Inherent uncertainties are the primary constraints and concerns for any robust urban flood management programme. Selection of better retrofitting options to tackle uncertainties involves the process of evaluating the technical and financial feasibility of a wide range of options. In this paper, we present a case study of a catchment in Ho Chi Minh City, Vietnam, where we apply evolutionary methods to search for optimal retrofitting opportunities to cope with uncertainties. Flexible options such as detention storage at nodes and provision of sustainable drainage systems have been identified. The optimal storage volumes for detention storage at the nodes and optimal coverage areas for sustainable drainage options to prevent flooding in Nhieu Loc – Thi Nghe basin, have been arrived at by integrating optimization techniques and a storm water management model. This case study demonstrates and paves the way for considering combined hydraulic modelling along with an optimization approach as the first step towards incorporating flexibility into urban drainage systems. A Real in Option framework to assess the flexibility is also presented.
Republished in part with permission from Radhakrishnan, M., Quang, C. N. X., Pathirana, A., Phi, H. L., Quan, N. H. and Ashley, R. (2014). Evaluation of Retrofitting Options in Urban Drainage Systems based on Flexibility: A Case Study for Nhieu Loc-Thi Nghe Basin in Ho Chi Minh City. In: Proceedings of 11th International Conference on Hydroinformatics – Informatics and the Environment: Data and Model Integration in a Heterogeneous Hydro World, 17-21 August, New York, United States.
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