Waste Water Engineering
In case of Imhoff tanks,

All of these
The velocity of flow is restricted to 0.30 m/minute
Detention period is 2 hours
The shape is rectangular

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

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
Proper tests for the presence of poisonous gases must be carried out

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