The Free On-line Aquaculture Dictionary
Limiting Velocity for materials (m3/sec)
Clean water
Silt laden water
Sandy Loam non colloidal
0.5
0.8
Silt Loam non colloidal
0.6
0.9
Ordinary firm loam
1.1
Stiff clay
1.5
Fine gravel
Coarse gravel, non colloidal
0.2
1.8
Cobbles
1.7
Grassed banks
Soft rock
1.3
2.5
Hard rock
3.0
4.6
Cement/concrete
7.6