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→Determine the required surface area of the practice
* Step 11: Compare required surface area of the practice to available space.<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.
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:
* Step 12: Calculate catchment impervious area to practice permeable (footprint) area ratio:
<math>R=A_{i}/A_{p}</math>
<math>R=A_{i}/A_{p}</math><br>
Adjust either A<sub>i</sub> or A<sub>p</sub> to keep R between 5 and 20.
==Calculate peak flow rates==
==Calculate peak flow rates==