Waste Water Engineering
In detritus tanks,

Detention period is kept 3 to 4 minutes
Organic and inorganic materials are separated
All listed here
Flow velocity is kept 0.09 m/sec

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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 men entering the manhole should be advised to smoke in the sewer
The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes

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