Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.01 mm
Less than 0.05 mm
Greater than 0.1 mm
Less than 0.1 mm

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Waste Water Engineering
In case of sewer lines

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

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