Irrigation Engineering
In gravity canals, F.S.L. is

Always below the ground level
Generally 4 to 5 metres above the ground level
Always at the ground level
Only a few cm above the ground level

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Irrigation Engineering
Lacy's regime condition is obtained if

Channel flows in unlimited, incoherent alluvium of the same character as that transported material
Silt charge in the channel is variable
Discharge in the channel is variable
Silt grade in the channel is variable

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