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 Drains | Horizontal 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 Drains | Horizontal Sloped Pipe - (slope cm/m) | |||
| 1 | 2.1 | 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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