online_scour_froehlich1989:  Calculation of abutment scour using the Froehlich 1989 equation   


Formula:

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 ]


Reference:

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



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