Technical Booklet N Drainage·Page 31·Diagram 4.1
Discharge capacities of rainwater drains running full
This diagram shows the discharge capacity in litres per second for rainwater drains of different diameters (75 mm, 100 mm, 150 mm) at various gradients (1:10 to 1:200).
Diagram 4.1 Discharge capacites of rainwater drains running full
Flow rate (litres per second) by gradient:
Gradient | 150 mm diameter | 100 mm diameter | 75 mm diameter
1:10 | 30 | 20 | 10
1:20 | 9 | 8 | 7
1:30 | 6 | 5 | 4
1:40 | 3 | 2 | 1
1:50 | (values not fully legible in source)
1:60 | (values not fully legible in source)
1:80 | (values not fully legible in source)
1:100 | (values not fully legible in source)
1:150 | (values not fully legible in source)
1:200 | (values not fully legible in source)
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