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Irrigation Engineering

Irrigation Engineering
The downstream expansion head of a guide bank is extended to subtend an angle at the centre, equal to

30°
45°
90°
60°

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Irrigation Engineering
The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are
i) Water pressure
ii) Self weight
iii) Uplift
iv) Pressure due to earthquake
The correct answer is

Only (ii)
(i), (ii), (iii) and (iv)
(i), (ii) and (iv)
(i), (ii) and (iii)

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Irrigation Engineering
Variability of rainfall is
i) largest in regions of high rainfall
ii) largest in coastal areas
iii) largest in regions of scanty rainfall
The correct answer is

(i) and (ii)
only (iii)
only (i)
(ii) and (iii)

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Irrigation Engineering
According to Bligh's creep theory, percolating water flows along

Straight path under the foundation of the dam
None of these
The outline of the base of the foundation of the dam
Circular path under the foundation of the dam

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Irrigation Engineering
According to Kennedy, the critical velocity (V₀) in meters in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).

V₀ = 0.55 mD0.64
V₀ = 0.55 mD0.54
V₀ = 0.84 mD0.54
V₀ = 0.84 mD0.64

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

m3
m2/3
m1/2
m1/3

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