Waste Water Engineering
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

Inverted syphon
Depressed sewer
all of these
Sag pipe

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

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

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