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Blue roofs (view source)

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===Flow control devices===

*[http://www.wattscanada.ca/pages/_products_details.asp?pid=3810 Watts Canada]

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[http://www.zurn.com/products/building-drainage/roof-drains/control-flow/z105#Features Zurn]

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*[http://www.zurn.com/products/building-drainage/roof-drains/control-flow/z105#Features Zurn]

===Other===

These products are designed to suspend green roof (or other) systems above a layer of free water for the detention period.

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