# Civil Engineering - Irrigation

### Exercise :: Irrigation - Section 2

46.

If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

 A. Q = 1.71 BD1/2 B. Q = 1.71 BD C. Q = 1.71 BD3/2 D. Q = 1/71 BD2/3 E. none of these.

Answer: Option C

Explanation:

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47.

If straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the area of its cross-section, is

 A. R(θ + tan θ) B. R(θ + cot θ) C. R2(θ + tan θ) D. R2(θ + cot θ) E. R(θ + tan θ)

Answer: Option D

Explanation:

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48.

Lacy's regime condition is obtained if

 A. silt grade in the channel is variable B. discharge in the channel is variable C. silt charge in the channel is variable D. channel flows in unlimited, incoherent alluvium of the same character as that transported material.

Answer: Option D

Explanation:

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49.

In Montague type fall

 A. a straight glacis is provided B. a circular glacis is provided C. a parabolic glacis is provided D. no glacis is provided.

Answer: Option C

Explanation:

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