In a syphon aqueduct drainage passes over the canal and F.S.L. of the canal is b

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Question
In a syphon aqueduct
Options
A. drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough
B. drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough
C. canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough
D. canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough.

Correct Answer

canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough

Irrigation problems

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1. The most suitable section of a lined canal, is
Options
A. triangular section with circular bottom for small canals
B. trapezoidal section with rounded corners for large canals
C. rectangular section with rounded corners for large canals
D. both (a) and (b)
E. both (a) and (c)

2. The ratio of the rate of change of discharge of an outlet to the rate of change in level of water surface in a distributary at its normal depth, is known as
Options
A. efficiency
B. sensitivity
C. flexibility
D. modular limit.

4. A counter berm is
Options
A. a horizontal benching provided on the inside slope
B. a horizontal benching provided on the outside slope
C. a vertical benching provided on the outer edge of the bank
D. a vertical benching provided on the inner edge of the bank.

5. In case of a trapezoidal notch fall
Options
A. top width of the notch is kept between 3/4 th of full water depth above the sill of the notch
B. top length of the piers should not be less than their thickness
C. splay up stream from the notch section is 45�
D. splay down stream from the notch section is
E. all the above.

6. A current meter measures the velocity of flow, if it is held
Options
A. on the surface of water
B. at the bottom of channel
C. at any point within the cross-section
D. none of these.

7. Pick up the correct statement from the following
Options
A. Escapes are essential safety valves in a canal system
B. The capacity of escapes should not be less than the capacity of the canal at its location
C. The escapes must lead the surplus water to natural drainages
D. The escapes are aligned to take advantage of contours of lower values
E. All the above.

8. According to Kennedy, the critical velocity (V₀) in metres in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).
Options
A.
B.
C.
D.

9. Pick up the correct sequence of the part of a canal system from the following
Options
A. Head work-distributary-branch canal-minor
B. Head works-main canal-branch canal-dis-tributary-minor
C. Head works-main canal-branch canal-minor-distributary
D. Heads works-branch canal-main canal distributary, minor.

10. Lane's weighted creep theory assumes
Options
A. equal weightage to horizontal and vertical creeps
B. double weightage to horizontal creep and one weightage to vertical creep
C. triple weightage to horizontal creep and one weightage to vertical creep
D. triple weightage to vertical creep and one weightage to horizontal creep
E. double weightage to vertical creep and one weightage to horizontal creep.

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