Waste Water Engineering
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Vs = 218 (Gs – Gw)d [(3T + 70)/100]
Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw) d [(3T + 70)/100]

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Waste Water Engineering
The sewer pipes

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

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