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The maximum flow rate through a bed of filer media (''Q<sub>max<max>'') may be calculated:
The maximum flow rate through a bed of filer media (''Q<sub>max<max>'') may be calculated:
<math>Q_{max}=3.6 \times 10^{-3}\times K_{m}\times A_{p}\times \left (\frac{d_{pd}+d_{m}}{d_{m}} \right )</math>
<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>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''K<sub>m</sub>''' is the hydraulic condcuvitiy of the filter media (mm/hr),
*''K<sub>m</sub>''' is the hydraulic conductivity of the filter media (mm/hr),
*''Aand
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>),
*''d<sub>p</sub>'' is the depth of ponding (mm),
*''d<sub>m</sub>'' is the depth of the filter media (mm), and
<math>Q_{p} = A_{p}\times K_{sat}\times </math>
<math>Q_{p} = A_{p}\times K_{sat}\times </math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''K<sub>sat</sub>'' is the saturated hydraulic conductivity of the filter media (mm/hr), and
*''K<sub>sat</sub>'' is the saturated hydraulic conductivity of the filter media (mm/hr), and
*''A<sub>p</sub>'' is the area of the practice (m<sup>2</sup>).}}
*.}}