# Civil Engineering - Irrigation

### Exercise :: Irrigation - Section 3

16.

Effective precipitation for a crop may be defined as

 A. total precipitation minus the loss due to evaporation B. total precipitation minus the loss due to infiltration C. total precipitation during the crop period D. available water stored in soil within root zone of the crop.

Explanation:

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17.

If average particle size of the silt in millimetres is m, the Lacey's silt factor f is proportional to

 A. m B. m3 C. m1/2 D. m1/3 E. m2/3

Explanation:

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18.

Lane's weighted creep theory assumes

 A. equal weightage to horizontal and vertical creeps B. double weightage to horizontal creep and one weightage to vertical creep C. triple weightage to horizontal creep and one weightage to vertical creep D. triple weightage to vertical creep and one weightage to horizontal creep E. double weightage to vertical creep and one weightage to horizontal creep.

Explanation:

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19.

Disposal of extra excavated earth of canals, is utilised to provide a spoil bank on

 A. left side B. right side C. both sides D. all the above.

Explanation:

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20.

If A is the area of the surface, x is the depth of its C.G. from the surface of the water and ω is the density of water, then

 A. total pressure on the surface is equal to ω x B. depth of the point at which total pressure acts is equal to its moment of inertia divided by A x C. depth of the centre of pressure is 2/3H vertically below the surface D. all the above.