Has anyone had any experience with modeling a structure on the order of a triple 7' x 7' box culvert in HEC-RAS? I seem to have run across an issue with the program when trying to model a proposed 2,400'+ long version of the aforementioned structure for a project. We were tasked with needing to show the backwater effects for blocking one of the three, as crazy as that seems, and HEC-RAS was giving very unstable results, including a lower WSEL for the 100-yr than the 25-yr. It was defaulting to the Critical WSEL since it wasn't able to calculate a WSEL for the given circumstances; however, some troubleshooting revealed that upon shortening the culvert to approximately 1500' it gave reasonably accurate results. Anyone ever seen this issue previously?
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