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Scour Design Parameters: PIER SCOUR
K3 small dunes to K4 formula
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) |
|---|---|---|---|---|---|
| PIER SCOUR | K3 small dunes | Small dunes (dune height 2-10 ft) | Bed condition correction factor K3 | 1.1 | 1.1 |
| PIER SCOUR | K4 formula | D50>=0.007 ft and D95>=0.066 ft; VR=V1/Vc50; min K4=0.4 | Armoring/sediment gradation correction K4 | 0.4*(VR)^0.15 | — |
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