Scour Design Parameters: CONTRACTION_CLEAR_WATER
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 |
|---|---|---|---|---|---|---|
| CONTRACTION_CLEAR_WATER | Dm_multiplier | Dm = 1.25 * D50 (in feet) | Effective diameter multiplier for clear-water contraction scour | 1.25 | 1.25 | Clear-water scour occurs when V < Vc (critical velocity); Ku=11.17 SI or Ku=11.17 US |
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