Difference between revisions of "Enhanced grass swales"

Latest revision as of 14:23, 12 March 2018

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-This article is about installations designed to capture and convey surface runoff along a vegetated channel, whilst also promoting infiltration. <br>
+#REDIRECT [[Enhanced swales]]
-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
-==Design==
-*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
-/3 height of vegetation for infrequently mown swales.
-½ height of grass for regularly mown swales, to maximum of 75 mm.