Different wing wall angles in HEC-RAS

[flem1014]

I am doing a floodplain study in which I have a proposed arch culvert with two different wing wall angles (45-degrees and 90-degrees...to direction of channel flow). FWHA Chart and Scale Number options provided in the program only allow for a 0-degree, 45-degree and 90-degree wing wall angle for both wing walls on a ConSpan structure. Any thoughts on how to model this entrance and/or provide justification to the review agency?

Thanks in advance.

 

[gbam]

I would pick the most conservative (higher Ke).