much greater than 1

slightly less than 1

equal to 1

slightly greater than 1

less than 1.0 m/sec

1.0 m/sec to 1.2 m/sec

1.5 m/sec to 2.0 m/sec

3.0 m/sec to 3.5 m/sec

given in the direction of natural slope of ground

given in the direction opposite to natural slope of ground

zero

steeper than 1 in 20

equal to dry weather flow (DWF)

2xDWF

3 x DWF

6xDWF

equal to rainfall

rainfall + DWF

rainfall + 2 DWF

rainfall + 6 DWF