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Irrigation Engineering

Irrigation Engineering
A raingauge should preferably be fixed

in a closed space
in an open space
near the building
under the tree

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Irrigation Engineering
The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by

(0.99)10
1 – (0.99)10
(0.9)00
l-(0.9)100

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Irrigation Engineering
Process of meandering is due to

All listed here
Relative erodibility of the bed and banks
Sediment load of streams
Discharge and hydraulic properties of streams

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Irrigation Engineering
Silt excluders are constructed on the

river bed downstream of head regulator
river bed upstream of head regulator
canal bed upstream of head regulator
canal bed downstream of head regulator

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Irrigation Engineering
In case of a trapezoidal notch fall

Splay downstream from the notch section is 22½°
Splay upstream from the notch section is 45°
Top length of the piers should not be less than their thickness
All listed here

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

silty clay
clay
clay mixed with fine sand
coarse sand

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