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*Layers of [[Reservoir_gravel|coarse aggregate]] to bed the chambers and redistribute water.
*Layers of [[Reservoir_gravel|coarse aggregate]] to bed the chambers and redistribute water.
*[[Pipes|Perforated pipe]]
*[[Pipes|Perforated pipe]]
{| class="wikitable"
{| class="wikitable"
! System type !! Pipe !! Vaults !! Arched chambers !! Crates
! System type
! Pipe
! Vaults
! Arched chambers
! Crates
|-
|-
| Materials || Plastic || Concrete || Plastic/concrete || Plastic
| Materials || Plastic || Concrete || Plastic/concrete || Plastic