Civil Engineering - Irrigation

Exercise :: Irrigation - Section 1

11. 

According to G.W. Pickles the effect of confining the flood water of a river between levee, is to increase

A. rate of flood wave
B. water surface elevation during floods
C. maximum discharge
D. velocity and scouring action
E. surface slope of streams above the leveed portion.

Answer: Option E

Explanation:

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12. 

In a canal syphon, the flow is

A. under atmospheric pressure
B. pipe flow
C. with critical velocity
D. under negative pressure.

Answer: Option B

Explanation:

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13. 

A water-logged land is found suitable for cultivation due to

A. ease of tillage for preparation of the field for optimum condition of germination
B. absence of aeration of soil from root zone of the plant
C. regular supply of water to plants from the water table by capillary action
D. none of these.

Answer: Option D

Explanation:

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14. 

When a canal and a drainage approach each other at the same level, the structure so provided, is

A. an aqueduct
B. a syphon
C. a level crossing
D. inlet and outlet.

Answer: Option C

Explanation:

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15. 

For smooth entry of water in a canal, the angle between head regulator and water is generally kept

A. 80°
B. 90°
C. 110°
D. 120°

Answer: Option C

Explanation:

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