The self-cleansing velocity of water flowing through pipe lines, is
A. 2 metres/sec
B. 1 metre/sec
C. 0.5 metre/sec
D. 0.25 metre/sec
Answer: Option A
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In sewer it is generally 0.7 to 0.9 m/sec.
But in case of pipe, it is slightly more and usually taken as 2 m/sec.