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→Green Roof
==Green Roof==
==Green Roof==
Please see below a profile view of a standard extensive green roof with a stone buffer layer, growing medium, filter layer, drainage layer, root barrier/protection layer, waterproof membrane and vapour barrier. What makes the following drawing an extensive green roof is that it consists of a thinner planting medium layer ( ≤15 cm deep) with herbaceous vegetative cover that possess shallower root systems and is designed for SWM purposes, and generally don't provide public access.
Drawing is from Metro Vancouver's, [http://www.metrovancouver.org/services/liquid-waste/LiquidWastePublications/StormwaterSourceControlDesignGuidelines2012StormwaterSourceControlDesignGuidelines2012.pdf Stormwater Source Control Design Guidelines document] <ref>http://www.metrovancouver.org/services/liquid-waste/LiquidWastePublications/StormwaterSourceControlDesignGuidelines2012StormwaterSourceControlDesignGuidelines2012.pdf Stormwater Source Control Design Guidelines </ref> document. For further details about these cross section drawings please visit the link.
[[File:Green roof extensive profile.PNG|800px]]
==Permeable Pavements==
==Permeable Pavements==