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→Determine the required surface area of the practice
*K<sub>f</sub> = minimum acceptable saturated hydraulic conductivity of the filter media (m/h), see [[Bioretention: Filter media|Filter media]] for guidance}}<br>
*K<sub>f</sub> = minimum acceptable saturated hydraulic conductivity of the filter media (m/h), see [[Bioretention: Filter media|Filter media]] for guidance}}<br>
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For practices where flow is delivered directly to the storage reservoir:
For practices where flow is delivered directly to a subsurface (underground) water 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>
{{Plainlist|1=Where:
{{Plainlist|1=Where: