Optional component; [[Pipes|perforated pipe(s)]] surrounded by [[gravel]] and may be wrapped in [[Geotextile|geotextile filter fabric]]; installed below the [[filter media]] [[soil]] layer to collect and convey treated water to an adjacent drainage system; may also include a flow restrictor.
Optional component; [[Pipes|perforated pipe(s)]] surrounded by [[gravel]] and may be wrapped in [[Geotextile|geotextile filter fabric]]; installed below the [[filter media]] soil layer to collect and convey treated water to an adjacent drainage system; may also include a flow restrictor.
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*Include [[Bioretention: Sizing|standpipes]] or access points to provide means of flushing the [[perforated pipe]];
*Include [[Bioretention: Sizing|standpipes]] or access points to provide means of flushing the [[perforated pipe]];