Civil Engineering - Irrigation

Exercise :: Irrigation - Section 2

21.

Useful soil moisture for plant growth, is

 A. capillary water B. gravity water C. hygroscopic water D. chemical water E. all the above.

Explanation:

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22.

A hydraulic structure is designed to withstand

 A. seepage forces B. hydraulic jump C. hydraulic pressure D. all the above.

Explanation:

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23.

In gravity canals, F.S.L. is

 A. always at the ground level B. always below the ground level C. generally 4 to 5 metres above the ground level D. only a few cm above the ground level.

Explanation:

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24.

If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is

 A. x = r1 d1 B. x = r2 d2 C. x = d1 / r1 D. x = d2 / r2

Explanation:

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25.

The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called

 A. syphon B. super passage C. aqueduct D. super-aqueduct E. syphon aqueduct.