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Irrigation Engineering

Irrigation Engineering
The depth of rice root zone, is

50 cm
60 cm
80 cm
90 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 = (h - 1)/(G - t)
t = (h - 1)/(G + t)
t = (h + 1)/(G + t)

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Irrigation Engineering
If the irrigation efficiency is 80%, conveyance losses are 20% and the actual depth of watering is 16 cm, the depth of water required at the canal outlet, is

10 cm
15 cm
25 cm
20 cm

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Irrigation Engineering
The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as

water application efficiency
water conveyance efficiency
water use efficiency
None of these

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Irrigation Engineering
If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that

None of these
reservoir was not full at the beginning
demand cannot be met by inflow
both (A) and (B)

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Irrigation Engineering
The relation between probability (P) and recurrence interval (T) is given by

P/T2 = 1
PT = 1
P/T = 1
PT2 = 1

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