The Free On-line Aquaculture Dictionary

Scouring Velocity

Material

Velocity m/sec

Soft earth, river mud, silt

0.08

Clay

0.15

Sand - Fine

0.21

Sand - Coarse

0.24

Fine gravel

0.30

Pebbles (25mm diameter)

0.60

Stones (75mm diameter)

1.50

Boulders (300-450mm diameter)

3.00