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Irrigation Engineering Practice Test: Spillways, Energy Dissipators and Spillway Gates
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Spillways are hydraulic structures that divert excess water from a reservoir after it has reached its maximum capacity. Energy dissipators are structures that reduce the energy of water flow after it passes through a spillway.  Here are some types of spillways: Chute spillway: A spillway that carries surplus water from upstream to downstream through a steeply sloped open channel. It's usually built at the end of a dam or separately in a natural saddle in the riverbank. Chute spillways are useful for gully head control and can be used for drops of up to 5–6 meters. Ogee spillway: Allows for... Show more
Irrigation Engineering Practice Test: Spillways, Energy Dissipators and Spillway Gates
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25 Questions

1. The discharge passing over an ogee spillway per unit length of its apex line is proportional ___________________
2. If the head of the water over the spillway is less than the design head, then ________________
3. The type of spillway which is provided on narrow valleys where no side flanks are available is ____________________
4. A shaft spillway is located _______________________
5. A ski-jump bucket is also known as _____________________
6. In the vertical Stoney spillway gate, the rollers are placed between the ______________
7. When the TWC lies below the JHC at all discharges, the problem can be solved by which of the following provisions?
i. Constructing a sloping apron above the river bed
ii. Provision of roller bucket type of energy dissipator
iii. Provision of a ski-jump bucket
iv. A sloping apron below the river bed
v. Construction of a subsidiary dam
vi. A sloping apron partly above and partly below the river bed
8. Whenever the slope of chute changes from steeper to milder ____________________ curve shall be provided.
9. The safety valve of a dam is its __________________
10. The greater is the divergence from the streamline flow, greater is the contraction coefficient.
11. When the Froude number is in the range of 2.5 to 4.5, the jump is ____________________
12. The device which does not help in energy dissipation at the bottom of a hydraulic structure over which water spills is ________________
13. The minimum slope of the chute is governed by the condition that _____________
14. Which of the following stilling basin help in stabilizing the flow and improve the jump performance?
15. A troublesome and oscillating hydraulic jump is normally met in cases of _____________
16. The structure which is not used in a shaft spillway is ________________
17. The allowable maximum negative head on an average is equal to __________
18. Calculate the freeboard for the top levels of the side walls if the mean velocity of water in the chute reach is 3.5 m/s and the mean depth of water in the chute reach under consideration is 4.7 m.
19. In a fixed roller of a spillway gate, the rollers are attached to the __________________
20. The Froude number of a hydraulic jump is 5.5. The jump can be classified as ____________
21. Standard USBR stilling basin-II is useful for energy dissipation at the bottom of the overflow structure, if the approaching Froude number is ________________
22. A siphon spillway is sufficiently independent of the water surface elevation of the reservoir.
23. If the operating head on an ogee spillway is more than the design head then ________________
24. The siphons installed over overflow dams constitute what are known as __________________
25. According to US Army Corps, the u/s profile of ogee spillway extends up to _______________

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