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Irrigation Engineering

Irrigation Engineering
The depth of rice root zone, is

90 cm
80 cm
50 cm
60 cm

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Irrigation Engineering
If d is the depth of the aquifer through which water is flowing, then the relationship between permeability k and transmissible T is given by

T = kd
k= VTd
T= Vkd
T = k/d

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Irrigation Engineering
The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65 cm is 150 square km. The average depth of annua! precipitation over the above basin of 250 square km will be

50 cm
56 cm
60 cm
55 cm

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Irrigation Engineering
If V₀ is the critical velocity of a channel, its silt transporting power, according to Kennedy, is proportional to

V₀5/2
V₀1/2
V₀7/2
V₀3/2

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Irrigation Engineering
The sensitivity of a rigid module is

1
between zero and one
zero
infinity

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Irrigation Engineering
V and R are the regime mean velocity and hydraulic mean depth respectively in meters. Lacey's silt factor f is

5V²/2R
2V²/√3 R
3V²/4R
2V²/5R

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