_ Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for$?

Unexpected large scale infiltration of stream water

Unexpected increase in the population

Under estimates of maximum and average flows

_ Sewer pipes are designed for maximum discharge with 25% to 33% vacan

1.	_ Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for$?
A.	Unexpected large scale infiltration of stream water
B.	Unexpected increase in the population
C.	Under estimates of maximum and average flows
D.	All of the above
Answer» E.