Every CCTV inspection logs defects by chainage: "root mass at 14.2 m" means 14.2 metres of pipe from the access point. Combined with a sonde trace, chainage converts footage into a dig location.
Reading a drain report is mostly reading chainages — they turn a video into a map of the pipe's condition.
Provides the along-pipe coordinate system for locating defects.
In every CCTV inspection report and drainage survey.
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.