]. − {{TOClimit|2}} − ==Overview== − '''The fundamental components of an enhanced grassed swale are:''' − *Graded channel − *[[Grasses| Resilient turf grass]] − *[[Check dams]], to facilitate short term ponding − '''Additional components may include:''' − *[[Absorbent landscapes| Amended soil]], to increase infiltration to soils below − *[[Liner|Impermeable membrane]], to prevent infiltration to soils below − *[[Turf reinforcement]], to prevent scour − − ==Planning considerations== − − ===Check dams=== − {{:Check dams}} − − ==Design== − Swales should be designed to meet the following criteria: − *Minimum residence time of 5 minutes. − *Maximum flow velocity 0.3 m/s − *Bottom width between 0.6 - 2.4 m − *Minimum length 30 m − {|class="wikitable" − |+ Slope variations − |- − |< 2 %||Use underdrain to distribute water for infiltration − |- − |2 - 5 %||Design swale for surface flow, consider check dams − |- − ||5 %||Check dams required to reduce effective slope to 2 – 3 % − |} − Maximum depth of flow − {{plainlist| − *50% height of grass for regularly mown swales, to maximum of 75 mm. − *33% height of vegetation for infrequently mown swales. − |}} − − <h3>Modeling</h3> − {{:Swales: TTT}} − − <h3>Materials</h3>
Redirected page to Enhanced swales
#REDIRECT [[Enhanced swales]]