53 071 principles of hydraulics laboratory experiment 4 weir calibration n.
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53:071 Principles of Hydraulics Laboratory Experiment #4 Weir Calibration. Li-Chuan Chen, Marian Muste, and Larry Weber. Objective.

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53:071 Principles of Hydraulics Laboratory Experiment #4 Weir Calibration


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53 071 principles of hydraulics laboratory experiment 4 weir calibration

53:071 Principles of HydraulicsLaboratory Experiment #4Weir Calibration

Li-Chuan Chen, Marian Muste, and Larry Weber

objective
Objective
  • To determine the head-discharge relationship of three different shapes of weirs, and to compare the experimental results with their corresponding analytical expressions.
principle1
Principle

Slope

Intercept

procedures
Procedures
  • Insert the weir of the desired shape.
  • Record the reference point of the weir.
  • Set the appropriate discharge in the flume.
  • Record the water surface elevation upstream of the weir
  • Repeat Steps 3 and 4 for four more discharges.
  • Repeat Steps 1 to 5 for two more weir shapes.
data sheet

Discharge

Triangular 60

h

(ft)

Q

(cfs)

Ref. Point (ft)

W.S. Elev.

(ft)

Weir Head

(ft)

Data Sheet
analysis
Analysis
  • Determine the discharge Q in the flume (using the side-contraction meter) and the head H on the weirs.
  • Using several measured Q-H pairs, plot log Q versus log H.
  • From the best-fit line to the experimental points, determine the kexp (the intercept) and nexp (the slope).
  • Compare kexp and nexp with values indicated in the literature.
further considerations
Further Considerations
  • Derive, analytically, the head-discharge relationship for each of the weir shapes.
  • If data seem to imply nexp ntheory, why?