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SWMM stands for Storm Water Management Model. It is a dynamic hydrology and hydraulics simulation software used for modeling the quantity and quality of stormwater runoff in urban areas. Developed by the United States Environmental Protection Agency (EPA), SWMM is widely used by engineers, planners, and researchers to assess the performance of stormwater management systems, evaluate the impacts of land development and climate change on urban drainage systems, and design effective solutions for mitigating flooding, erosion, and water pollution. The SWMM model simulates the flow of stormwater through various components of the urban drainage system, including streets, gutters, pipes, channels, detention basins, and control structures, accounting for factors such as rainfall intensity, land use, soil properties, topography, and hydraulic infrastructure. It can simulate both simple and complex stormwater management scenarios, allowing users to analyze the effectiveness of different strategies, such as green infrastructure, low-impact development, and flood control measures, in reducing runoff volume, peak flows, and pollutant loads. SWMM also includes capabilities for modeling water quality processes, such as pollutant buildup, washoff, transport, and treatment, enabling users to assess the environmental impacts of stormwater runoff and develop strategies for improving water quality in receiving water bodies. By providing a comprehensive and flexible platform for stormwater modeling and analysis, SWMM supports informed decision-making and sustainable management practices for urban water resources.