combined sewers

combined sewers

[kəm′bīnd ′sü·ərz]
(civil engineering)
A drainage system that receives both surface runoff and sewage.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"The large, combined sewers tended to be close to downtown and under well-developed and well-traveled roads," Hanas said.
Located near Crompton Park, the Quinsigamond Avenue Combined Sewer Overflow Treatment Facility functions as a sewer pumping station during dry periods or small rain storms, when only sewage or sewage mixed with moderate amounts of runoff is flowing through the combined sewers.
Project components include including treatment plants, wastewater collection system, and pump stations, construction of a new sanitary sewer system, coastal interceptor sewers, combined sewers, wastewater collection and pipelines, and two secondary treatment plants.
The wastewater treatment industry argues that bypassing biological treatment for a portion of the water is a significant improvement over releasing completely untreated wastewater, which is what happens when combined sewers overflow.
Combined sewers in Atlanta and elsewhere as well as surface runoff and treated wastewater are discharged into the Chattahoochee River all along its length.
According to a consent decree filed in September in federal court, the city is required to develop and implement a comprehensive plan to reduce, and where feasible, eliminate overflows into the Ohio River from its combined sewers by calendar year 2020 or 2025, depending on Jeffersonville's financial health; implement a plan with specific actions to improve the capacity, management, operation, and maintenance of its sanitary sewer system to eliminate overflows of untreated sewage; and eliminate all discharge points within its sanitary sewer system.
In some locations, such as Cumberland and Washington, DC, the mud and sludge drains into combined sewers (that hold both rainwater and raw sewage) and, if it rains (in some areas more than 1/10 of 1 inches), overwhelms the combined sewers and flows directly into the Potomac River and its tributaries without first being treated.
A major source of this is the trash and debris discharged from combined sewers and storm sewers during rain events.

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