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→Performance
[[File:YorkU1.jpg|thumb|Recently laid ''Sedum'' mats on a ground level podium roof.]]
[[File:YorkU1.jpg|thumb|Recently laid ''Sedum'' mats on a ground level podium roof.]]
[[File:YorkU2.jpg|thumb|Detail showing the early root development through the mat to the granular planting medium.]]
[[File:YorkU2.jpg|thumb|Detail showing the early root development through the mat to the granular planting medium.]]
Green roofs are primarily a practice used to achieve water balance objectives.
{| class="wikitable"
|+ Ability of green roofs to meet SWM objectives
|-
!Water balance benefit
!Water quality improvement
!Erosion control benefit
|-
|Yes: Through interception and evapotranspiration
|No: Green roof runoff may contain elevated concentrations of some contaminants, particularly [[Phosphorus]] and Nitrogen.
|No:
|}
Controlled studies have indicated that maturing green roofs may have improved water retention properties <ref>Simon De-Ville, Manoj Menon, Xiaodong Jia, George Reed, Virginia Stovin. 2017. The impact of green roof ageing on substrate characteristics and hydrological performance, In Journal of Hydrology, Volume 547, Pages 332-344, ISSN 0022-1694, https://doi.org/10.1016/j.jhydrol.2017.02.006.</ref>.
Controlled studies have indicated that maturing green roofs may have improved water retention properties <ref>Simon De-Ville, Manoj Menon, Xiaodong Jia, George Reed, Virginia Stovin. 2017. The impact of green roof ageing on substrate characteristics and hydrological performance, In Journal of Hydrology, Volume 547, Pages 332-344, ISSN 0022-1694, https://doi.org/10.1016/j.jhydrol.2017.02.006.</ref>.