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Irrigation Engineering

Irrigation Engineering
The depth of rice root zone, is

60 cm
90 cm
80 cm
50 cm

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Irrigation Engineering
If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

t = (h + 1)/(G + t)
t = (h - 1)/(G + t)
t = (h - 1)/(G - t)
t = (h + 1)/G

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Irrigation Engineering
Fundamental momentum equation for a hydraulic jump, is

D₂² - D₁² = (2q/g) × (V - V₂)
D₁² - D₂² = (2q/g) × (V₂ - V₁)
D₁² + D₂² = (2q/g) × (V₂ - V₁)
D₁² - D₂² = (2q/g) × (V₁ - V₂)

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Irrigation Engineering
For smooth entry of water in a canal, the angle between head regulator and water is generally kept

110°
90°
80°
120°

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Irrigation Engineering
The most suitable chemical which can be applied to the water surface for reducing evaporation is

Methyl alcohol
Ethyl alcohol
Cetyl alcohol
Butyl alcohol

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Irrigation Engineering
A fall which maintains its depth, is

A low weir fall
A trapezoidal notch fall
All listed here
A rectangular notch fall

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