I found this while working a couple of weekends ago.
As some of you may be aware, the Sewage Works at Motney Hill serves pretty much all of the built up Medway Area. Attached are a map and index of how your sewage gets to the Works at Motney Hill.
Some of these pumping stations are huge, others are very small. The New Brook Pumping Station in Chatham for example is massive while the one on Dock Road, near the Shell Garage is tiny.