Sewers are sized for wastewater, not rainfall. Every cracked pipe, leaky joint and illegal downpipe connection lets rain into the sewer; in big storms the combined flow surcharges the network and engineered relief points (and unlucky private gullies) overflow.
Reducing inflow and infiltration — fixing private drain defects included — is how the problem shrinks over time.
Names the rain-driven overflow failure mode of sewer networks.
Network relief structures, manholes and low private gullies during major rain.
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.