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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>
<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
*''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).
}}
}}