If you are wondering what this photo is about, its been taken from the inside of a 100mm sewer pipe with a CCTV camera.
What it shows is the pipe is almost completely blocked with roots that have penetrated the pipe joints.
If you think all these roots are quite thin then have a look at this Root that has been cut out of a sewer, compared with a 50c coin.
Just remember these photos before you plant a big tree in that Easement in your property.
Most water authorities produce guides of suitable things to plant near sewers and drains, Here is a link to Melbourne Water’s Guide
For similar posts see Gardening