online_scour_froehlich1989:  Calculation of abutment scour using Froehlich (1989) equation   



Fr = v /(gya)1/2

(ys / ya) = 2.27 K1 K2 (L' / ya)0.43 Fr 0.61 + 1


[ SI Units (metric):  ys, ya and L' in m ]
[ U.S. Customary Units:  ys, ya and L' in ft ]
[ Fr = Froude number; g = gravitational acceleration ]


Extracted from "Evaluating Scour at Bridges," FHWA Hydraulic Engineering Circular No. 18, Fifth Edition, 2012.
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