The 'retrogression' in a canal below a head regulator means:
Choose the correct answer
Rising of water level above FSL
Lowering of canal bed downstream due to silt-free water from reservoir scouring the unprotected canal bed
Silt deposition blocking the canal
The canal gate failing to open
Correct Answer
B. Lowering of canal bed downstream due to silt-free water from reservoir scouring the unprotected canal bed
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Retrogression: lowering of bed level of canal downstream due to clear water (no silt) flowing below a dam/barrage head works. Clear water released from reservoir has high energy and scouring capacity → erodes canal bed → bed level falls → water level falls → command area disrupted. Solution: periodic desilting of reservoir, sediment bypass, or sediment flushing below dam.
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