Environmental Engineering
The self cleansing velocity for all sewers in India is usually

3.0 m/sec to 3.5 m/sec
1.5 m/sec to 2.0 m/sec
1.0 m/sec to 1.2 m/sec
Less than 1.0 m/sec

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Environmental Engineering
The polluted water is one which

Contains pathogenic bacteria
Is safe and suitable for drinking and domestic use
Consists of undesirable substances rendering it unfit for drinking and domestic use
Is contaminated

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