Civil Engineering MCQJE Level Civil Engineering
The minimum self-cleansing velocity in a sewer to prevent silt deposition is approximately:
Environmental EngineeringEnvironmental EngineeringMEDIUM
Choose the correct answer
A
0.3 m/s
B
0.9 m/s
C
3.0 m/s
D
0.1 m/s
Correct Answer
B. 0.9 m/s
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Self-cleansing velocity prevents deposition of solids in sewer: minimum 0.9 m/s (some references 1.0 m/s at design flow). At this velocity, drag force on particles exceeds their settling tendency. Gradient of sewer is designed to achieve this velocity at least once daily (full-flow condition). Minimum gradient: 1 in 60 for large sewers.
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