Bioretention cells should be sized to accommodate runoff from approximately 5 to 20 times the footprint area of the facility. i.e. I:P ratio of 5 to 20.
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If additional storage volume is desired beneath an underdrain pipe, this may be sized as an [[Infiltration:_Sizing_and_modeling|infiltration trench]].
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[[Bioretention:_Sizing_and_modeling]]
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If additional storage volume is desired beneath an underdrain pipe, this may be sized as an [[Infiltration:_Sizing_and_modeling|infiltration trench]].