Waste Water Engineering
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

225 mm dia
All of these
150 mm dia
100 mm dia

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Waste Water Engineering
Skimming tanks are

Improved version of grit chambers
Tanks provided with self- cleansing screens
Used to remove the grease and oil
Those from which sludge is skimmed out

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