Exercise: Irrigation

Questions for: Irrigation

According to G.W. Pickles the effect of confining the flood water of a river between levee, is to increase
A:
rate of flood wave
B:
water surface elevation during floods
C:
maximum discharge
D:
velocity and scouring action
Answer: E
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Retrogression of the bed level of a river downstream a weir, occurs due to
A:
heavy impact of water
B:
increase of the bed level
C:
less percentage of silt
D:
soft soil strata.
Answer: C
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Attracting groynes are built
A:
perpendicular to the bank
B:
inclined down stream
C:
inclined up stream
D:
none of these.
Answer: B
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The measure to remove water logging of land, is
A:
to reduce percolation from canals and water courses
B:
to increase outflow from the ground water reservoir
C:
both (a) and (b)
D:
neither (a) nor (b)
Answer: C
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F.S.L. of a canal at its head with respect to parent channel is kept
A:
at the same level
B:
15 cm lower
C:
15 cm higher
D:
none of these.
Answer: B
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