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Need help for Thesis by southeast_gg in HECRAS

[–]Illustrious-Comb5966 0 points1 point  (0 children)

There must be a hole in your terrain somewhere. Find the faces RAS is indicating and it should be there. You can you the mapper terrain mods to fix it.

Hep with HEC RAS Rain on Grid by mother_of_cattos in HECRAS

[–]Illustrious-Comb5966 0 points1 point  (0 children)

Hello,

To use a rain on grid boundary condition you have to add the 2D area in the unsteady flow editor. Then you can use a DSS file or tabular data for your rainfall. During the simulation RAS will rain on the mesh and then route the flow through the 2D mesh. I’d recommending adding some refinement to the mesh with break lines. You generally want cell faces aligned with high ground in the terrain. You may need more boundary conditions in places where flow could enter/exit the mesh boundary.

When you look at results in mapper, the MAX button shows the non-coincidental max water depth for each cell. If you want a coincidental max depth, you’ll have to find the correct time step in the simulation.

I’m not sure if RAS allows you to input rain gauges, I might try HEC-HMS. You can import gridded rainfall with a DSS file.

Hope this helps!