Realising the benefits of integrated urban drainage models

Abstract

Managing urban flood risk can be complicated owing to drainage system interaction, and modelling these interactions has until recently been confined to relatively small areas. The interactions between the above- and below-ground systems can be crucial when predicting where flooding occurs. Recent advances in computational power and software has enabled, for the first time, detailed modelling of below- and above-ground drainage systems, across city-wide applications. A case study of integrated modelling across Glasgow is presented. A hierarchical approach to modelling flood risk is taken, initially using a coarse topographical model linking with available sewer and watercourse models. Hot spot areas are identified using a consequence assessment to identify communities to consider in more detail. Five communities are selected for more detailed analysis, where a more detailed integrated model is used to assess flood risk and annual average damages. A hierarchical solution development approach is applied to test solutions in stages. Using flood risk and assessing damages enables a benefit assessment of potential solutions across a wider area for a range of events. The work demonstrates that techniques, ideas and innovative solutions are now able to be drawn together in a truly integrated approach to managing flood risk.