Which term describes isolating a segment of the sewer system to observe flow during testing?

Which term describes isolating a segment of the sewer system to observe flow during testing?

• A. Television Inspection
• B. Dye testing
• C. Lamping
• D. Flow isolation

Answer: (D)

Isolating a section of the sewer to observe how it handles flow during testing is flow isolation. This approach confines a specific length of pipe by closing upstream and downstream valves or placing plugs, so only that segment is tested. With the segment sealed, you can directly monitor flow, measure hydraulic performance, and detect issues like leaks or infiltration without interference from adjacent sections. The other terms refer to different evaluation methods: television inspection uses a camera to visually inspect the pipe interior; dye testing introduces dye to trace flow paths and identify cross-connections; lamping involves using a light to observe flow or conditions inside the pipe, not to isolate for a controlled flow test.