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Gutter Flow Rates
All rates on this page are in litres per second. Gutter capacities are based on BS EN 12056-3:2000, assuming a maximum distance of 50 x gutter depth from high point to outlet. Longer gutters, or gutters with corners exceeding 10, will have a reduced capacity. For further information, contact Technical Services.
Rainwater gutter flow rates (l/s)
| Gutter | Pipe outlet (mm) | |||||||
|---|---|---|---|---|---|---|---|---|
| Profile | Code | Size (mm) | 63 | 75 | 100 | 75 x 75 | 100 x 75 | 100 x 100 |
| Half Round | CIH40 | 100 | 1.19 | 1.22 | ||||
| Half Round | CIH45 | 113 | 1.19 | 1.62 | ||||
| Half Round | CIH50 | 125 | 1.19 | 1.62 | 2.06 | |||
| Half Round | CIH60 | 152 | 1.19 | 1.64 | 3.14 | |||
| Beaded Half Round | CIB45 | 113 | 1.19 | 1.62 | ||||
| Beaded Half Round | CIB50 | 125 | 1.19 | 1.97 | 2.06 | |||
| Deep Half Round | CIDH53 | 125 x 75 | 1.77 | 1.97 | ||||
| Victorian Ogee | CIO45 | 113 | 1.24 | 1.8 | ||||
| Victorian Ogee | CIO50 | 125 | 1.24 | 1.97 | 2.32 | |||
| Moulded Ogee | CIM43 | 100 x 75 | 1.09 | 1.64 | 2.24 | 2.24 | ||
| Moulded Ogee | CIM54 | 125 x 100 | 1.09 | 1.64 | 3.21 | 2.17 | 3.17 | |
| Moulded Ogee | CIM64 | 150 x 100 | 1.09 | 1.64 | 3.21 | 2.17 | 3.17 | 4.43 |
Rainwater pipe flow rates
The capacity of a rainwater system usually depends on the capacity of the gutter outlet or flat roof outlet, rather than the rainwater pipe. Please refer to BS EN 12056-3:2000, Section 6, Table 8 for the capacities of vertical rainwater pipes.
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