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Thank you for responding to the post. I am aware of these functions within HEC-RAS. Applying the skew angle within the program produces an overly conservative estimate for pier width due to HEC-RAS assuming the piers to be continuous (i.e. a solid wall equal to the length of the bridge width)...

Existing condition: There are two existing parallel bridge structures with the south bridge carrying eastbound traffic and the north bridge carry westbound traffic. The channel bends just upstream of the existing bridge opening and flows through the crossing with the existing piers for both...