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Irrigation Engineering

Irrigation Engineering
The width of a dowla is generally kept between 30 to 60 cm and its height above the road level should invariably be more than

40 cm
10 cm
30 cm
20 cm

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Irrigation Engineering
According to Lacey, in regime conditions

Neither (a) nor (b)
Both (a) and (b)
Entire cross-section of the channel is generated at all points by the forces normal to the
Silt is kept in suspension by vertical components of eddies

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Irrigation Engineering
Meandering of a river generally occurs, in

Delta stage
Rocky stage
Trough stage
Boulder stage

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Irrigation Engineering
The meander pattern of a river is developed by

Average discharge
Critical discharge
Dominant discharge
Maximum discharge

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Irrigation Engineering
If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is

Q = 1.71 BD1/2
Q = 1.71 BD
Q = 1.71 BD3/2
Q = 1/71 BD2/3

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Irrigation Engineering
Cross regulators in main canals are provided

To increase water head upstream when a main canal is running with low supplies
To overflow excessive flow water
To regulate water supply in the distributaries
None of these

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