Roots enter collection systems through which of the following paths?

Roots enter collection systems through which of the following paths?

• A. air gaps
• B. inflatable dams
• C. pipe cracks
• D. manhole covers

Answer: (C)

Tree and shrub roots are drawn to the moisture inside sewer pipes, so any small openings in the pipe, like cracks or loose joints, become entry points for them to grow into the system. Once inside, they can expand and form blockages, reducing flow and causing backups. The other options aren’t pathways for root intrusion: air gaps are part of backflow prevention, inflatable dams are temporary flow-control devices, and while roots can reach near manholes, the typical entry route is through cracks and joints in the pipes themselves.

Tree and shrub roots are drawn to the moisture inside sewer pipes, so any small openings in the pipe, like cracks or loose joints, become entry points for them to grow into the system. Once inside, they can expand and form blockages, reducing flow and causing backups. The other options aren’t pathways for root intrusion: air gaps are part of backflow prevention, inflatable dams are temporary flow-control devices, and while roots can reach near manholes, the typical entry route is through cracks and joints in the pipes themselves.