20221160 Ver 1_permissble velocity_20221026

Boundary
Category
Bank Material Type
Permissible
Shear Stress
(lb/sq ft)
Permissible
Velocity
(It/sec)
Citation(s)
z
( )
Soils
Fine colloidal sand
0.02 - 0.03
A
Sandy loam (noncolloidal)
0.03 - 0.04
1.75
A
Alluvial silt (noncolloidal)
0.045 - 0.05
2
A
Silty loam (noncolloidal)
0.045 - 0.05
1.75 — 2.2
A
Firm loam
0.075
A
Fine gravels
0.075
2.5
A
Stiff clay
0.26
3 — 4.5
A, F
Alluvial silt (colloidal)
0.26
3.75
A
Graded loam to cobbles
0.38
3.75
A
Graded silts to cobbles
0.43
4
A
Shales and hardpan
0.67
6
A