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Irrigation Engineering

Irrigation Engineering
The water utilizable by plants is available in soils mainly in the form of

capillary water
gravity water
chemical water
hydroscopic water

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Irrigation Engineering
If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is

x = r1 d1
x = d1 / r1
x = r2 d2
x = d2 / r2

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Irrigation Engineering
If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be

30 minutes
60 minutes
20 minutes
15 minutes

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Irrigation Engineering
The most suitable material for the central impervious core of a zoned embankment type dam is

coarse sand
clay mixed with fine sand
silty clay
clay

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Irrigation Engineering
The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be

35 m3/sec
30 m3/sec
25 m3/sec
20 m3/sec

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Irrigation Engineering
Cyclonic precipitation is caused by lifting of an air mass due to

pressure difference
temperature difference
All of these
natural topographical barriers

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