(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
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
