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Hydraulically separated or connected with an underdrain, these are often quite small units of 5 - 50 m² each. In urban settings the bioretention cell may be bounded entirely with hardscape, restricting options for pretreatment and sheet flow. Amenity and safety can be enhanced on sidewalks with a short (~ 45 cm wall) for seating, although the finished grade is usually only slightly lower than surroundings.  Where underground space permits, shade trees are common feature of these facilities, enhancing the streetscape experience and optimizing transpiration. This type of bioretention is often [[Bioretention: Routing|designed offline]], with bypass overflow.  

Hydraulically separated or connected with an [[underdrain]], these are often quite small units of 5 - 50 m² each. In urban settings the bioretention may be bounded entirely with hardscape, restricting options for [[pretreatment]] and sheet flow. Amenity and safety can be enhanced on sidewalks with a short (~ 45 cm wall) for seating, although the finished grade is usually only slightly lower than surroundings.  Where underground space permits, shade [[trees]] are common feature of these facilities, enhancing the streetscape experience and optimizing transpiration. This type of bioretention is often designed offline, with bypass [[overflow]].  

An excellent opportunity for integrating more bioretention into the street is through careful design of curb extensions for traffic control.

An excellent opportunity for integrating more bioretention into the street is through careful design of curb extensions for traffic control.

*[[Bioretention:_Filter_media|Filter media]]

*[[Bioretention:_Filter_media|Filter media]]

*[[Choking layer]]

*[[Choking layer]]

*[[Reservoir_gravel|Reservoir]]

*[[Reservoir_aggregate|Reservoir]]