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→Determine the required surface area of the practice
*f' = design infiltration rate of the underlying native soil (m/h)
*f' = design infiltration rate of the underlying native soil (m/h)
*D = Design storm duration (h)}}<br>
*D = Design storm duration (h)}}<br>
* Step 11: Compare required surface area of the practice to available space.<br>
To decrease A<sub>p</sub>, consider increasing ponding depth if feasible and would not create a safety hazard, or decreasing catchment impervious area.
* Step 12: Calculate catchment impervious area to practice permeable (footprint) area ratio, R and compare to recommended range in the table above
<math>R=A_{i}/A_{p}</math>
==Calculate peak flow rates==
==Calculate peak flow rates==