Changes

*Structurally reinforced chambers

*Structurally reinforced chambers

*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|Pipe]]

{| class="wikitable"

{| class="wikitable"

! Crates

! Crates

|-

|-

|[[File:SWM Pipe.jpg|thumb]]

|[[File:SWM Pipe.jpg|frameless]]

|[[File:SWM Vaults.jpg|thumb]]

|[[File:SWM Vaults.jpg|frameless]]

|[[File:SWM Arches.jpg|thumb]]

|[[File:SWM Arches.jpg|frameless]]

|[[File:SWM Crates.jpg|thumb]]

|[[File:SWM Crates.jpg|frameless]]

|-

|-

| Materials || Plastic || Concrete || Plastic/concrete || Plastic

| Materials || Plastic || Concrete || Plastic/concrete || Plastic