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| 0.4 for clear stone aggregate in which the pipe is embedded
| 0.4 for clear stone aggregate in which the pipe is embedded
|-
|-
| Storage reservoir (''d<sub>r</sub>'')
| [[Bioretention: Internal water storage|Internal Water Storage reservoir]] (''d<sub>r</sub>'')
| See below
| See below
| See below
| See below
You can use the infiltration practice sizing tool noted above to adjust d<sub>p</sub>, d<sub>i</sub>, A<sub>p</sub> or A<sub>i</sub> to find practice dimensions that provide the required storage volume and will drain within the specified drainage time, while keeping R between 5 and 20.
You can use the infiltration practice sizing tool noted above to adjust d<sub>p</sub>, d<sub>i</sub>, A<sub>p</sub> or A<sub>i</sub> to find practice dimensions that provide the required storage volume and will drain within the specified drainage time, while keeping R between 5 and 20.
==Determine the required surface area of the storage reservoir==
==Determine the required surface area of the internal water storage (IWS) reservoir==
* Step 8: Calculate the surface area of the storage reservoir, A<sub>r</sub> (m<sup>2</sup>) needed to capture the infiltration volume target for the design storm event: <math>A_{r}=V_{i}/[d_{i}+(f'\times D)]</math>
* Step 8: Calculate the surface area of the storage reservoir, A<sub>r</sub> (m<sup>2</sup>) needed to capture the infiltration volume target for the design storm event: <math>A_{r}=V_{i}/[d_{i}+(f'\times D)]</math>
{{Plainlist|1= Where:
{{Plainlist|1= Where: