Spatial boundary of result map in RAS Mapper?

[JongChun]

　Hello, all. I have a simple question.

　I’ve built a 1D HEC-RAS file, simulated and visualized it on RAS mapper as below figure.

　And then I make depth of water in result map (Because, I want to see the flood plain of my river). But, the end part of depth (flood plain) is stopped at the end of XS line. What I expect is flood plain propagates until it meets more higher elevation in DEM (terrain).

　Is there any ideas to solve this problem?

　Cheers,

[Lonnie A]

You need to extend the cross-sections out past the floodplain extents.

[JongChun]

Thank you for your helpful comment.

But the problem is my target reaches are more than 2 hundreds. Moreover, I have no information about past flood plain extends. So, I maybe extend XS enoughly as much as possible.

In this situdation, is there any way to extend cross-section easilly instead of manually stretching them?

[JongChun]

And one more thing. I stretch several cross-sections manuallly as more than twice. Result appears in View/Edit gemetry window well as below:

But, when I re-generate them on ras mapper, XS line becomes more shorter not longer. Why this result is happend?

Cheers,

[Lonnie A]

You can’t just drag the ends of the cross-section, you need to resample them from the terrain file. It also looks like the xs aren’t geospatial but are just perpendicular to the channel centerline?
You sometimes have to close and reopen RAS to get the graphics to update.

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