Exercise: Irrigation

Questions for: Irrigation

Cross regulators in main canals are provided
A:
to regulate water supply in the distributaries
B:
to increase water head upstream when a main canal is running with low supplies
C:
to overflow excessive flow water
D:
none of these.
Answer: B
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The ratio of the rate of change of discharge of an outlet and parent channel, is known as
A:
efficiency
B:
sensitivity
C:
flexibility
D:
modular limit.
Answer: C
Flexibility: It provides a criteria for judging the behaviour of modules and semi-modules. It is generally denoted by letter 'F'. It is the ratio of the rate of change of outlet discharge to the rate of change of discharge of the parent channel.
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In rigid module, the discharge
A:
is independent of water levels in the distributary and water course
B:
depends upon the water level in distributary
C:
depends upon the water level in the water course
D:
depends upon the water levels of both, i.e. distributary and water course
Answer: A
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The uplift pressure on the roof of an inverted syphon, is maximum when
A:
drain in running dry
B:
canal is running dry
C:
canal is running with F.S.L.
D:
drain is running with H.F.L.
Answer: D
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If Dc is the critical depth, D is the depth of water down stream and HL is the total head loss at the cistern of a vertical fall, the depth x of the cistern below the bed level down stream suggested by Blench, is
A:
B:
C:
D:
Answer: B
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