An 'escape' in an irrigation canal system is provided to:
Choose the correct answer
Allow water to flow back to reservoir
Safely dispose of excess water — prevents overtopping by automatically or manually releasing surplus flow
Measure the flow rate in canal
Connect two parallel canals
Correct Answer
B. Safely dispose of excess water — prevents overtopping by automatically or manually releasing surplus flow
Why is this the answer?
Escape: structure provided in canal bank or at end of canal to dispose of excess water safely. Types: (1) Tail escape (at tail end of distributary) — prevents waterlogging at tail when distribution is closed; (2) Surplus escape (wasteway) — automatic if water rises above design level; (3) Scouring escape — below regulator for silt flushing. Prevents canal overtopping and breaching.
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