Thanks Scott!
That makes sense, I have added land use layers for the roughness. My only other concern with the “rougher” terrain is an increased surface area that the model would apply the manning’s values to. Is the extra area of all of the sides of the little pyramids a problem? Or is the increase so small that I’m over analyzing it?
The channel bottom was dry at the time of the flight, it is generally flat and sandy bottomed.
I agree with your point on the inundated areas, after running both terrains in the same model the flat banks fill with water more quickly than the “rougher” looking terrain.
I am planning on using a full 2D model only for the main channel and floodplain.