GeoSWMM 2D Modeling

GeoSWMM 2D is an advanced tool that enhances the capabilities of the US EPA SWMM 5 engine by enabling the modeling of two-dimensional (2D) surface flow. It allows for simultaneous analysis of both one-dimensional (1D) and 2D domain, providing comprehensive insights into flood dynamics. With GeoSWMM 2D, users can analyze, visualize, derive and export meaningful results, including detailed flood maps, essential for understanding widespread urban flooding.

Traditional 1D solutions often fall short in analyzing overland flooding due to their limited ability to define flow routes in open spaces, which can change with urban development patterns. In such cases, 2D flood modeling for overland flow becomes crucial. In urban areas with stormwater drainage systems, an integrated 1D-2D approach is necessary to accurately represent hydrodynamic conditions. GeoSWMM 2D achieves this by coupling 1D stormwater drainage overflow modeling with 2D mesh/grid modeling for urban area and even quasi-2-D modeling for river overbank flooding. This approach uses the typical formulation of the 1D depth-averaged momentum and continuity equations (St-Venant equations) for homogeneous fluids, solved along each component of the 2D computational cell over a network of junctions and open conduits representing the hydrography, bathymetry or topography of the area. Thus, GeoSWMM 2D offers a quasi-two-dimensional representation.

The integration with ArcGIS functions and tools makes GeoSWMM 2D exceptionally powerful for various applications, including urban flood risk assessment, river and stream flood modeling, stormwater management, infrastructure resilience planning, and climate change adaptation. In urban settings, it helps identify high-risk flood zones and design effective drainage systems to mitigate flood impacts. For rivers and streams, GeoSWMM 2D accurately simulates floodplain inundation, aiding in floodplain management and emergency planning. In stormwater management, it models surface runoff and drainage infrastructure performance, supporting sustainable urban drainage systems. The tool also evaluates the resilience of critical infrastructure to flooding, ensuring robust designs that can withstand extreme weather events. Additionally, GeoSWMM 2D simulates future climate scenarios, helping cities develop long-term strategies to adapt to increased rainfall intensity and sea level rise, ultimately enhancing overall flood resilience and sustainability.