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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.
+A study in New York City found that a modular system of trays outperformed an outlet flow control device in stormwater management<ref>Bloomberg, M., & Strickland, C. H. (2012). NYC Green Infrastructure Plan: 2012 Green Infrastructure Pilot Monitoring Report. New York. Retrieved from http://www.nyc.gov/html/dep/pdf/green_infrastructure/2012_green_infrastructure_pilot_monitoring_report.pdf</ref>. It might reasonably be expected that a modular system would present fewer opportunities for complete failure from a single action, either through clogging or breakage of an storage element.
<ref>Richard Hammond (2017). Evaluating Green and Blue Roof Opportunities in Canadian Cities. UWSpace. http://hdl.handle.net/10012/11463</ref>
<ref>Richard Hammond (2017). Evaluating Green and Blue Roof Opportunities in Canadian Cities. UWSpace. http://hdl.handle.net/10012/11463</ref>
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==Providers==
==Providers==
{{:Disclaimer}}
{{:Disclaimer}}
+These products are designed to suspend green roof (or other) systems above a layer of free water for the detention period.
*[https://www.hydrotechusa.com/assemblies/roofing/blue-roofs Hydrotech]
*[https://www.hydrotechusa.com/assemblies/roofing/blue-roofs Hydrotech]
*[http://www.liveroof.com/roofblue/ Livegreen]
*[http://www.liveroof.com/roofblue/ Livegreen]
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