A 'canal fall' (drop structure) is constructed in a canal to:
Choose the correct answer
Raise the water level in the canal
Safely dissipate the energy where ground slope exceeds canal design slope — drops water level without erosion
Increase the canal discharge
Remove silt from canal
Correct Answer
B. Safely dissipate the energy where ground slope exceeds canal design slope — drops water level without erosion
Why is this the answer?
Canal fall: masonry or concrete structure to safely lower the water level in a canal when the natural ground slope is steeper than the canal bed slope. Without a fall, the canal would erode. Types: ogee fall, rapid fall, glacis fall, straight glacis (Sarda-type). Energy dissipation on downstream using hydraulic jump or cistern.
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