Francis Sant were recently commissioned to prepare a Flood Consequence Assessment, in accordance with TAN 15, for the proposed new fire station at Trefechan, Aberystwyth. Due to its location near both the coast and to the river Rheidol, it was vital to know the flood risk for the new, highly vulnerable development. Using a 2D mathematical model, with the aid of TUFLOW, the risk to the site from both fluvial and costal source was assessed for different return periods. Mitigation measures were then identified and incorporated into the design of the proposed building.