I am just started looking into this.
I will need to model urban scenarios where I will need to model buildings.
Can you model buildings as obstruction, to measure impact of flood, pre and post with a new building ?
Are you talking about 1D or 2D modeling? 1D modeling has the blocked obstruction option. For 2D modeling you would either need to account for the building using a high roughness value or adjust the terrain to account for the building.