Assistance Requested: GMS/MODFLOW GHB Errors and Head Display

[nasrin badrzadeh]

  Dear Colleagues,

I hope you’re all doing well. I’m encountering two stubborn issues in my Great Miami watershed model that I’d like to share with the group and get your thoughts on. First, even after raising my General-Head Package elevations, the Model Checker still flags numerous cells where the boundary head is below the cell bottom elevation. Second, although the .hds file is generated without error, I can’t seem to load or visualize the simulated head results in the 2D Map view.

Has anyone faced similar challenges? I’d be grateful for any suggestions on ensuring GHB elevations sit correctly above the cell bottoms or on the proper steps to load and display the head output. I’m happy to circulate screenshots or the export files, or to hop on a brief call if that would help clarify the problem.

Thank you in advance for your time and expertise.

    

[Philip Margarit]

So, GMS sometimes does this where if you have a lot of GHB cells that have head below cell bottom, it won’t show everything in the model checker but it will all be in your out file. The quickest solution here would be to export your model grid as a shapefile and your GHB package dialog from GMS as a text file and merge them in ArcGIS based on cell ID. Then you can either programmatically check which GHB cells have heads below cell bottom or do it directly in ArcGIS by adding a field and in your shapefile and subtracting head from cell bottom. In those scenarios, I typically set it to cell bottom + .1 meters to still simulate water going out of my model at those cells without getting an error. That is probably the fastest way to deal with this issue in GMS

Philip Margarit

Water Resources Science PhD Candidate

College of Food, Agriculture, and Natural Resources Science 

University of Minnesota, Twin Cities

651-262-3561

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This group was created in 2004 by Mr. C. P. Kumar, Former Scientist 'G', National Institute of Hydrology, Roorkee. Please visit his webpage at https://www.angelfire.com/nh/cpkumar/
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