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(Wastewater) Collection System Questions with Correct Answers 2026

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(Wastewater) Collection System Questions with Correct Answers 2026

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(Wastewater) Collection System Questions
with Correct Answers 2026
Name the four types of lines in a community wastewater system. - CORRECT ANSWER --
Lateral lines

- Sub-main "branches"

- Main Line

- Trunk



Minimum velocity of wastewater in collection system? - CORRECT ANSWER -2ft per second



Maximum velocity? - CORRECT ANSWER -10ft per second



Where should manholes be installed? - CORRECT ANSWER -- End of each line

- Changes in grade, size, or alignment



Wastewater lines need to be how far from lateral water lines? - CORRECT ANSWER -10 feet



Wastewater lines need to be how far from proposed petroleum storage tanks or water well
s? - CORRECT ANSWER -50 feet



Water that flows into a wastewater collection system. - CORRECT ANSWER -Inflow



Ground water that has entered a wastewater collection system through defective pipes, pip
e joints, connections or manhole walls. - CORRECT ANSWER -Infiltration



Wastewater that is similarly leaking out of a collection system and into the environment. -
CORRECT ANSWER -Exfiltration

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