|+Design parameters for free-water surface flow wetlands <refname="TRCA">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>
|+Design parameters for free-water surface flow wetlands <ref name="TRCA">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
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{| class="wikitable"
{| class="wikitable"
|+Water volume storage requirements based on catchment type and receiving waters<refname ="TRCA"/>
|+Water volume storage requirements based on catchment type and receiving waters<ref name ="TRCA"/>
!rowspan=2|Performance level
!rowspan=2|Performance level
!colspan=4|Storage volume (m<sup>3</sup>/Ha) required according to catchment impervious cover
!colspan=4|Storage volume (m<sup>3</sup>/Ha) required according to catchment impervious cover