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WorksheetsDay 64-worksheet-PWD-Irrigation-River engineering
Total questions: 15
Worksheet time: 10mins
The purpose of under-sluices in diversion headworks is
To divert flood water into canal
To control the entry of silt into canal
To raise water level
To reduce afflux
A barrage differs from a weir mainly because
Barrage uses shutters/gates to raise water level
Barrage has higher crest
Weir is costlier than barrage
Barrage cannot control silt
Divide wall in a diversion headwork is provided to
Store flood water
Separate weir from under-sluices
Reduce uplift pressure
Provide fish ladder support
Which of the following is a river training work?
Canal head regulator
Silt excluder
Guide bank
Divide wall
The stage of river most suitable for diversion headworks is
Rocky stage
Delta stage
Trough stage
Flood stage
Lane’s weighted creep theory gives 1/3 weightage to horizontal creep.
True
False
Mark True or False: Khosla’s theory treats intermediate sheet piles as fully effective.
True
False
The rise in maximum flood level due to a weir obstruction is called (a) .
The structure controlling flow into the canal from upstream is the (a) .
The structure that removes silt from water after entering the canal is the (a) .
Bligh’s creep theory assumes that loss of head is proportional to ________.
Creep length
Permeability
Exit gradient
Sheet pile depth
Lane’s theory applies a weight factor of (a) to horizontal creep length.
The lateral shift of a river due to deposition on the convex side is part of the (a) process.
Choose the odd one out:
Guide banks
Marginal bunds
Divide wall
Spurs
Which of the following reduce exit gradient? Select all that apply.
Downstream cutoff
Increasing floor length
Providing upstream glacis
Using Khosla’s pressure curves
