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Line 8:
*[[Grasses| Resilient turf grass]]
*[[Grasses| Resilient turf grass]]
*[[Check dams]], to facilitate short term ponding
*[[Check dams]], to facilitate short term ponding
−'''Additional components may include:'''
'''Additional components may include:'''
*[[Absorbent landscapes| Amended soil]], to increase infiltration to soils below
*[[Absorbent landscapes| Amended soil]], to increase infiltration to soils below
*[[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
+
+==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
+1/3 height of vegetation for infrequently mown swales.
+½ height of grass for regularly mown swales, to maximum of 75 mm.