Simple sanitary sewer system calculator tool that helps you to calculate the flow rate through the pipe.
| Pipe diameter, in (mm) | Pipe cross-sectional area, sq ft (m2) | n | ||||
|---|---|---|---|---|---|---|
| 0.011 | 0.013 | 0.015 | 0.017 | |||
| 6 (152) | 0.196 (0.02) | 6.62 | 5.60 | 4.85 | 4.28 | |
| 8 (203) | 0.349 (0.03) | 14.32 | 12.12 | 10.50 | 9.27 | |
| 10 (254) | 0.545 (0.05) | 25.80 | 21.83 | 18.92 | 16.70 | |
| 12 (305) | 0.785 (0.07) | 42.15 | 35.66 | 30.91 | 27.27 | |
| 15 (381) | 1.227 (0.11) | 76.46 | 64.70 | 56.07 | 49.48 | |
| 18 (457) | 1.767 (0.16) | 124.2 | 105.1 | 91.04 | 80.33 | |
| 21 (533) | 2.405 (0.22) | 187.1 | 158.3 | 137.2 | 121.1 | |
Formula:
Q = Cf × S1/2
where,- Q = Flow rate through the pipe
- Cf = Conveyance factor corresponding to a specific n value
- S = pipe slope or hydraulic gradient