The TUFLOW Bed Shear Equations are given as:
Metric Units:
where:
= Density
= Gravity
= Velocity
= Manning's n
= Depth
Units are in N/m^{2}
In US Customary Units, the total bed shear stress is given as:
Where:
= Specific weight of water
R = Hydraulic Radius
S = Energy Slope
Manning's Energy Grade Line Slope in English Units is given as:
Where:
= Specific weight of water
R = Hydraulic Radius
S = Energy Slope
CME =1.486 in English units and 1.0 in SI units
Where:
= Density
= Gravity
In channels where the width is 10 times greater than Depth (R), then (R) is taken is Depth ().
With substitution, we get:
With cancellation and roundup, we get:
Units are in lb/ft^{2}
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