Waste Water Engineering
The settlement of a particle in sedimentation tank, is affected by

All listed here
Velocity of flow
Viscosity of water
Size and shape of solid

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Waste Water Engineering
The sewers

Must be laid at least 2 to 3 m deep to collect /water from the basements
All listed here
Must flow under gravity ½ to ¾ full
Must be of adequate size to avoid over flow

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