Discharge Tables
Below are the discharge tables, equations, and minimum / maximum heads for Weir Plates commonly used in Openchannelflow
Weir Channels.
For additional weir discharge tables, visit the Weir Plate Discharge Tables section.
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) | 2.00 | Maximum Head (m) | 0.6096 |
Maximum Flow Rate (cfs) | 2.811 | Maximum Flow Rate (l/s) | 76.62 |
Equation=cfs, ft | 0.4970*H2.5 | ||
Equation=l/s, m | 274.4*H2.5 | ||
Download The Full Table | Verify weir depth |
30º V-Notch Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Miniumum Flow Rate (cfs) | 0.0121 | Minimum Flow Rate (l/s) | 0.3425 |
Maximum Head (ft) | 2.00 | Maximum Head (m) | 0.6096 |
Maximum Flow Rate (cfs) | 3.824 | Maximum Flow Rate (l/s) | 108.3 |
Equation=cfs, ft | 0.6760*H2.5 | ||
Equation=l/s, m | 373.2*H2.5 | ||
Download The Full Table | Verify weir depth |
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) | 2.00 | Maximum Head (m) | 0.6096 |
Maximum Flow Rate (cfs) | 5.855 | Maximum Flow Rate (l/s) | 165.8 |
Equation=cfs, ft | 1.035*H2.5 | ||
Equation=l/s, m | 571.4*H2.5 | ||
Download The Full Table | Verify weir depth |
60º V-Notch Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Miniumum Flow Rate (cfs) | 0.0258 | Minimum Flow Rate (l/s) | 0.7310 |
Maximum Head (ft) | 2.00 | Maximum Head (m) | 0.6096 |
Maximum Flow Rate (cfs) | 8.163 | Maximum Flow Rate (l/s) | 231.2 |
Equation=cfs, ft | 1.443*H2.5 | ||
Equation=l/s, m | 798.7*H2.5 | ||
Download The Full Table | Verify weir depth |
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) | 2.00 | Maximum Head (m) | 0.6096 |
Maximum Flow Rate (cfs) | 14.14 | Maximum Flow Rate (l/s) | 400.5 |
Equation=cfs, ft | 2.500*H2.5 | ||
Equation=l/s, m | 1,380*H2.5 | ||
Download The Full Table | Verify weir depth |
120º V-Notch Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Miniumum Flow Rate (cfs) | 0.0775 | Minimum Flow Rate (l/s) | 2.194 |
Maximum Head (ft) | 2.00 | Maximum Head (m) | 0.6096 |
Maximum Flow Rate (cfs) | 24.49 | Maximum Flow Rate (l/s) | 693.7 |
Equation=cfs, ft | 0.4970*H2.5 | ||
Equation=l/s, m | 274.4*H2.5 | ||
Download The Full Table | Table is for maximum weir depth of 2-feet [60.96 cm] |
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*H1.5 | ||
Download The Full Table | Table is for maximum weir depth of 6-inches [15.24 cm] |
1 1/2-foot Cipolletti Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Miniumum Flow Rate (cfs) | 0.4518 | Minimum Flow Rate (l/s) | 12.79 |
Maximum Head (ft) | 0.75 | Maximum Head (m) | 0.2286 |
Maximum Flow Rate (cfs) | 3.281 | Maximum Flow Rate (l/s) | 92.91 |
Equation=cfs, ft | 5.051*H1.5 | ||
Equation=l/s, m | 743.6*H1.5 | ||
Download The Full Table | Table is for maximum weir depth of 9-inches [22.86 cm] |
2-foot Cipolletti Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Miniumum Flow Rate (cfs) | 0.6023 | Minimum Flow Rate (l/s) | 17.06 |
Maximum Head (ft) | 1.00 | Maximum Head (m) | 0.3048 |
Maximum Flow Rate (cfs) | 6.734 | Maximum Flow Rate (l/s) | 190.7 |
Equation=cfs, ft | 6.734*H1.5 | ||
Equation=l/s, m | 1134*H1.5 | ||
Download The Full Table | Table is for maximum weir depth of 1-foot [30.48 cm] |