Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Under estimates of maximum and average flows
Unexpected large scale infiltration of stream water
Unexpected increase in the population
All of these

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Waste Water Engineering
Skimming tanks are

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

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