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

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

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Irrigation Engineering
A counter berm is

A vertical benching provided on the inner edge of the bank
A horizontal benching provided on the inside slope
A horizontal benching provided on the outside slope
A vertical benching provided on the outer edge of the bank

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