Waste Water Engineering
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

Glazed bricks sewers
Stone ware sewers
Cement concrete sewers
Cast iron sewers

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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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