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Hi All, I am modelling a small catchment that is densely urbanised and contains several large industrial buildings as well as residential areas. I am using 2d_SA boundaries as my flow inputs and I am wondering what is the best way to model the buildings, as zshape blockouts or using the materials layer with very high mannings. I am wanting to see that the water flows around the buildings - especially the industrial buildings. I have also heard it mentioned that I could do cut out shapes from the 2d_SA polygons. What do you think would work the best? Thanks so much, Melodea.