When the tail-water depths in the river downstream of a spillway are quite low s

Question

When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________

Options:

A . a roller bucket

B . a ski-jump bucket

C . either roller or ski-jump bucket

D . a sloping apron

Answer: Option B
Answer: (b).a ski-jump bucket

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Question 1. The most ideal condition for energy dissipation in the design of spillways is the one when the tail-water rating curve c....curve coincides with the jump rating curve at all discharge.

Question 2. The device which does not help in energy dissipation at the bottom of a hydraulic structure over which water spills is _....of a hydraulic structure over which water spills is ________________

Question 3. A sloping apron is provided partly above the river bed and partly below the river bed in case of _______________________....and partly below the river bed in case of ____________________________

Question 4. A troublesome and oscillating hydraulic jump is normally met in cases of _____________....

Question 5. When the TWC lies below the JHC at all discharges, the problem can be solved by which of the following provisions? i. C....sloping apron partly above and partly below the river bed

Question 6. A very steady and stable hydraulic jump is usually formed in the flows involving the approaching Froude number in the ra....involving the approaching Froude number in the range of _____________________

Question 7. Standard USBR stilling basin-II is useful for energy dissipation at the bottom of the overflow structure, if the approac....the overflow structure, if the approaching Froude number is ________________

Question 8. An ogee spillway of a concrete gravity dam having FRL of 328 m and MWL of 340 m is provided with vertical gates between ....to the actual reservoir level of 331.0 m will be_____________

Question 9. Which of the following gate is also called flush boards?....

Question 10. Which one of the following gate is not suitable for curved crests?....

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