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  1. Auchlossen
    I have a sedum covered flat roof of 153m2, with a slope toward one corner, and an upstand all round. There is a border of stone all round in the 'gutter' area. This is all standard design. The outlet is at one corner. What size should the outlet and downpipe be? There is some info about gutter sizing on gutter manufacturer websites, but I have not found any very convincing clarification of downpipe size. My calcs are: Roof area = 153m2 Rainfall factor x 0.0208 = 3.18 l/sec = 190.8l/min 100mm downpipe has flow capacity of 3.5 l/sec = 210 l/min 75mm downpipe has flow capacity of 1.97 l/sec is this correct? Can anyone advise sources please?
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