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→Determine the required surface area of the practice
* Step 7: Calculate catchment impervious area to practice permeable (footprint) area ratio, R, also referred to as I/P ratio:
* Step 7: Calculate catchment impervious area to practice permeable (footprint) area ratio, R, also referred to as I/P ratio:
<math>R=A_{i}/A_{p}</math><br>
<math>R=A_{i}/A_{p}</math><br>
Adjust either d<sub>i</sub> and A<sub>p</sub>, or A<sub>i</sub> to keep R between 5 and 20.
Adjust A<sub>p</sub> or A<sub>i</sub> to keep R between 5 and 20.
==Determine the required surface area of the storage reservoir==
==Determine the required surface area of the storage reservoir==