![]() Numerical modeling, customized for the conditions of the case study, is proven to be an effective and robust tool to evaluate urban flood risks and to assess the performance of mitigation measures. Due to limitations arising from the housing layout and budgets, a feasible plan to implement both measures in selected regions, instead of all regions, is recommended as one of the top candidates from a cost-to-performance ratio perspective. Four flood mitigation plans were examined based on natural channel revegetation and the installation of gabion dams with detention basins. In order to simulate the extreme scenarios, 24-h design storms with return periods from 1 to 100 years with distinctive temporal and spatial distributions were constructed using both daily and hourly precipitation for each month of the rainy season (May–October). Issues associated with limited data and the corresponding modeling are discussed. ![]() The analysis is exemplified through case studies pertaining to a small community with dense housing and steep terrain in Tegucigalpa, Honduras, through numerical simulations with a customized self-contained hydrologic and hydraulic modeling software. This paper aims to demonstrate the research-to-application and operational use of numerical hydrologic and hydraulic modeling to (a) quantify potential flash flood risks in small urban communities with high spatial resolution (b) assess the effectiveness of possible flood mitigation measures appropriate for such communities and (c) construct an effective operational urban flash flood warning system. Further, priorities are defined for the main research gaps, and the emerging research methodologies can contribute to guide the management of WFFs in such regions. This chapter provides a state-of-the-art scientific basis in terms of integrated flash flood management. To achieve this goal, the project defines priorities for future research challenges and potential projects for WFFs. The objective of the international symposium on flash floods (ISFF) project has been to develop scientific understanding of WFFs in wadi systems monitor, model, and mitigate issue warnings and plan urban development by discussing and networking the strategies in the MENA region. The single management strategy under climate change impacts is not adequate to reduce flash flood risks an integrated strategy is required. In arid regions, single mitigation measures, including storage dams, recharge dams, artificial lakes and embankments, are implemented, although soft mitigation measures are not dominant, such as early warning systems. Due to rapid flow generation with sudden high flood peaks, spatiotemporal variability of rainfall occurrence, and poorly sited rapid development, most Middle East and North Africa (MENA) region have no comprehensive proper protection from WFFs. Sustainable management of wadi flash flood (WFF) risks is desperately needed to secure development in wadi systems.
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