Changes

!Vertical sub-surface flow

!Vertical sub-surface flow

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|[[File:Schematic of the Free Water Surface Constructed Wetland.jpg|frameless|Schematic of a free-water surface constructed wetland: It aims to replicate the naturally occurring processes, where particles settle, pathogens are destroyed, and organisms and plants utilize the nutrients.]]

|[[File:Schematic of the Free Water Surface Constructed Wetland.jpg|frameless]]

|[[File:Tilley et al 2014 Schematic of the Horizontal Subsurface Flow Constructed Wetland.jpg|frameless|Schematic of the Horizontal Subsurface Flow Constructed Wetland: Water flows horizontally through the bed.]]

|[[File:Tilley et al 2014 Schematic of the Horizontal Subsurface Flow Constructed Wetland.jpg|frameless]]

|[[File:Tilley et al 2014 Schematic of the Vertical Flow Constructed Wetland.jpg|frameless|Schematic of a vertical subsurface flow constructed wetland: Water flows through pipes on the subsurface of the ground through the root zone to the ground.]]

|[[File:Tilley et al 2014 Schematic of the Vertical Flow Constructed Wetland.jpg|frameless|Schematic of a vertical subsurface flow constructed wetland: Water flows through pipes on the subsurface of the ground through the root zone to the ground.]]

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|Surface water||Minimal<br>Any surface flow can be slowed with check dams||Ponding is encouraged with check dams

|Schematic of a free-water surface constructed wetland: It aims to replicate the naturally occurring processes, where particles settle, pathogens are destroyed, and organisms and plants utilize the nutrients.

|Schematic of the Horizontal Subsurface Flow Constructed Wetland: Water flows horizontally through the bed.

|Schematic of a vertical subsurface flow constructed wetland: Water flows through pipes on the subsurface of the ground through the root zone to the ground.

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|Soil||Filter media required||Amendment preferable when possible

|Soil

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|Underdrain||Common||Uncommon

|Underdrain||Common||Uncommon