For efficient working of a sewer it must be ensured that...

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

A. Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

B. A maximum velocity of 0.90 m/sec, is maintained at its maximum flow

C. Both (A) and (B)

D. Neither (A) nor (B)

Answer: Option C

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