# Civil Engineering - Irrigation

### Exercise :: Irrigation - Section 3

31.

In a syphon aqueduct

 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.

Explanation:

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32.

Which one of the following statements is correct ?

 A. The canal system and the drainage system are complementary B. The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land C. The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream D. All the above.

Explanation:

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33.

Garnett's diagrams are used for graphical solution of design equations of a canal by

 A. Lacey's theory B. Kennedy's theory C. Gibb's theory D. Lindlay theory.

Explanation:

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34.

A current meter measures the velocity of flow, if it is held

 A. on the surface of water B. at the bottom of channel C. at any point within the cross-section D. none of these.

Explanation:

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35.

In a concrete canal the approximate permissible velocity of water should not exceed

 A. 0.5 m/sec B. 1 m/sec C. 1.5 m/sec D. 2 m/sec E. 2.5 m/sec