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


Extracted from "Sedimentation Engineering," ASCE Manuals and Reports on Engineering Practice No. 110, American Society of Civil Engineers, 2008.
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