Changes

This article is about planted installations designed to capture and infiltrate surface runoff through engineered soil ([[filter media]]).

This article is about planted installations designed to capture and infiltrate at least some part of the stormwater received.  

<br> For simple systems (typically in residential settings), see [[Rain gardens]].

<br> For simple systems, without underdrains or storage reservoir (typically found n residential settings), see [[Rain gardens]].

<br> For linear systems, which convey flow, but are otherwise similar see [[Swales|Bioswales]].

<br> For linear systems, which convey flow, but are otherwise similar to bioretention see [[Swales|Bioswales]].

<br> For similar planted systems that do not infiltrate the water, see [[Stormwater planters]]  

<br> For planted systems that do not infiltrate any water, see [[Stormwater planters]]  

[[File:Edwards Gardens Bio 2014.JPG|thumb|alt=This is alt text|These bioretention cells at Edwards Gardens in Toronto receive inflow from hydraulically connected permeable paving]]

[[File:Edwards Gardens Bio 2014.JPG|thumb|alt=This is alt text|These bioretention cells at Edwards Gardens in Toronto receive inflow from hydraulically connected permeable paving]]

[[File:IMG 2457 750X500.jpg|thumb|Bioretention cell capturing and treating runoff from adjacent parking lot at the Kortright Centre, Vaughan.]]

[[File:IMG 2457 750X500.jpg|thumb|Bioretention cell capturing and treating runoff from adjacent parking lot at the Kortright Centre, Vaughan.]]

*Treating runoff collected from nearby impervious surfaces}}

*Treating runoff collected from nearby impervious surfaces}}

'''The fundamental components of a bioretention cell are:'''

'''The fundamental components of a bioretention cell are:'''

*A 'filter bed' containing an [[Bioretention: Filter media| engineered soil mix]]

*A 'filter bed' containing an [[Bioretention: Filter media| filter media]]

*A storage layer of [[Reservoir_gravel|coarse aggregate]]

*A storage layer of [[reservoir aggregate]]

*[[Planting]] and a finishing surface layer (e.g. [[mulch]])

*[[Planting]], and  

*a finishing surface layer (e.g. [[mulch]] and/or [[stone]])

'''Additional components may include:'''  

'''Additional components may include:'''  

*An [[underdrain]] to redistribute or remove excess water  

*An [[underdrain]] to redistribute or remove excess water  

==Planning considerations==

==Planning considerations==

===Infiltration===

===Infiltration===

Some form of stormwater landscaping (bioretention) can be fitted into most spaces. One of the key decisions is whether to infiltrate all of some of the collected water into the native soil. Although there are some [[Infiltration#Constraints|constraints]] to infiltrating water, it is preferable to do so where possible. [[Bioretention:_Partial_infiltration|Partial infiltration]] facilities are a popular choice over 'tight' soils (infiltration ≤ 15 mm/hr).

Some form of stormwater landscaping (bioretention) can be fitted into most spaces. Although there are some [[Infiltration#Constraints|constraints]] to infiltrating water, it is preferable to do so where possible. [[Bioretention:_Partial_infiltration|Partial infiltration]] facilities are a popular choice over 'tight' soils where infiltration rates are ≤ 15 mm/hr.

{{:Bioretention: Variations}}

{{:Bioretention: Variations}}