online_scour_froehlich1988:  Calculation of pier scour using the Froehlich (1988) formula   


Fr1 = v1 / (g y1)1/2

ys = 0.32 b φ Fr10.2 (be / b)0.62 (y1 / b)0.46 (b / D50)0.08 + b

[ SI units (metric):  ys, y1, and b in m; v1 in m/s; D50 in mm ]
[ U.S. Customary units:  ys, y1, and b in ft; v1 in ft/s; D50 in mm ]
[ Fr = Froude number; g = gravitational acceleration ]


INPUT DATA:      [Description]     [Sample Input]


Flow depth y1 :      


Flow velocity v1 :      


Pier width b :      


Angle of attack θ of the flow (degrees):      


Median diameter of bed material D50 :      


Pier nose shape:      


System of units:  SI units (metric)

Pier nose shape:  Square nose

  Scour depth ys :     

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