Civil Engineering MCQJE Level Civil Engineering
As per IS 1742, the minimum velocity of flow in a sewer required to prevent deposition of suspended solids (self-cleansing velocity) is:
Environmental EngineeringSewer System DesignHARD
Choose the correct answer
A
0.3 m/s
B
0.6 m/s
C
0.9 m/s
D
1.2 m/s
Correct Answer
B. 0.6 m/s
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IS 1742 prescribes a minimum self-cleansing velocity of 0.6 m/s in sewers. Below this, silt settles causing blockages. Sewers are designed to achieve at least this velocity at one-third of full-bore discharge. Maximum velocity is limited to 3 m/s to prevent erosion.
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