open TELEMAC-MASCARET The mathematically superior suite of solvers

Thanks for your replies.
I created the mesh from File/ Triangulation by using the DEM and closed line for the boundaries. I created two T3s files (one for the topography and the second for the roughness). Then, I created a selfain object and tried to add the two T3s files to it by 1- Adding it as a variable, 2- drag and drop the T3s file under the Selfain file. both methods are taking a too long time (more than 3 hrs until now) and I think it will crash.

Thus, I would like to ask if there is another method to add the data to the Selfain object ?

Looking forward to hearing from you.

Best regards.
Omar