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This article is about planted installations designed to capture and filter surface runoff through an engineered soil (biomedia) to underground infrastructure. <br>

This article is about planted installations designed to capture and filter surface runoff through an engineered soil (biomedia) to underground infrastructure.

For simpler, residential systems, see [[Rain gardens]]. <br>

<br> For simple systems (typically without regulatory control), see [[Rain gardens]].

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

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

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===Overview===

===Overview===

 

    <p>Bioretention cells are one of the most well recognized form of Low Impact Development. They can encompass all mechanisms of action: infiltration, filtration and evapotranspiration.

<p>Bioretention cells are one of the most well recognized form of Low Impact Development. They can encompass all mechanisms of action: infiltration, filtration and evapotranspiration.

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{{TextBox|1=Bioretention cells are an ideal technology for:  

{{TextBox|1=Bioretention cells are an ideal technology for:  

*Fitting functional vegetation into urban landscapes

*Fitting functional vegetation into urban landscapes  

*Treating runoff collected from nearby impervious surfaces}}

*Treating runoff collected from nearby impervious surfaces}}

 

    <p><strong>The fundamental components of a bioretention cell are:</strong>  

<p><strong>The fundamental components of a bioretention cell are:</strong>

*[[Biomedia]]: An engineered soil mix  

*Biomedia: An engineered soil mix

*Planting  

*Planting  

*Storage layer of coarse aggregate

*Storage layer of [[Reservoir_gravel|coarse aggregate]]

<strong>Additional components may include:</strong>

        <strong>Additional components may include:</strong>  

*Under-drain to redistribute or remove excess water  

*[[Underdrain]] to redistribute or remove excess water  

*Impermeable membrane to prevent infiltration to soils below

*[[Liner|Impermeable membrane]] to prevent infiltration to soils below

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        <gallery mode="packed" widths=300px heights=300px>

<gallery mode="packed" widths=300px heights=300px>

            Edwards Gardens Bio 2014.JPG| These bioretention cells at Edwards Gardens in Toronto receive inflow from hydraulically connected permeable paving.

Edwards Gardens Bio 2014.JPG| These bioretention cells at Edwards Gardens in Toronto receive inflow from hydraulically connected permeable paving.

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