Scour Design Parameters: PIER_SCOUR
HEC-18/HEC-20 scour estimation parameters for bridge hydraulics — pier scour CSU equation K1-K4 correction factors, Laursen contraction scour exponents, and Froehlich abutment scour shape/skew factors
| scour type | factor name | condition | factor description | factor value | factor value numeric (dimensionless) | notes |
|---|---|---|---|---|---|---|
| PIER_SCOUR | K1_circular_cylinder | Circular cylinder | Pier nose shape correction factor K1 | 1.0 | 1 | Group of cylinders also uses K1=1.0 |
| PIER_SCOUR | K1_group_cylinders | Group of cylinders | Pier nose shape correction factor K1 | 1.0 | 1 | Use K1=1.0 for pile group |
| PIER_SCOUR | K1_round_nose | Round nose pier | Pier nose shape correction factor K1 | 1.0 | 1 | Round nose and circular cylinder share K1=1.0 |
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