Wonky Edge Lines

[Jeremy Kobor]

I have a 1D model with 200 reaches and 10000 cross-sections. When I generate edge lines, about 20 of generate erroneously with lines criss-crossing the watershed. I have checked to make sure my cross-sections and stream segments are in the correct direction and that reaches are named properly. I have tried to edit these edge lines in RAS-Mapper, but when saving the geometry edits the program crashes. Please let me know if you have any thoughts on why this might be happening and what a potential solution may be. I was hoping to attach photos, but this box does not seem to allow pasting of images.

[Chris Goodell]

The program crashing is a bug. You might try a different version of RAS, and/or check the release notes/known bugs documents on the HEC website to see if HEC is aware of this. As for the cross-crossing, you already took care of the two most likely culprits (cross sections must be drawn left to right, looking downstream and the stream lines must be drawn from upstream to downstream). I’m not sure if this would cause edgeline issues, but I have noticed poor and/or inconsistent bank stations can cause some weirdness in the interpolated surface, so you might look into that as well. Good luck!

[Luis Partida]

Hi Jeremy, when a model is that large, there are bound to be human error. In my experience, the criss-crossing edge lines are due to random cross sections being drawn in the wrong direction in between cross sections drawn the correct way. This causes left bank and right banks to be in the wrong location hence why the lines cross. Hope this helps

[Jeremy Kobor]

Thanks for the responses. I think the solution was to delete the hdf files and add the corrected edge lines (edited in ArcGIS) before saving edits for the first time/the hdf file was created. I haven’t had any issues since, but I also haven’t tried to edit the edge lines since.

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