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! Typical void ratio (''V<sub>R</sub>'')
! Typical void ratio (''V<sub>R</sub>'')
|-
|-
| Ponding depth
| Ponding depth (d<sub>p</sub>)
| 300 mm
| 300 mm
| See below
| See below
|
|
* 0.7 for wood based
* 0.7 for wood based
* 0.4 for aggregates
* 0.4 for aggregate
|-
|-
| [[Bioretention media]]
| [[Bioretention media]] (d<sub>m</sub>)
| colspan="2" |
| colspan="2" |
* 300 mm to support turf grass (and accept only rainwater/roof runoff)
* 300 mm to support turf grass (and accept only rainwater/roof runoff)
| 0.4
| 0.4
|-
|-
| Storage reservoir
| Storage reservoir (d<sub>s</sub>)
| See below
| See below
| See below
| See below