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* Step 3: Select a design surface ponding depth, d<sub>p</sub>' (m) to begin sizing with:<br>
* Step 3: Select a design surface ponding depth, d<sub>p</sub>' (m) to begin sizing with:<br>
For practices with soft (i.e. landscaped) edges and bowl-shaped ponding areas calculate the mean surface ponding depth:
For practices with soft (i.e. landscaped) edges and bowl-shaped ponding areas calculate the mean surface ponding depth:
<math>d_{p}'=d_{p, max}\times 1/2</math><br>
<math>d_{p}'=d_{p, max}\times 1/2</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*d<sub>p, max</sub> = maximum surface ponding depth (m)}}<br>
*d<sub>p, max</sub> = maximum surface ponding depth (m)}}<br>
For practices with hard edges and vertical-walled ponding areas (e.g., stormwater planter, soil cell) use the maximum ponding depth:
For practices with hard edges and vertical-walled ponding areas (e.g., stormwater planter, soil cell) use the maximum ponding depth:
<math>d_{p}'=d_{p, max}</math>
<math>d_{p}'=d_{p, max}</math>
==Determine the required surface area of the practice==
* Step 4: Calculate the surface (i.e footprint) area of the practice (A<sub>p</sub>) needed to capture runoff produced from the catchment during the design storm event:<br>
For practices where flow is delivered to the filter media bed:
<math>A_{p}=i\times D\times A_{i}/((d_{a} + (f_{m, min} \times D))
{{Plainlist|1=Where:
*i = Design storm intensity (mm/h)
*D = Design storm duration (h)
*A<sub>i</sub> = Catchment impervious area (m<sup>2</sup>)
*f<sub>m, min</sub> = minimum infiltration rate of the filter media (mm/h)
==Determine the active storage depth of the practice==
==Determine the active storage depth of the practice==