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mLine 4:
Line 4: − + − | 1 + + − | colspan="2" |75 ± 25 mm − | 0.3 − + + Line 30:
Line 30: − + − | 0.4 + − + − | 0.4 +
no edit summary
|-
|-
! Component
! Component
! Typical Void ratio
! Typical void ratio (''V<sub>r</sub>'')
! Recommended depth (with underdrain pipe)
! Recommended depth (with underdrain pipe)
! Recommended depth (no underdrain pipe)
! Recommended depth (no underdrain pipe)
|-
|-
| Ponding depth
| Ponding depth
| 300 mm
| 300 mm
| See below
| See below
| 1
|-
|-
| [[Mulch]]
| [[Mulch]]
| colspan="2" |75 ± 25 mm
|
|
* 0.7 for wood based
* 0.7 for wood based
* 0.4 for aggregates
* 0.4 for aggregates
|-
|-
| [[Biofiler media]]
| [[Biofiler media]]
| colspan="2" |
| colspan="2" |
* 300 mm to support turf grass and accept only roof runoff
* 300 mm to support turf grass (and accept only rainwater/roof runoff)
* 600 mm to support flowering [[perennials]] and decorative [[grasses]]
* 600 mm to support flowering [[perennials]] and decorative [[grasses]]
* 1000 mm to support [[trees]]
* 1000 mm to support [[trees]]
| 0.3
|-
|-
| [[choker gravel|Choker course]]
| [[choker gravel|Choker course]]
| colspan="2" |100 mm
| colspan="2" |100 mm
|-
|-
| Embedding reservoir
| Pipe reservoir
| Is equal to underdrain pipe diameter
| Is equal to underdrain pipe diameter
| Not applicable
| Not applicable
| 0.4
|-
|-
| Storage reservoir
| Storage reservoir
| See below
| See below
| See below
| See below
| 0.4
|}
|}