![]() The local hydraulics would be best modeled in a 2D model. The problem with excessive skews is that you have one side of the flood plain outside the contraction reach while the other side is already going through the bridge. I have used it for up to 40 degrees on narrow flood plains with flows under 10,000 cfs. The skew function in HEC-RAS reduces the horizontal distance by the cosine of the skew angle.
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