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Blue roofs (view source)

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==Planning==

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|+ Things to consider when planning a rooftop detention system

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!Advantages

!Limitations

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|

*Does not require ground level space, so particularly well suited where ground space is limited or sites with large flat roofs,

*May not require additional sewer connections,

*Easy to retrofit if structural support and waterproofing are adequate,

*Relatively low cost

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*Absolutely need regular inspection and maintenance,

*Limited application on sloped roofs or sites with small building footprints,

*Do not provide any co-benefits such as habitat creation or air quality improvements associated with vegetated practices,

*Mechanical systems and other rooftop architectural features must not be adversely impacted by ponded water.

|}

==Design==

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