A plumber is called to a new construction site where the buried stormwater main has been damaged by heavy equipment, resulting in a large crack and a section of pipe displaced. The pipe is a 375 mm PVC storm sewer at a depth of 2.5 metres. What is the most effective and durable repair method for this situation?

Question: A plumber is called to a new construction site where the buried stormwater main has been damaged by heavy equipment, resulting in a large crack and a section of pipe displaced. The pipe is a 375 mm PVC storm sewer at a depth of 2.5 metres. What is the most effective and durable repair method for this situation?

Answer options:

• Apply a strong adhesive patch directly over the cracked area and backfill.
• Wrap the damaged section with heavy-duty construction tape and ensure proper compaction during backfilling. ✅ Cut out the damaged section of pipe and install a new section using appropriate couplings (e.g., shielded couplings) as per manufacturer specifications.
• Fill the damaged section with concrete to seal the crack and provide structural support.

Correct answer: Cut out the damaged section of pipe and install a new section using appropriate couplings (e.g., shielded couplings) as per manufacturer specifications.

Explanation: For a significant crack and displacement in a buried storm sewer, simply patching, taping, or filling with concrete are inadequate and temporary repairs that are likely to fail. The most effective and durable method is to cut out the damaged section and replace it with a new piece of pipe, joined securely with appropriate, sealed couplings to maintain the pipe's integrity and prevent infiltration or exfiltration. This ensures the long-term functionality of the storm sewer.