TSM 352 Land and Water Mgt Systems
Observation and Analysis of Hydraulic Jumps
PROCEDURE
1. Allow the flow to become established and a jet to be developed under the upstream
gate.
2. Adjust the downstream gate carefully to create a hydraulic jump which is fixed at
about the midsection of the flume.
3. Measure upstream and downstream water depths and the length of the jump
4. Use the weighing gage to measure the flow rate
5. Repeat steps 1 through 4 for a total of five different flow rates.
Upstream
Depth (in)
Downstream Length of
Depth (in)
Jump (in)
Weight of Time (s)
water (lbs)
Flow rate
ANALYSIS
1. Collect the measurements from all three groups. Use the flow rate to determine
upstream and downstream velocities. The flume is 2 feet wide.
2. Determine the upstream and downstream energy, and Froude numbers for each
run.
3. The theoretical depth ratio for a hydraulic jump is given by


d2 1

1  8Fr12  1 . Plot a graph of theoretical versus observed depth ratio,
d1 2
and fit a line to these data. Determine the equation and correlation coefficient
for the plot.
4. The theoretical energy loss in a hydraulic jump is given by
H 
d 2  d1 3
. Plot a graph of theoretical versus observed energy loss, and fit
4d 1 d 2
a line to these data. Determine the equation and correlation coefficient for the
plot. Plot a graph of Froude number ratio versus energy loss.
5. Comment on how well the measured data fits the theory. Discuss possible causes of
any discrepancies. Which of the two fitted lines have the higher correlation
coefficient? Why? Suggest three uses for hydraulic jumps.