Waste Water Engineering
When drainage to sewage ratio is 20, the peak dry weather flow is

Slightly less than 5% of the design discharge
None of these
Slightly more than 5% of the design discharge
20% of the design discharge

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Waste Water Engineering
Skimming tanks are

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

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