equal to dry weather flow (DWF)
2xDWF
3 x DWF
6xDWF
equal to rainfall
rainfall + DWF
rainfall + 2 DWF
rainfall + 6 DWF
15 cm and 100 cm
15 cm and 300 cm
30 cm and 450 cm
60 cm and 300cm
less strength
difficulty in construction
difficulty in transportation due to heavy weight
less life
rectangular section
circular section
standard form of egg shaped sewer
modified egg shaped section