Waste Water Engineering
For efficient working of a sewer, it must be ensured that

A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
Both (A) and (B)
Neither (A) nor (B)
Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

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Waste Water Engineering
Skimming tanks are

Used to remove the grease and oil
Tanks provided with self- cleansing screens
Improved version of grit chambers
Those from which sludge is skimmed out

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