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Many of the dimensions in a bioretention system are relatively constrained by the performance requirements of the individual component. There is greatest flexibility in the ponding depth and the depth of the storage reservoir beneath the optional underdrain pipe. The order of operations in calculating these dimensions depends on whether an underdrain is desired.
{| class="wikitable"
|-
! Component
! Void ratio
! Recommended depth (with underdrain pipe)
! Recommended depth (no underdrain pipe)
|-
| Ponding depth
| 1
| 300 mm
| See below
|-
| Mulch
|
* 0.7 for wood based
* 0.4 for aggregate based
| colspan="2" |75 ± 25 mm
|}
{{#l:RWH_DC_TOOL_v.1.4.xlsm|This file will be downloaded when clicked}}
{{#l:RWH_DC_TOOL_v.1.4.xlsm|This file will be downloaded when clicked}}