During the inspection of a recently installed building sewer, a plumber observes that the pipe has settled in one section, creating a belly that restricts flow. What is the most appropriate action to rectify this situation?

Question: During the inspection of a recently installed building sewer, a plumber observes that the pipe has settled in one section, creating a belly that restricts flow. What is the most appropriate action to rectify this situation?

Answer options:

• Flush the system repeatedly with high-pressure water to clear the obstruction.
• Insert a camera to assess the extent of the belly and schedule regular maintenance. ✅ Excavate the affected section, re-establish the correct bed, and re-lay the pipe to the proper grade.
• Install a cleanout upstream of the belly to allow for easier access and future clean-outs.

Correct answer: Excavate the affected section, re-establish the correct bed, and re-lay the pipe to the proper grade.

Explanation: A belly in a building sewer creates a low spot where solids and debris can accumulate, leading to chronic blockages. The only permanent solution is to excavate the section, properly prepare the trench bed, and re-install the pipe to the correct, consistent grade. Flushing or camera assessment are temporary measures or diagnostic steps, not permanent repairs for a pipe with incorrect grade.