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

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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  1. 53:071 Principles of HydraulicsLaboratory Experiment #4Weir Calibration Li-Chuan Chen, Marian Muste, and Larry Weber

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

  3. Principle

  4. Principle Slope Intercept

  5. Apparatus — Flume

  6. Apparatus — Weirs

  7. 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.

  8. Discharge Triangular 60 h (ft) Q (cfs) Ref. Point (ft) W.S. Elev. (ft) Weir Head (ft) Data Sheet

  9. 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.

  10. Sample Result

  11. Further Considerations • Derive, analytically, the head-discharge relationship for each of the weir shapes. • If data seem to imply nexp ntheory, why?

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