Civil Engineering - Irrigation

Exercise :: Irrigation - Section 3

1. 

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
E. D/5

Answer: Option B

Explanation:

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2. 

If water table is comparatively high, the irrigation canal becomes useless, due to

A. large amount of seepage
B. water logging of the cultivated areas
C. uncertain water demand
D. spread of malaria
E. all the above.

Answer: Option E

Explanation:

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3. 

A river is said to be of

A. aggrading type if it builds up its bed to a certain slope
B. degrading type if it cuts its bed to a certain slope
C. meandering type if it flows in sinuous curve
D. all the above.

Answer: Option D

Explanation:

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4. 

A land is said to be water-logged if its soil pores within

A. a depth of 40 cm are saturated
B. a depth of 50 cm are saturated
C. root zone of the crops are saturated
D. all the above.

Answer: Option C

Explanation:

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5. 

In case of a trapezoidal notch fall

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.

Answer: Option E

Explanation:

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