2-D hydrological model application at Plot Scale for Evaluating Rain Garden Effectiveness in Flood Management

Pluvial floods, recognized as one of the most significant threats in urban areas lead to risks in urban water management and cause extensive damage to infrastructures and properties. Due to climate change, European countries are anticipated to experience more frequent and severe flood events. Therefore, the implementation of appropriate measures for flood mitigation is essential. Rain gardens, a type of nature-based solution (NBS), are crucial strategies to support sustainable flood risk management. However, to assess long-term impacts in light of climate change and to guide the development and implementation of additional measures in the region, the application of modeling techniques is essential. A robust modeling approach provides valuable insights for decision-making and also helps stakeholders and practitioners evaluate strategies and design future measures. This study aims to compare different modeling approaches by using FLO-2D PRO to simulate the impact of rain gardens on surface runoff mitigation. To this end, inflow and outflow data collected at the plot scale were used to compare and evaluate the outcomes of the analyzed approaches. The findings have deepened the understanding of simulation techniques for these structures, highlighting the advantages and disadvantages of different model implementations. This has enhanced the application of the model in this field, leading to more reliable results.