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Question
The self cleansing velocity for all sewers in India is usually
Options:
A .  Less than 1.0 m/sec
B .  1.0 m/sec to 1.2 m/sec
C .  1.5 m/sec to 2.0 m/sec
D .  3.0 m/sec to 3.5 m/sec
Answer: Option B

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