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→Planning considerations
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|Soil
−|
|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.
|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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|-
−|style="text-align:left;"|'''Pros'''
|style="text-align:left;"|'''Pros'''
−*High levels of treatement possible
+|style="text-align:left;"|'''Pros'''
−*DIY possible
+*Well established technology
+*Low cost
+*May be natural looking
+*Need little to no gradient
+*Provides buffer to discharge
+*Good pathogen removal from die off and predation
+*Minimal maintenance
+*Wide range of plants suitable
+*Robust
+|style="text-align:left;"|'''Pros'''
+*High levels of treatment possible
+*DIY possible (to lower cost)
*May be run without power if significant gradient is avaialble
*May be run without power if significant gradient is avaialble
*Can be attractively designed to generate interest in the technology.
*Can be attractively designed to generate interest in the technology.
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*Biologically complex and robust
*Biologically complex and robust
*Failure tends to be gradual
*Failure tends to be gradual
−*Will function prior to establishment of vegitation
+*Will function prior to establishment of vegetation
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|-
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|style="text-align:left;"|'''Cons'''
|style="text-align:left;"|'''Cons'''
+*Requires more land
+|style="text-align:left;"|'''Cons'''
+*Requires fall of at least 1.5 m to provide sufficient treatment
+*May be high cost
+*Sensitive to hydraulic overloading
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|Maintenance||Medium to high||Low
|Maintenance||Medium to high||Low