4.1 – Rainwater collection and drainage systems – 9. Sizing of gutters and drainage downpipes 285 The following tables show the data for the sizing of downpipes and gutters according to the roof surface, with a wide safety margin and for quick reading. Table for rainfall of 300 l/s (s*ha) Roof area to be connected with rainfall max r = 300 l/(s*ha) Downpipes Related gutter Semicircular Box-shaped Rainwater drain (Q) Nominal size (diameter) Section Nominal size (length) Gutter section Nomina size (length) Gutter section m2 l/s mm cm2 mm cm2 mm cm2 37 1.1 60 28 200 25 200 28 57 1.7 70 38 – – – – 83 2.5 80 50 250 43 250 42 150 4.5 100 79 333 92 333 90 243 7.3 120 113 400 145 400 135 270 8.1 125 122 – – – – 443 13.3 150 177 500 245 500 220 Table for rainfall of 500 l/s (s*ha) – Simplified representation Roof area up to Downpipe (diameter) Gutter size (length) m2 mm mm 24 60 200 52 80 250 / 285 94 100 333 152 120 400 276 150 500 EXCERPT
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