FLOOD03064

• County: Statewide
• Basin: Statewide
• Title: Evaluating Scour at Bridges
• Date: 11/1/1990
• Prepared By: Federal Highway Administration
• Floodplain - Doc Type: Floodplain Report/Masterplan

LIST of FIGURES

Figure 2.1 Schematic Representation of Scour at a
Cylindrical . . . . . . . . . . . . . . .
Figure 2.2 Scour Depth as a Function of Time. . .
Figure 4.1 The Four Main Cases of Contraction Scour
Figure 4.2 Fall Velocity of Sand Size Particals
Figure 4.3 Abutment Shape . . . . .
Figure .4.4 Comparison of Scour Formulas . . . .
Figure 4.5 Comparison of Scour Formulas . . . .
Figure 4.6 Values o~ ys/a vs y,/a for CSU'S Equation
F~gure 4.7 Common P~er Shapes , . . , .
Figure 4.8 Pile Groups. , , . , . . . . .
Figure 4.9 Conditions upstream of bridge.
Figure 4.10 Location of piers and abutments
Figure 4.11 Plot of scour for example problem

15
19
36
44
46
50
50
51
53
53
62
62
73

LIST OF TABLES

TABLE 3.1
TABLE 4.1
TABLE 4.2
TABLE 4.3
Table 6.1

CHECKLIST OF DESIGN CONSIDERATIONS
ABUTMENT SLOPE COEFFICIENTS
CORRECTION FACTOR, K1 . , , , .
CORRECTION FACTOR, K2 . , . , .
ASSESSING THE SCOUR POTENTIAL AT BRIDGES

28
48
52
52
87

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