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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

3. Plug (sanitation) - Wikipedia

   en.wikipedia.org/wiki/Plug_(sanitation)

   2. Inlet from basin overflow 3. Sealing rim 4. Screw for height adjustment 5. Ball joint 6. Actuator arm 7. Joint 8. Control arm . Some modern plugholes dispense with the need for a separate plug, having instead a built-in 'pop-up plug' operated by a handle on the sink, that can move up or down to open or close the plughole.

4. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.

5. Sanitary sewer overflow - Wikipedia

   en.wikipedia.org/wiki/Sanitary_sewer_overflow

   A manhole cover unable to contain a sanitary sewer overflow. Sanitary sewer overflow (SSO) is a condition in which untreated sewage is discharged from a sanitary sewer into the environment prior to reaching sewage treatment facilities. When caused by rainfall it is also known as wet weather overflow.

6. Pool suction-drain injury - Wikipedia

   en.wikipedia.org/wiki/Pool_suction-drain_injury

   In 1982, the Consumer Product Safety Commission reported that five children were disemboweled by drains in wading pools and urged pools to install covers on drains. [2] [3] A standard 8 inches (20 cm) main drain can develop up to 350 pounds (160 kg) of force, which could hold a person underwater in tight grip until the suction is released.

7. Combined sewer - Wikipedia

   en.wikipedia.org/wiki/Combined_sewer

   Combined sewer outflow into the Anacostia River in Washington, D.C. Ratcliff Beach CSO discharges into the River Thames in London [7]. These relief structures, called "storm-water regulators" (in American English - or "combined sewer overflows" in British English) are constructed in combined sewer systems to divert flows in excess of the peak design flow of the sewage treatment plant. [6]