# Civil Engineering - Irrigation

### Exercise :: Irrigation - Section 2

31.

In a barrage, the crest level is kept

 A. low with large gates B. high with large gates C. high with no gates D. low with no gates.

Explanation:

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32.

For a standing crop, the consumptive use of water is equal to the depth of water

 A. transpired by the crop B. evaporated by the crop C. transpired and evaporated by the crop D. used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil.

Explanation:

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33.

The state of the soil when plants fail to extract sufficient water for their requirements, is

 A. maximum saturated point B. permanent wilting point C. ultimate utilisation point D. none of these.

Explanation:

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34.

The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is

 A. 8 cm B. 10 cm C. 12 cm D. 14 cm E. 16 cm

Explanation:

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35.

Solution of Laplacian equation in three dimensions of water in a syphon, is done by

 A. analytical method B. Khosla's method C. method of relaxation D. Unwin's method.