Waste Water Engineering
It is customary to design a sewer for D.W.F. on the basis of

Four times the average demand
Average demand
Thrice the average demand
Twice the average demand

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Waste Water Engineering
The sewer pipes

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

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Waste Water Engineering
In case of sewer lines

Water test is carried out to check water tightness of the joints
Obstruction test is carried out with the help of smooth ball of diameter 13 mm
Test for straightness is carried out with the help of a lamp and mirror
All listed here

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