Self-cleansing velocity in a sanitary sewer pipe is maintained to prevent:
AProduction of toxic gases
BDeposition and settling of suspended solid matter
CBackflow into domestic connections
DExcessive scouring of pipe invert
Explanation
Self-cleansing velocity (typically 0.6 to 0.9 m/s) is the minimum flow velocity maintained in sanitary sewers to ensure suspended organic and inorganic solids remain in suspension and do not deposit or clog pipes.
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