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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
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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
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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) 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
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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
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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) 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
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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]