(Wastewater) Collection System Questions with Correct Answers

(Wastewater) Collection System Questions j j j


with Correct Answers 2025/2026
j j j j
Name j the j four j types j of j lines j in ja j community j wastewater j system. j-
j CORRECT j ANSWER j -- jLateral j lines

- Sub-main j "branches"

- Main j Line

- Trunk



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




Maximum j velocity? j- j CORRECT j ANSWER j -10ft j per j second




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

- Changes j in j grade, j size, j or j alignment




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




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




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




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




Wastewater j that j is j similarly j leaking j out j of ja j collection j system j and j into

, j the j environment. j - jCORRECT j ANSWER j -Exfiltration