Exercise: Irrigation

Questions for: Irrigation

If the straight sides of a triangular section of a lined canal with circular bottom of radius D, make an angle θ with horizontal, the hydraulic mean depth is
A:
D
B:
D/2
C:
D/3
D:
D/4
Answer: B
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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: C
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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: D
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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)
Answer: D
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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
Answer: C
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