online_scour_jainandfisher:  Calculation of local scour using Jain and Fisher's equation   

F = v /(gy)1/2

Vc = Ku y1/6D501/3

Fc = Vc /(gy)1/2

For clear-water scour (F - Fc ≤ 0.2):

ys = 1.84 a Fc0.25 (y /a)0.3

For live-bed scour (F - Fc > 0.2):

ys = 2 a (F - Fc)0.25 (y /a)0.5

[ SI Units (metric):  ys, y, a, in m, and D50 in mm; Ku = 6.19 ]
[ U.S. Customary Units:  ys, y, a, in ft, and D50 in mm; Ku = 11.17 ]
[ F = Froude number; g = gravitational acceleration ]

Reference

INPUT DATA:      [Description]     [Sample Input]

Select:      

Flow depth y :      

 

Flow velocity v :      

 

Pier width a :      

 

Median diameter of the bed material D50 :      

 

OUTPUT:

SI units (metric)
Clear-water scour
Fc:  

♦  Scour depth ys :     

Press button to
or recalculate

  Your request was processed at  09:40:49 pm on January 18th, 2026   [ 260118  21:40:49 ].

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