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Irrigation Engineering Practice Test: Cross Drainage Work
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Avg score: 55% Most missed: “What is Lacey’s equation for fixing the approximate value of the required waterw…”
Cross Drainage Work topics include: Cross drainage work design and types, aqueducts and syphon aqueducts types, joints provision and water bars in rcc ducts. Cross drainage work is a structure that carries drainage water from a natural stream across a canal that intercepts the stream. It is constructed when a canal and a natural drain cross, preventing drain water from mixing with canal water.  Cross drainage work is important for irrigation engineering because it: Maintains water flow Prevents water from mixing in the canal and drainage systems Ensures that water bodies do not disrupt... Show more
Irrigation Engineering Practice Test: Cross Drainage Work
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25 Questions

1. Which CD work is generally adopted when the drainage discharge is small and the drain crosses the canal with its bed level equal to or slightly higher than the canal FSL?
2. What is the maximum expansion or contraction allowed for the joint filler material with an initial gap of about 30 mm?
3. The canal water flows freely under gravity in which of the following CD works?
4. The relative bed levels of the canal and the drainage may be changed and manipulated by _________________
5. In a syphon aqueduct provided with a pucca bottom floor, the uplift will occur on __________
6. Which of the following is not a movement joint?
7. In reinforced concrete floors, the movement joints should normally be spaced at a maximum spacing of ____________
8. What is the most common metal used for water stops?
9. To reduce the cost of the CD works we resort to _____
10. A Super passage is the reverse of ______________
11. The type of canal alignment which involves maximum CD works is a ______________
12. Which of the following is usually adopted for contraction and construction joints?
13. Which of the following is a movement joint with complete discontinuity in both reinforcement and concrete and intended to accommodate either expansion or contraction of the structure?
14. A siphon aqueduct is constructed at a canal crossing site where drainage HFL was 212.2 m by allowing an afflux of 0.4 m at high flood discharge. At this site, the water level downstream of the crossing at the same high flood will be _________
15. What is Lacey’s equation for fixing the approximate value of the required waterway for the drain?
16. Which of the following is a disadvantage of CD works carrying drainage over the canal?
17. Which of the following CD works carry drainage over the canal?
18. What provides a permanent watertight seal during the whole range of joint movement?
19. In order to reduce the CD works, the artificial canals are generally aligned along the ridgeline.
20. Which of the following is a movement joint with deliberate discontinuity but no initial gap?
21. The maximum permissible reduction in the waterway from Lacey’s perimeter is _______
22. Which of the following statement is not correct about canal syphon?
23. Which of the following is a disadvantage of CD works carrying the canal over the discharge?
24. Which of the following can be used as support for an effective joint sealing compound in floor and floor joints?
25. The greater is the fluming, the greater is the length of upstream and downstream transition wings.