So the network sensors detect flow / loss of pressure in a section of pipe.

When the team goes out to investigate, they have other sensors that use acoustics to pinpoint the leak. I personally work in software development so I don't actually deal with the leaks myself so unable to explain 100%, but from my understanding they place them at each end of a section of pipe they know there is a leak at, and then the vibrations will pin point where the leak is.

It's not even needed. I work at a water utility company and we have pressure sensors on the pipes that will alert if there is a drop. This robot stuff is just bullshit over engineering for a problem that doesn't need solving.

The real problem as stated above, is getting to and repairing those leaks.