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Combined sewer
A combined sewer is a sewer system that carries sanitary sewage and stormwater through the same pipes, so heavy rain can trigger combined sewer overflows of untreated sewage to rivers.
Combined sewer overflow
A combined sewer overflow (CSO) is the discharge of untreated wastewater and stormwater into rivers, lakes, or coastal waters when rainfall exceeds the capacity of a combined sewer system.
East Side Big Pipe
The East Side Big Pipe is a combined sewer overflow storage tunnel on Portland, Oregon's east riverbank, finished in 2011 as the city's largest sewer project.
Tunnel and Reservoir Plan
The Tunnel and Reservoir Plan (TARP), called the Deep Tunnel, is a Chicago system of deep tunnels and reservoirs that reduces flooding and sewer overflows.