Representing buildings and urban features in hydrodynamic flood models

Abstract Flood risk in cities and built‐up areas is a major threat which likely to grow due increased urbanisation climate change. It priority for urban planning, civil defence insurance accurately represent buildings features hydrodynamic models assess flood people, properties, assets infrastructure an uncertain future. The correct representation of currently blocked by the lack detailed accurate techniques has become improvement modelling now that better data computational resources are available. This study reviewed available approaches implemented widely used ‘ stubby building ’ approximation as well more realistic innovative hole approach using model CityCAT. city centre Newcastle upon Tyne, UK, was case study, allowing independent validation methods direct, systematic comparison performance. Shortcomings approximate method described, guidance given on limits its reliable application scope improvement.