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

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 ]

Reference

INPUT DATA:      [Description]     [Sample Input]

Select:      

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:      

OUTPUT:

System of units:  SI units (metric)

Pier nose shape:  Square nose

♦  Scour depth ys :     

Press button to
or recalculate

  Your request was processed at  09:55:51 pm on July 6th, 2025   [ 250706  21:55:51 ].

Thank you for running   online_scour_froehlich(1988)   Please call again.   [171023]

Documents in Portable Document Format (PDF) require Adobe Acrobat Reader 5.0 or higher to view; download Adobe Acrobat Reader.