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

all of these
Inverted syphon
Depressed sewer
Sag pipe

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Waste Water Engineering
Nitrogen cycle of sewage, is

Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates

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