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*''K<sub>m</sub>'' is the hydraulic conductivity of the filter media (mm/hr),  
 
*''K<sub>m</sub>'' is the hydraulic conductivity of the filter media (mm/hr),  
 
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),  
 
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),  
*''Σ h'' is the total depth of bioretention components over the perforated pipe (m) (e.g. ponding/[[mulch]]/[[filter media]]/[[choker layer]]), and
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*''Σ h'' is the total head of water within bioretention components over the perforated pipe (m) (i.e. ponding + [[mulch]] + [[filter media]] + [[choker layer]]), and
 
*''d<sub>m</sub>'' is the depth of the filter media (m).  
 
*''d<sub>m</sub>'' is the depth of the filter media (m).  
 
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