Flood risk changes in a lowland area caused by new developments are studied and the quality of model output is assessed.
This study investigated and compared the functioning of a 2D TUFLOW hydraulic model as part of a flood risk assessment in a real world example. Nowadays the applicability of pure 2D hydraulic models improve since more high resolution elevation data is available. Therefore the performance is tested of a pure 2D hydraulic model and to study possible applications. The TUFLOW model is assessed with extensive sensitivity analyses and flood risk assessments for an area in the United Kingdom. Due to lack of data it was not possible to calibrate the roughness coefficient. The uncertainty is assessed based on the extensive sensitivity analyses. The pure 2D hydraulic model performed well in lowland areas where there was not a dominant flow direction, only little river surface and most of the flow is overland flow. Despite the lack of calibration data, the results of the flood risk assessments were reliable - representing a possible scenario - and could be used for a preliminary study.