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sys1=[[Single Pit System |1]]|

sys2=[[Blackwater Treatment System with Infiltration|5]]|

|spanish_link=Humedal_Artificial_de_Flujo_de_Horizontal_subsuperficial

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[[Image:Icon_horizontal_subsurface_flow_constructed_wetland.png |right|95px]]

'''A Horizontal Subsurface Flow Constructed Wetland is a large gravel and sand-filled channel that is planted with aquatic vegetation. As wastewater flows horizontally through the channel, the filtermaterial filters out particles and microorganisms degrade organics.'''