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[[File:Blue_roof.png|thumb|Schematic of flow control valve type blue roof/ rooftop detention]]
Blue roofs are
Ministry of Transportation do not permit blue roofs to form part of a SWM plan owing to concerns over long term maintenance; this affects relatively few projects. The concerns arise from instances where
Ministry of Transportation do not permit blue roofs to form part of a SWM plan owing to concerns over long term maintenance; this affects relatively few projects. The concerns arise from instances where
building operators have found outlet control structures blocked with leaves or other debris. Without understanding the purpose of the device, these have been removed to prevent recurrence of the blockage.
building operators have found outlet control structures blocked with leaves or other debris. Without understanding the purpose of the device, these have been removed to prevent recurrence of the blockage.