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WorksheetsDAY 30 KWA (Irrigation Canals CROSS DRAINAGE )
Total questions: 15
Worksheet time: 9mins
The balancing depth of a canal section corresponds to the condition when —
Seepage losses equal inflow losses
Cross-sectional area is maximum
Volume of cutting equals volume of filling
Canal discharge is maximum
A canal aligned roughly at right angles to the contours of the country is called —
Ridge canal
Contour canal
Side-slope canal
Watershed canal
The saturation line (hydraulic gradient line) in a canal bank separates —
Flowing and stagnant water zones
Wet and dry zones of the bank
Silting and scouring zones
Lined and unlined portions
Which lining material provides about 95 % seepage control and best hydraulic performance?
Brick lining
Cement-concrete lining
Asphaltic lining
Clay-puddle lining
The berm width for a canal in partial cutting and partial filling is approximately —
3D
2D
1.5D
0.5D
In a rigid module (modular outlet), discharge —
Depends on water level in distributor
Depends on water level in field channel
Depends on difference in both levels
Is independent of both levels
The flow condition in an aqueduct is —
Canal and drainage both under pressure
Canal under pressure, drain open channel
Canal open channel, drain open channel
Canal open, drain pressure flow
Which of the following falls is obsolete due to high construction cost and maintenance?
Ogee fall
Rapid fall
Stepped fall
Inglis fall
The top width of canal banks is generally kept not less than —
0.6 m
1 m
1.5 m
2 m
The bed bars in unlined canals are provided —
To increase depth of flow
To support lining
As reference for bed level to check silting/scouring
For energy dissipation
Which statement about non-alluvial canals is correct?
Flow velocity must be kept very low to avoid scouring
Constructed in hard strata; scouring rarely occurs
Require protective pitching throughout
Flow velocity always critical
A super passage is provided when —
Canal FSL > drainage HFL
Canal bed < drainage bed
Canal bed = drainage bed
Canal bed > drainage bed
The berm width in a canal in full filling condition is approximately (a) .
The balancing depth of canal is that depth at which ________ = ________.
(a)
The structure provided to discharge excess water from a canal to a drain is called a (a) .
