Scour Design Parameters: ABUTMENT_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 | notes |
|---|---|---|---|---|---|
| ABUTMENT_SCOUR | K_theta_downstream | Skew angle theta < 90 deg (abutment angled downstream) | Abutment skew factor K_theta for downstream-pointing skew | (theta/90)^0.13 | theta < 90 deg reduces scour relative to perpendicular abutment |
| ABUTMENT_SCOUR | K_theta_upstream | Skew angle theta > 90 deg (abutment angled upstream) | Abutment skew factor K_theta for upstream-pointing skew | (theta/90)^0.61 | theta > 90 deg increases scour significantly; avoid upstream-skewed abutments |
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