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Irrigation Engineering

Irrigation Engineering
Optimum depth of kor watering for rice is

190 mm
215 mm
165 mm
135 mm

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Irrigation Engineering
To control the silt entry into a distributary at head regulator, King's vanes are provided which are the walls

All listed here
Of R.C.C. or steel plate 8 cm thick
Of height ⅓rd to ¼th the depth of water in the main canal
Spaced at interval of 1½ times their heights

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Irrigation Engineering
In a concrete canal the approximate permissible velocity of water should not exceed

1 m/sec
0.5 m/sec
2 m/sec
1.5 m/sec

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Irrigation Engineering
Lacey's equation for calculating flood discharge in rivers, is

V = 10.8 R2/3 S1/2
V = 10.8 R1/2 S1/2
V = 10.8 R1/3 S2/3
V = 10.8 R2/3 S1/3

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Irrigation Engineering
For the upstream face of an earthen dam, the most adverse condition for stability of slope is

sloughing of slope
sudden drawdown
during construction
steady seepage

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Irrigation Engineering
Generally the weir is aligned at right angles to the direction of the main river current because

It ensures less length of the weir
All of these
It is economical
It gives better discharging capacity

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