Critical & Boundary Shear Stress Override Option

Program can calculate the critical shear stress based on median particle size of the bed material and also can calculate the boundary shear stress at the stream bed based on the flow depth and flow velocity.

Critical shear stress (psf)

tc = 4D50
Boundary shear stress (psf)

t1 = g y1S
Where:
g  is the water unit weight
y1 is the average flow depth or hydraulic depth
S is the energy slope of the flow.

User can override the above calculated value by choosing this option