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*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 surface ponding area
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*A surface ponding area
*a 'filter bed' containing a [[Bioretention: Filter media| filter media]]
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*A filter bed containing a [[Bioretention: Filter media| filter media]]
*a water storage layer of [[reservoir aggregate]]
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*A water storage layer of [[reservoir aggregate]]
*[[Plant lists|plants]], and  
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*[[Plant lists|Plants]], and  
*a finishing surface layer (e.g. [[mulch]] and/or [[stone]])
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*A filter bed surface cover layer (e.g. [[mulch]] and/or [[stone]])
 
'''Additional components may include:'''  
 
'''Additional components may include:'''  
*an [[underdrain]] to redistribute or remove excess water
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*An [[underdrain]] to redistribute or remove excess water
*soil [[additives]] intended to enhance nutrient and related water quality pollutant removal
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*Filter media [[additives]] intended to enhance nutrient and related water quality pollutant removal
    
==Planning considerations==
 
==Planning considerations==

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