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Line 403:
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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]];
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*Keep pipe and flow restrictor free of obstructions by flushing annually;
+
*Keep pipe and flow restrictor free of obstructions by flushing as needed;
*Inspect flow restrictor frequently (e.g., biannually to quarterly).
*Inspect flow restrictor frequently (e.g., biannually to quarterly).
|[[File:Underdrain bio pass.PNG|310px|thumb|center|The perforated sub-drain pipe is not obstructed by sediment, debris or roots and shows no signs of damage.]]
|[[File:Underdrain bio pass.PNG|310px|thumb|center|The perforated sub-drain pipe is not obstructed by sediment, debris or roots and shows no signs of damage.]]