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Changing Manning's roughness by a percentage for an area of interest

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Hi there,

I'm looking to do a sensitivity analysis for the Manning's roughness for a particular area in a basin.

I see that we can use Read Materials File == My_Materials.tmf | 1.1 command to define the % change, but that would make a global change. Is there a quick way of changing the material roughness for a given region defined by a shapefile? I just want to avoid creating multiple 2d_mat shapefiles.




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