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*Inline facilities accept all of the flow from a drainage area and convey larger event flows through an overflow outlet. The overflow must be sized to safely convey larger storm events out of the facility.
:The invert of the overflow should be placed at the maximum water surface elevation of the bioretention area, (typically 150 - 250 mm above the surface).
*The overflow must be situated at the far end of the facility to prevent any localised ponding to cause bypassing of the infiltration facility.
*Offline facilities use flow splitters or bypass channels that only allow the required water quality storage volume to enter the facility.
:Higher flows are diverted and do not enter the infiltration practice. A pipe can by used for this, but a weir or [[curb cuts|curb cut]] minimizes clogging and reduces the maintenance frequency.

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