The 'Full Supply Level' (FSL) in an irrigation canal is the:
Choose the correct answer
Maximum flood level during peak rainfall
Water level when canal flows at full design discharge — must be high enough to command the service area by gravity
Minimum water level during summer
Water level at the headworks only
Correct Answer
B. Water level when canal flows at full design discharge — must be high enough to command the service area by gravity
Why is this the answer?
FSL: the water level in the canal corresponding to the full design discharge (FSD = Full Supply Discharge). Above FSL: freeboard zone. Below FSL: canal cannot deliver full demand. The FSL is designed to be high enough to command (irrigate by gravity) the target area by gravity flow through outlets. Lining of canal doesn''t change FSL.
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