Waste Water Engineering
The sewer pipes

Carry sewage as gravity conduits
All listed here
Should resist the wear and tear caused due to abrasion
Are designed for generating self-cleansing velocities at different discharge

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

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