[[File:Tilley et al 2014 Schematic of the Vertical Flow Constructed Wetland.jpg|thumb|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|thumb|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.]] |