To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

To prevent settling down of sewage both at the bottom and on the sides

1.	To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is
A.	0.50 m/sec
B.	0.60 m/sec
C.	0.70 m/sec
D.	0.75 m/sec
E.	1.0 m/sec.
Answer» E. 1.0 m/sec.