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→Performance
[[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.
Green roofs are primarily a practice used to partially achieve water balance and erosion control objectives.
{| class="wikitable"
{| class="wikitable"
|+ Ability of green roofs to meet SWM objectives
|+ Ability of green roofs to meet SWM objectives