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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. Calculate the value of hydraulic mean radius for a channel designed by Lacey’s theory which has a mean velocity of 1m/sec. The silt factor can be taken as unity.
2. Which of the following wings protect the earthen slopes of the canal and also guide the drainage water?
3. What provides a permanent watertight seal during the whole range of joint movement?
4. The relative bed levels of the canal and the drainage may be changed and manipulated by _________________
5. Which of the following CD works carry drainage over the canal?
6. A partial contraction joint is the one in which?
7. In order to reduce the CD works, the artificial canals are generally aligned along the ridgeline.
8. In which of the following arrangement, the perennial drainage discharge is advantageously used?
9. 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?
10. The use of sealing compounds for vertical joints is very successful.
11. In case of the sealing joint, the lower part of the joint is occupied by joint filler.
12. The greater is the fluming, the greater is the length of upstream and downstream transition wings.
13. In reinforced concrete floors, the movement joints should normally be spaced at a maximum spacing of ____________
14. Which of the following is usually adopted for contraction and construction joints?
15. A Super passage is the reverse of ______________
16. Joint sealing compounds are impermeable ductile materials which are required to ___________________
17. The selection of the CD works depends on?
i. Selecting canal alignment
ii. Position of water-table and availability of dewatering equipment
iii. Suitability of soil for embankment
iv. Availability of funds
18. The maximum permissible reduction in the waterway from Lacey’s perimeter is _______
19. What is Lacey’s equation for fixing the approximate value of the required waterway for the drain?
20. 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?
21. Which of the following statement is not correct about canal syphon?
22. 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 _________
23. Which of the following is a disadvantage of CD works carrying the canal over the discharge?
24. In a siphon aqueduct, the worst condition of uplift on the floor occurs when ________
25. The permissible velocity through the barrels is generally limited to _____________