Waste Water Engineering
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

0.05554 cumec
0.05552 cumec
0.0556 cumec
0.05556 cumec

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

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

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