As per Central Public Health and Environmental Engineering Organization (CPHEEO), the minimum velocity at ultimate peak flow and maximum velocity of flow to be adopted in the design of gravity sewers shall be respectively :
1
0.4 m/s and 2.0 m/s
2
0.6 m/s and 3.5 m/s
3
0.8 m/s and 3 m/s
4
0.45 m/s and 1.5 m/s
5
1.6 m/s and 6 m/s