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|-
|-
! Component
! Component
! Void ratio
! Typical Void ratio
! Recommended depth (with underdrain pipe)
! Recommended depth (with underdrain pipe)
! Recommended depth (no underdrain pipe)
! Recommended depth (no underdrain pipe)
|-
|-
| [[Biofiler media]]
| [[Biofiler media]]
| 0.3 typical
| 0.3
| colspan="2" |
| colspan="2" |
* 300 mm to support turf grass and accept only roof runoff
* 300 mm to support turf grass and accept only roof runoff