The self cleansing velocity for all sewers in India is usually

- 1
  
  less than 1.0 m/sec
- 2
  
  1 m/sec to 1.2 m/sec
- 3
  
  1.5 m/sec to 2.0 m/sec
- 4
  
  3.0 m/sec to 3.5 m/sec

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