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Recent content by leecivil
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Annual Recurrence Interval (ARI) for Roof and Surface Drains
Thanks guys. I also agree it's the risk of flooding and damage on the roofs as compared to surface drains.- leecivil
- Post #4
- Forum: Storm/Flood engineering
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Annual Recurrence Interval (ARI) for Roof and Surface Drains
Hi, Can anyone give me a proper explanation why roof drainage systems (downpipes, gutters, etc.) are typically sized different in ARI than the surface drains it outfalls to? Example, roof downpipes are designed to 20-Yr ARI along with overflow measures e.g. rainheads However, it discharges to...- leecivil
- Thread
- Replies: 4
- Forum: Storm/Flood engineering
