Sanitary sewer
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A sanitary sewer is an underground pipe or tunnel system for transporting sewage from houses and commercial buildings to a sewage treatment plant or disposal.
Sanitary sewer installation with PVC pipe. Sanitary sewers are sized to carry the amount of sewage generated by the collection area. These sewers are much smaller than combined sewers, which are designed to also carry surface runoff.
Manhole access to sewer
Schematic of a conventional sanitary sewer to convey blackwater and greywater from households to a centralized sewage treatment facility.
A manhole cover for a sanitary sewer access point.
Combined sewer
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A combined sewer is a type of gravity sewer with a system of pipes, tunnels, pump stations etc. to transport sewage and urban runoff together to a sewage treatment plant or disposal site. This means t
Interior of a combined sewer in Brighton, England.
Combined sewer outflow into the Anacostia River in Washington, D.C.
A medieval waste pipe in Stockholm Old Town formerly deposited sewage on the street to be flushed away by rain.
Sewage canal of a medieval house as depicted in 1447 St. Barbara Altarpiece in the National Museum in Warsaw.