CEIE 230 Weirs

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

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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
Background image of page 2
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)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 4
Background image of page 5
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Page1 / 5

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

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online