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Stormwater Conductors

Capacities of roof drains

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Capacities of horizontal sloped and vertical stormwater and rainwater leaders:

Imperial Units


Pipe Size NPS
(in)
Capacity  (gpm)
Vertical Roof DrainsHorizontal Sloped Pipe
(slope in/ft)
1/8 1/4 1/2
3 90 35 50 70
4 190 80 110 157
5 360 140 200 280
6 560 225 315 450
8 1200 480 680 950
10 860 1220 1728

Metric Units

Pipe Size DN
(mm)
Capacity (l/s)
Vertical Roof DrainsHorizontal Sloped Pipe
(slope cm/m)
12.1 4.2
80 5.8 2.1 3.0 4.3
100 12 4.9 6.9 9.9
125 23 8.8 12 18
150 35 14 20 28
200 76 30 43 60
250 54 77 109
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