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→Determine the required surface area of the practice
*d<sub>p</sub>' = Design surface ponding depth (m)
*d<sub>p</sub>' = Design surface ponding depth (m)
*f<sub>f, min</sub> = minimum acceptable infiltration rate (i.e. saturated hydraulic conductivity) of the filter media (m/h), see [[Bioretention: Filter media|Filter media]] for guidance}}<br>
*f<sub>f, min</sub> = minimum acceptable infiltration rate (i.e. saturated hydraulic conductivity) of the filter media (m/h), see [[Bioretention: Filter media|Filter media]] for guidance}}<br>
<br>
For practices where flow is delivered directly to the storage reservoir:
For practices where flow is delivered directly to the storage reservoir:
<math>A_{p}=i\times D\times A_{i}/[d_{i} + (f' \times D)]</math>
<math>A_{p}=i\times D\times A_{i}/[d_{i} + (f' \times D)]</math>