Waste Water Engineering
In sewers the highest non-scouring velocity is achieved in

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

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Waste Water Engineering
For treating the sewage of a large city, you will recommend

A sedimentation tank and an activated sludge treatment plant
A plant consisting of Imhoff tanks with low rate trickling filters
None of these
Sedimentation tanks with high rate trickling filters

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