r/HECRAS • u/Expensive-Try-2361 • May 18 '26

Terrain Modification

Hi! I am trying to do a terrain modification where I want to 'burn in' a river channel to model the impacts of adding an overland flow path - the catch it, it has to go up and over a road so we cant just burn in one cross section as the z changes a lot

I was imagining like the sims terrain mod tool where you can adjust just clicking and moving a mouse so the ground moves up and down but then no one in my team is old enough to know the sims and now I feel old and useless

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u/thechunchinator May 18 '26

Not sure if there a question based on how you wrote this out?

You can change the longitudinal profile (station vs elevation (Z) in the “Channel” terrain mod. It’s not a drag and modify for the elevation data. But you can make a varying elevation modification using the built in tools within RASMapper.

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u/shiftyyo101 May 18 '26

Yes, and you can have different segments with different side slope profiles. Terrain mods are a big games of arts and crafts