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The self cleansing velocity for all sewers in India is usually_________________?

/ Environmental Engineering / By
The self cleansing velocity for all sewers in India is usually_________________?

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