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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"
! System type !! Pipe !! Vaults !! Arched chambers !! Crates
|-
| Materials || Plastic || Concrete || Plastic/concrete || Plastic
|-
| Footprint || Medium || Small || Large || Small
|-
| Stackable || Not usually (can be without infiltration) || Yes || Not usually (can be without infiltration) || Yes
|-
| Onsite assembly || Some || No || Yes || Yes
|-
| Void ratio || 60-65% || 75-85% || 50-65% || 95%
|-
| Maintenance access || Moderate || Excellent || Moderate || Difficult
|-
| Standard strength || H-20 || H-25 || H-20 || H20-HS25
|-
| Manufacturer || Contech || "Contech Stormtrap Rotondo" || "Contech Stormchamber Cultech" || "Ecorain Atlantis Stormtank"
|}
==Planning Considerations==
==Planning Considerations==