Southeast Sewage Treatment Works diagram, 1955
Outside Sprinkling Filters, Spring Garden Sewage Experiment Station, 1911
State Road triple pipeline construction, 1904
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.