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.
Storm drain
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A storm drain, storm sewer, highway drain, surface water drain/sewer, or stormwater drain is infrastructure designed to drain excess rain and ground water from impervious surfaces such as paved street
Combined sewer
…sewage treatment plants, so there was no perceived public health advantage in constructing a separate "surface water sewerage" (UK terminology) or "storm sewer" (US terminology) system. Moreover, before the automobile era, runoff was likely to be typically highly contaminated with animal waste. Further, until…
Storm drain grate on the Zów Łepłans in Warsaw, Poland
Storm drain with its pipe visible beneath it due to construction work
American-style curbside storm drain receiving urban runoff
Full view of a storm drain (Ontario, Canada)