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→Planning
==Planning==
==Planning==
{| class="wikitable"
|+ Things to consider when planning a rooftop detention system
|-
!Advantages
!Limitations
|-
|
*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
|
*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==
==Design==