Typhoid bacteria diagram, 1905
Volume of Sludge from 1,000,000 Gallons of Sewage
Diagram Showing Decreased Amount of Dissolved Oxygen in Delaware River, 1913
Pipes, distribution mains, transmission mains, filtration plants, pumping stations, and all other appurtenances, either above or underground, that relate to providing drinking water to homes and businesses. In tandem with sewer systems, properly-designed water supply systems are what make densely-populated urban areas possible.