Discharge Tables
The discharge tables here are for thin-plate Weirs in general.
Before relying on the full flow rates indicated on the tables below, compare the depths indicated in the tables versus your application. The tables below have been calculated to their maximum rating and your installation may not have as much flow depth available as is shown in the tables.
22 1/2º V-Notch Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Minimum 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 | Table is for maximum weir depth of 2-feet [60.96 cm] |
30º V-Notch Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Minimum 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 | Table is for maximum weir depth of 2-feet [60.96 cm] |
45º V-Notch Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Minimum 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 | Table is for maximum weir depth of 2-feet [60.96 cm] |
60º V-Notch Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Minimum 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 | Table is for maximum weir depth of 2-feet [60.96 cm] |
90º V-Notch Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Minimum 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 | Table is for maximum weir depth of 2-feet [60.96 cm] |
120º V-Notch Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Minimum 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 | 4.330*H2.5 | ||
Equation=l/s, m | 2391*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 |
Minimum 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 | ||
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 |
Minimum 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 |
Minimum 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 | 1133*H1.5 | ||
Download The Full Table | Table is for maximum weir depth of 1-foot [30.48 cm] |
2 1/2-foot Cipolletti Weir
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Minimum Flow Rate (cfs) | 0.7529 | Minimum Flow Rate (l/s) | 17.06 |
Maximum Head (ft) | 1.25 | Maximum Head (m) | 0.3048 |
Maximum Flow Rate (cfs) | 11.76 | Maximum Flow Rate (l/s) | 333.2 |
Equation=cfs, ft | 8.418*H1.5 | ||
Equation=l/s, m | 1487*H1.5 | ||
Download The Full Table | Table is for maximum weir depth of 1.25-feet [38.1 cm] |
1 1/2-foot Rectangular w/ End Contractions
Minimum Head (ft) | 0.20 | Minimum Head (m) | 0.0610 |
Minimum Flow Rate (cfs) | 0.7529 | Minimum Flow Rate (l/s) | 12.32 |
Maximum Head (ft) | 2.0 | Maximum Head (m) | 0.6096 |
Maximum Flow Rate (cfs) | 10.36 | Maximum Flow Rate (l/s) | 293.4 |
Equation=cfs, ft | 3.330 (1.5 - 0.2H)*H1.5 | ||
Equation=l/s, m | 1838 (0.4572 - 0.2H) *H1.5 | ||
Download The Full Table | Table is for maximum weir depth of 2.00-feet [60.96 cm] |