Waste Water Engineering
In sewers the velocity of flow should not be

Less than the self-cleansing velocity
Less than 10 m/sec
More than 20 m/sec
More than the self-cleansing velocity

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Waste Water Engineering
Dilution method of disposing of sewage, is not preferred to

When the diluting water is having flow currents
When sewage is fresh
When diluting water is used for water supply near the point of sewage disposed
When diluting water has high dissolved oxygen content

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