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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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