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→Design
==Design==
==Design==
{| class="wikitable"
{| class="wikitable"
|+Design parameters for free-water surface flow wetlands <ref>Toronto and Region Conservation Authority (TRCA), and CH2M Hill Canada. 2018. Inspection and Maintenance Guide for Stormwater Management Ponds and Constructed Wetlands (T van Seters, L Rocha, and K Delidjakovva, Eds.).</ref>
!Element
!Element
!Design Objective
!Design Objective
|-
|-
|Drainage Area
|Drainage Area
|Sustaining vegetation, volumetric turnover
|Sustaining [[Plants|vegetation]], volumetric turnover
|style="text-align: left|5 Ha (≥10 Ha preferred)
|style="text-align: left|5 Ha (≥10 Ha preferred)
|-
|-
|Active Storage
|Active Storage
|Detention
|Detention
|style="text-align: left|Suspended solids settling 24 hrs (12 hrs if in conflict with min. orifice size)
|style="text-align: left|[[Total Suspended solids|Suspended solids]] settling 24 hrs (12 hrs if in conflict with min. orifice size)
|-
|-
|Forebay
|Forebay
#Forebay: minimum 2:1
#Forebay: minimum 2:1
|-
|-
|Permanent Pool Depth
|Permanent pool depth
|Vegetation requirements, rapid settling
|Vegetation requirements, rapid settling
|style="text-align: left|The average permanent pool depth should range from 150 mm to 300 mm
|style="text-align: left|The average permanent pool depth should range from 150 mm to 300 mm
|-
|-
|Active Storage Depth
|Active storage depth
|Storage/flow control, sustaining vegetation
|Storage/flow control, sustaining vegetation
|style="text-align: left|Maximum 1.0 m for storms < 10 year event
|style="text-align: left|Maximum 1.0 m for storms < 10 year event
|-
|-
|Side Slopes
|Side slopes (See also [[berms]])
|Safety
|Safety
|style="text-align: left|
|style="text-align: left|
#If submerged, obvert 150 mm below expected maximum ice depth
#If submerged, obvert 150 mm below expected maximum ice depth
|-
|-
|Outlet
|Outlet (See also [[flow control]])
|Avoid clogging/freezing
|Avoid clogging/freezing
|style="text-align: left|
|style="text-align: left|
#Preferred pipe slope: >1%;
#Preferred pipe slope: >1%;
#If orifice control used, 75mm diameter minimum;
#If orifice control used, 75mm diameter minimum;
#Minimum 100mm orifice preferable
#Minimum 100mm orifice preferable
|-
|-
|Maintenance Access
|Maintenance access
|Access for backhoes or dredging equipment
|Access for backhoes or dredging equipment
|style="text-align: left|
|style="text-align: left|