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→Determine the required surface area of the practice
*A<sub>i</sub> = Catchment impervious area (m<sup>2</sup>)
*A<sub>i</sub> = Catchment impervious area (m<sup>2</sup>)
*d<sub>p</sub>' = Design surface ponding depth (m)
*d<sub>p</sub>' = Design surface ponding depth (m)
*f<sub>m, min</sub> = minimum infiltration rate of the filter media (m/h), see [[Bioretention: Filter media|Filter media]] for guidance}}<br>
*f<sub>m, min</sub> = minimum infiltration rate (i.e. saturated hydraulic conductivity) of the filter media (m/h), see [[Bioretention: Filter media|Filter media]] for guidance}}<br>
For practices where flow is delivered to the storage reservoir:
For practices where flow is delivered to the storage reservoir:
<math>A_{p}=i\times D\times A_{i}/[(d_{a} + (f' \times D)]</math>
<math>A_{p}=i\times D\times A_{i}/[(d_{a} + (f' \times D)]</math>