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In future years, economic development, urbanisation and heavy rainfall events are expected to increase in urban areas, in particular in developing countries. It is well known that urban development has a strong impact on the water cycle such as increase of flood peaks and volume, decrease of base flow, hydraulic stress and water pollution. Resilience measures are still needed to improve urban flood risk, the possibilities to provide indicators that could be used to characterize urban resilience related to flooding is outmost importance. The work described here presents an optimisation framework for urban drainage rehabilitation that incorporates in the decision space the concept of resilience in order to find an optimal rehabilitation strategy. The approach has been tested in the City of Dhaka, Bangladesh by coupling 1D/2D model of the drainage system and linked within the optimisation algorithm. The preliminary results obtained suggest that the proposed approach could be effective in order to reach acceptable level of flood resilience of urban drainage systems, balancing investment and risk within the systems. Further work is recommended to expand and generalize the methodology.


Session R40, Assessment, Prediction, and Management of Flood Events II



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