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==Planning==
==Planning==
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{| class="wikitable"
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|+ Things to consider when planning a rooftop detention system
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!Advantages
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!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,
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*May not require additional sewer connections,
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*Easy to retrofit if structural support and waterproofing are adequate,
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*Relatively low cost
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*Absolutely need regular inspection and maintenance,
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*Limited application on sloped roofs or sites with small building footprints,
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*Do not provide any co-benefits such as habitat creation or air quality improvements associated with vegetated practices,
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*Mechanical systems and other rooftop architectural features must not be adversely impacted by ponded water.
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==Design==
==Design==