How does the water flow within a sewer system? More specifically (to make the game Providence-specific), how does water flow within the sewer system of Providence? Interestingly enough, entirely by gravity. A scene pops up with a short "animation" of water flowing within a sewer pipe. In this way we can give an impression of the water's movement as it surges downhill. We will present a cross-section of a street block, showing how pipes that lead from buildings are connected in a downhill slope.