Question:medium
A hydraulic jump occurs in an open channel when the slope of the channel changes from ___________.
A hydraulic jump occurs in an open channel when the slope of the channel changes from ___________.
Show Hint
Hydraulic jumps are energy-dissipating phenomena in channels, usually formed when supercritical flow transitions to subcritical flow.
Updated On: Feb 4, 2026
- MILD slope to STEEP slope
- STEEP slope to MILD slope
- MILD slope to ZERO slope
- STEEP slope to a STEEPER slope
Show Solution
The Correct Option is B
Solution and Explanation
A hydraulic jump is formed in an open channel when the flow transitions from supercritical flow \((F_r>1)\) to subcritical flow \((F_r<1)\). This typically occurs when a steep slope (which supports supercritical flow) changes to a mild slope, causing the flow to decelerate and a jump to form.
This change in slope causes the kinetic energy of the flow to be suddenly dissipated, forming a jump which is visible as a sudden rise in the water surface.
Hence, the correct answer is (B).
This change in slope causes the kinetic energy of the flow to be suddenly dissipated, forming a jump which is visible as a sudden rise in the water surface.
Hence, the correct answer is (B).
Was this answer helpful?
0
Top Questions on Open Channel Flow
- Critical depth in a channel is expressed by: (where $Q =$ discharge, $A =$ Area of flow, $T =$ top width of flow and $g =$ acceleration due to gravity)
- CUET (PG) - 2025
- Civil Structural and Transport Engineering
- Open Channel Flow
- Match LIST-I with LIST-II:\[\begin{array}{|c|l|l|} \hline \textbf{LIST-I (Flow parameter of a channel flow)} & & \textbf{LIST-II (Proportional to)} \\ \hline \text{A. Mean velocity in a Lacey regime channel} & & \text{IV. $Q^{2/3}$} \\ \hline \text{B. Mean velocity in a lined channel} & & \text{II. $S^{1/3}$} \\ \hline \text{C. Normal scour depth in an alluvial channel} & & \text{III. $Q^{1/2}$} \\ \hline \text{D. Wetted perimeter of a Lacey regime channel} & & \text{I. $S^{1/2}$} \\ \hline \end{array}\] where $S$ is slope of channel and $Q$ is discharge. Choose the most appropriate match from the options given below:
- CUET (PG) - 2025
- Civil Structural and Transport Engineering
- Open Channel Flow
A compound symmetrical open channel section as shown in the figure has a maximum of critical depth(s).
- GATE CE - 2023
- Fluid Mechanics
- Open Channel Flow
- Want to practice more? Try solving extra ecology questions todayView All Questions
Questions Asked in GATE CE exam
A system of seven river segments is shown. Given: $Q_1=5$ m$^3$/s, $Q_2=15$ m$^3$/s, $Q_4=3$ m$^3$/s (outflow), $Q_6=8$ m$^3$/s; $C_1=8$ kg/m$^3$, $C_2=12$ kg/m$^3$, $C_6=10$ kg/m$^3$. Assume complete mixing at junctions, no gains/losses otherwise, steady state. Find the pollutant concentration in segment $R_7$ (in kg/m$^3$, rounded to two decimals).
- GATE CE - 2023
- Unit processes and operations
