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  1. leecivil

    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...

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