Hi,

I am using HEC-RAS 5.0.7 to create Inundation Boundary, however, it seems HEC-RAS extends flood inundation boundaries up to Edge Lines (two sides of cross sections) and then shows the vertical elevation of floods in this area. It doesn't show extension and flooding of the neighbor areas due to higher water elevation in the boundary. Does anyone know how to deal with this challenge?

Thanks!

P.S. I used HEC-GeoRAS and got the same results.

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