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Irrigation Engineering

Irrigation Engineering
If the critical shear stress of a channel is XC, then the average value of shear stress required to move the grain on the bank is

1.33 TC
0.75 TC
XC
0.5 XC

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Irrigation Engineering
When surface of transpiration is submerged under water, then potential evapotranspiration is

much less than evapotranspiration
equal to evapotranspiration
much more than evapotranspiration
equal to or less than evapotranspi-ration

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Irrigation Engineering
Instantaneous unit hydrograph is a hydrograph of
i) unit duration
ii) unit rainfall excess
iii) infinitely small duration
iv) infinitely small rainfall excess
The correct answer is

(ii) and (iii)
(i) and (ii)
(iii) and (iv)
(i)and(iv)

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Irrigation Engineering
Infiltration capacity

changes with both time and location
is a constant factor
changes with time
changes with location

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Irrigation Engineering
A river bend characterized by silting

silting on convex side
scouring on concave side and silting on convex side
scouring on concave side
scouring on convex side and on concave side

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Irrigation Engineering
In case of non-availability of space due to topography, the most suitable spillway is

ogee spillway
straight drop spillway
shaft spillway
chute spillway

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