Technical Booklet N Drainage·Page 30·Table 4.3
Table 4.3 - Gutter and outlet sizes for true half round eaves gutters
This table specifies the maximum effective roof areas that can drain to various gutter diameters, the corresponding minimum outlet sizes, and flow capacities in litres per second.
Max effective roof area (m2): –, 6.0, 18.0, 37.0, 53.0, 65.0, 103.0
Gutter size (mm diameter): 75, 100, 115, 125, 150
Outlet size (mm diameter): –, 50, 63, 63, 75, 89
Flow capacity (litres/sec): –, 0.38, 0.78, 1.11, 1.37, 2.16
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