Waste Water Engineering
Pick up the incorrect statement from the following for allowing workers to enter sewers

The men entering the manhole should be advised to smoke in the sewer
Proper tests for the presence of poisonous gases must be carried out
The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
Warning signals should be erected

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

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

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