Bioretention system
The term bioretention system (or rain garden) refers to:
‘A shallow planted depression that allows runoff to pond temporarily on the surface, before filtering through vegetation and underlying soils prior to collection or infiltration. In its simplest form, it is often referred to as a rain garden. Engineered soils (gravel and sand layers) and enhanced vegetation can be used to improve treatment performance.’
Ref The SuDS Manual, CIRIA C753, 2015.
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