The Self-Cleansing Velocity standardly required in municipal sewers to prevent deposition of solid silt is approximately:
A0.15 to 0.30 m/s
B0.60 to 0.90 m/s
C2.50 to 3.00 m/s
D5.00 m/s
Explanation
To prevent organic and inorganic solids from settling, gravity sewers are designed for a minimum self-cleansing velocity of 0.60 m/s to 0.90 m/s at peak flow.

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