Calculation of abutment scour using the Froehlich (1989) design formula, Bavya Vuppalapati, San Diego State University

       online_scour_froehlich1989: Calculation of abutment scour using the Froehlich 1989 equation

Formula:

Fr = v /(gy_a)^1/2
(y_s / y_a) = 2.27 K₁ K₂ (L^' / y_a)^0.43 Fr ^0.61 + 1

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

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

INPUT DATA:      [Description]     [Sample Input]

Select units:

Flow depth y₁ :

Flow velocity v₁ :

Length of flow obstructed by the embankment L^' :

Angle of embankment with the flow θ (degrees):

Select abutment shape:

OUTPUT:
System of units: SI units (metric)

Abutment shape: Vertical wall

♦ Scour depth y_s :

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or recalculate

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