Backfall usually appears when ground settles under a poorly compacted trench, when tree roots lift a pipe, or when the original installation was simply laid flat. Water and solids sit in the affected section, forming a permanent pond inside the pipe.
On camera, backfall shows up as standing water with the camera lens dipping underwater. Persistent gurgling, slow drainage and repeat blockages at the same spot are classic symptoms.
A defect term — describes lost gradient rather than a designed feature.
Anywhere along a drain, most often under driveways, filled ground or large trees.
A CCTV drain inspection is the standard way to confirm whether this is what's happening in your pipes: the camera shows the condition on screen, a locator pinpoints the exact position and depth, and you get a recorded report before any repair decisions are made.
A CCTV drain inspection shows exactly what's happening inside your pipes — no guesswork.