Portable Weir Discharge Tables
The discharge tables presented here are specific to the four interchangeable weir plates provided with each standard Portable Weir Plate set.
22 1/2º V-Notch Weir
| Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
| Miniumum Flow Rate (cfs) | 0.0089 | Minimum Flow Rate (l/s) | 0.2518 |
| Maximum Head (ft) | 0.62 | Maximum Head (m) | 0.1890 |
| Maximum Flow Rate (cfs) | 0.1504 | Maximum Flow Rate (l/s) | 4.260 |
| Equation=cfs, ft | 0.4970*H2.5 | ||
| Equation=l/s, m | 274.4*H2.5 | ||
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45º V-Notch Weir
| Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
| Miniumum Flow Rate (cfs) | 0.0185 | Minimum Flow Rate (l/s) | 0.5243 |
| Maximum Head (ft) | 0.62 | Maximum Head (m) | 0.1890 |
| Maximum Flow Rate (cfs) | 0.3133 | Maximum Flow Rate (l/s) | 8.872 |
| Equation=cfs, ft | 1.035*H2.5 | ||
| Equation=l/s, m | 571.4*H2.5 | ||
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90º V-Notch Weir
| Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
| Miniumum Flow Rate (cfs) | 0.0447 | Minimum Flow Rate (l/s) | 1.267 |
| Maximum Head (ft) | 0.62 | Maximum Head (m) | 0.1890 |
| Maximum Flow Rate (cfs) | 0.7567 | Maximum Flow Rate (l/s) | 21.43 |
| Equation=cfs, ft | 2.500*H2.5 | ||
| Equation=l/s, m | 1,380*H2.5 | ||
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1-foot Cipolletti Weir
| Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
| Miniumum Flow Rate (cfs) | 0.3012 | Minimum Flow Rate (l/s) | 8.529 |
| Maximum Head (ft) | 0.50 | Maximum Head (m) | 0.1524 |
| Maximum Flow Rate (cfs) | 1.190 | Maximum Flow Rate (l/s) | 33.71 |
| Equation=cfs, ft | 3.367*H1.5 | ||
| Equation=l/s, m | 557.7*H1.55 | ||
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