Without benching, flow entering a chamber would spread, slow and drop its solids. Benching forms half-round channels continuing each pipe's line through the chamber, keeping velocity up and solids moving.
Eroded or badly formed benching turns a chamber into a debris trap — a detail CCTV and confined-space inspections routinely check.
Maintains flow and self-cleansing through access chambers.
Inside manholes and maintenance chambers on sewers and stormwater mains.
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.