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The maximum flow rate through a bed of filter media (''Q<sub>max, m</sub>'', L/s) may be calculated:
 
The maximum flow rate through a bed of filter media (''Q<sub>max, m</sub>'', L/s) may be calculated:
<math>Q_{max, m}=\frac{K_{m}\times A_{p}\times \left (\frac{\sum h}{d_{m}}  \right )}{3600}</math>
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<math>Q_{max, m}=\frac{K_{m}\times A_{p}\times \left (\frac{h_{max}}{d_{m}}  \right )}{3600}</math>
 
{{Plainlist|1=Where:
 
{{Plainlist|1=Where:
 
*''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 head of water within bioretention components over the perforated pipe (m) (i.e. ponding + [[mulch]] + [[filter media]] + [[choker layer]]), and
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*''h<sub>max</sub>'' 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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