In a sanitary sewer, infiltration refers to the entry of:
Correct answer: C. Groundwater through cracks and defective joints
- A. Domestic sewage from household plumbing fixtures
- B. Stormwater through roof gutters and street inlets
- C. Groundwater through cracks and defective joints
- D. Industrial wastewater discharged through approved connections
Explanation
Infiltration is groundwater entering a sewer through cracks, joints or other defects below the groundwater level. Stormwater entering through direct connections or openings is generally called inflow.
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Environmental engineering examines water supply, water quality, treatment processes, wastewater collection and treatment, solid waste management, air pollution and public health protection. It covers sedimentation, coagulation, filtration, disinfection, biological treatment and disposal methods, while distinguishing drinking-water treatment from sewage treatment and BOD from COD.
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