[Chris G-M]

Hi Juan,

One way to achieve what you’re asking is to manually include the Plan filename (*.pXX) into the RAS project file (*.prj) and then manually include the new plan results in the RAS Mapper file (.rasmap) using a text editor. Close and re-open HEC-RAS and RAS Mapper and the new results should populate.

-Chris

[Chris G-M]

Orientation of your profile line relative to the direction of flow will determine if estimated discharge is negative or positive. Profile lines drawn left-to-right, looking downstream from the direction of flow will yield positive outflow estimates. Your profile line in the screenshot is drawn from right-to-left.

[Chris G-M]

Thanks for your response Cameron. I should have clarified before but my inline structure is actually a SA/2D Area Connector. I enabled the computation level output flag but nothing was written to the *.hyd file since there are only storage-areas and 2D flow areas present in the model (my assumption). If the computation level output file should also be able to handle SA/2D Area Connector results, please let me know.

[Chris G-M]

Hi Lonnie,

You’re correct. If there are not many cells of interest then using RAS Mapper to plot individual depths-over-time would be sufficient. However, until HEC-RAS incorporates ‘max flood depth’ as an option for Arrival Time result maps, accessing cell depth info for many cells (e.g., entire 2D mesh) is straight forward using the HDF5 output.

For example, a rough max flood depth arrival time map could be produced via:
1) Export HDF5 cell depth results to Excel (or another program if output is too large)
2) Determine time to peak flood depth for each Cell ID
3) Join/associate the cell peak flood depth times to a shapefile of the mesh (GIS)

If someone has an easier or more RAS Mapper central approach, I’d be interested to hear your process.

Thanks,
Chris

[Chris G-M]

Hi Karina,

To access the HDF results I used HDFview software and then extracted individual peak flood depth arrival times using MATLAB. I ended up not creating a map of cell-by-cell peak flood depth arrival time. For my case it was sufficient to pick individual locations of interest, look up cell depth time-series from the HDF5 output, and then plot cell depth hydrographs to detemine peak flood arrival time.

Hope that helps,
-Chris

[Chris G-M]

Thanks for the response Cameron. Pulling depth-over-time from the HDF file has worked for now. Hopefully there will be a result map option for ‘Peak Flood Depth’ arrival time in a future RAS release.

[Chris G-M]

Is your ‘around a million’ cell limit based on experience or a known programming limitation? Triangulating a mesh with ~2.2 million cells is feasible in the geometry editor but a memory exception is thrown during the ‘Compute 2D Flow Areas Hydraulic Tables’ command. Definitely not a hardware limitation (128GB DDR4 RAM) but I’m curious if this limitation will persist or if others have found a work-around for larger models. Any hints or clarification would be appreciated.

Best regards,
Chris

[Chris G-M]

Resolved: No limitations regarding FLT surface file size is covered in the User’s Manual. After trimming the surface file and exporting as a sub-2GB FLT file (i.e., 1.6 GB), RAS Mapper was able to import and perform the “Floodplain Mapping” function. Unofficially, it seems RAS Mapper from HEC-RAS 4.1.0 has a 2 GB filesize limit for FLT terrain surfaces.

Cheers,
Chris

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