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The maximum flow rate through a bed of filer media (''Q<sub>max</sub>'') may be calculated:
The maximum flow rate through a bed of filer media (''Q<sub>max</sub>'') may be calculated:
<math>Q_{max}=K_{m}\times A_{p}\times \left (\frac{d_{p}+d_{m}}{d_{m}} \right )\times 3.6 \times 10^{-3}</math>
<math>Q_{max}=K_{m}\times A_{p}\times \left (\frac{\sum d}{d_{m}} \right )\times 3.6 \times 10^{-3}</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 d<sub>z</sub>'' is the total depth of bioretention components over the perforated pipe (mm) (e.g. ponding/[[mulch]]/[[filter media]]/[[choker layer]]),
*''Σ d'' is the total depth of bioretention components over the perforated pipe (mm) (e.g. ponding/[[mulch]]/[[filter media]]/[[choker layer]]),
*''d<sub>m</sub>'' is the depth of the filter media (mm), and
*''d<sub>m</sub>'' is the depth of the filter media (mm), and
}}
}}