Sample type

WDPT (sec)

Radius (cm)

ODPT (sec)

Radius (cm)

WDPT/ODPT

Sludge

114.77 ± 16.76

0.44 ± 0.09

5.05 ± 1.26

1.25 ± 0.14

22.73

Sand

0.86 ± 0.22

1.167 ± 0.164

10.11 ± 2.02

1.07 ± 0.14

0.08