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Irrigation Engineering

Irrigation Engineering
The depth of rice root zone, is

80 cm
60 cm
50 cm
90 cm

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Irrigation Engineering
The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be

972 hectares/m3/sec
1172 hectares/m3/sec
637 hectares/m3/sec
837 hectares/m3/sec

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Irrigation Engineering
For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of

rabi and kharif or sugarcane
rabi or kharif or sugarcane
rabi or kharif
rabi and sugarcane or kharif and sugarcane

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Irrigation Engineering
Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as

low sodium water
medium sodium water
very high sodium water
high sodium water

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Irrigation Engineering
If Δ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is

D = Δ (8.64 D/B)
Δ = (8.6 B/D)
B = Δ (8.64 B/D)
D = (8.6 Δ/B)

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Irrigation Engineering
If the straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the perimeter of the canal is

R (θ + tan θ)
2R (θ + tan θ)
2R (θ + cos θ)
R (θ + cos θ)

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