This chapter first presents the main challenges of urban environments in terms of stormwater management and the potential role of nature-based solutions (NbS). Secondly, it highlights the potential of computational approaches to model and simulate the performance of NbS for stormwater retention, addressing the aforementioned impacts of climate change and environmental issues. An overview of existing tools is provided, along with a detailed description of the input parameters required for analysis and simulation, and the expected outcomes are illustrated. Two models are selected based on the requirements for their integration into the design process, tested, and applied to a generic urban canyon with various NbS. This allows for a discussion of the potential and limitations of the most relevant strategies selected, as well as an evaluation of the usability and suitability of the chosen tools.