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