CEIE 230 Weirs

CEIE 230 Weirs - C = weir constant Q = flow rate (ft 3 /sec...

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1 Open Channel Measurement • Turbine meters • Weirs – Broad Crested (all are suppressed) – Sharp Crested • Suppressed • Contracted – Rectangular – V-Notch – Trapezoidal • Flume Meters (Parshall) Broad Crested Weir Q = CL(g) 1/2 H 3/2 C = 0.3536 / [1 + (H/h)] 1/2 Where: H = Head of the Weir h = Height of weir L = Channel Width H h
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2 Sharp Crested Suppressed Weirs Length (L) Weir Height (h) Head of Water (H) Channel Cross-Section Where: L = channel width (ft or M) Y = head above weir (ft or M) h = weir height (ft or M) C = weir constant Q = flow rate (ft 3 /sec or M 3 /sec) Sharp Crested Weir
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3 Where: b = weir opening width (ft or M) Y = upstream head above weir (ft or M) C = weir constant Q = flow rate (ft 3 /sec or M 3 /sec) Y h Contracted Sharp Crested Rectangular Weir Where: Y = upstream head (ft or M) h = weir height (ft or M)
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Unformatted text preview: C = weir constant Q = flow rate (ft 3 /sec or M 3 /sec) Y h Contracted V-Notch Sharp Crested Weir 4 Where: b = weir opening width (ft or M) Y = upstream head (ft or M) C = weir constant Q = flow rate (ft 3 /sec or M 3 /sec) Y b Contracted Trapezoidal Weir Weirs Advantages Can be designed for a wide range of flows Can regulate flows in open channel Accuracy Disadvantages Can clog with debris High headloss at high flows 5 Where: B = weir throat width (ft) H = upstream head (ft) Q = Flow rate (ft 3 /sec) Parshall Flume Flumes Advantages Simple to design Do not clog Less headloss than a weir Can be very accurate Disadvantages Hard to construct in the field Hard to calibrate...
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CEIE 230 Weirs - C = weir constant Q = flow rate (ft 3 /sec...

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