Author(s): D. Bertram; M. Roberts; H. Haynes
Linked Author(s): Douglas Bertram
Keywords: No Keywords
Abstract: Data and models for use in Integrated Urban Drainage (IUD) management are sometimes poor, not available or not fit for purpose (MSfW, 2005). Surface water flooding sources in urban areas include sewers and drains, pluvial and fluvial flooding. To consider simultaneously the often complex pathways of flooding from multiple sources requires 2D overland hydraulic models coupled to 1D subsurface sewer models. An IUD model embraces such enhancement to a Flood Risk Assessment (FRA) model in order to better simulate a range of flood scenarios and identify their associated flood hazard. This paper analyses the degree to which an existing ISIS/TUFLOW FRA model of an English Midland town is enhanced by dynamically linking the 2D overland model to a new 1D urban drainage and sewer network model developed using TUFLOW’s integral 1D software, ESTRY. Analysis concentrates on the inclusion of detailed roadside drainage features such as kerb-side gully inlets and connecting pipes which link the urban surface model to a subsurface sewer network. Discussion considers: (i) the IUD model linkage and the influence of network configuration; (ii) real-world application of IUD modelling to a range of hydrological events and associated flood hazard mapping and assessing the effect on predictions of extent and depth; and (iii) assessing the relevance of integrating urban drainage features in large-scale and catchment FRA modelling.
Year: 2010