Overview of GeoSWMM 2D Modeling Approach

GeoSWMM 2D follows the Quasi-2D modeling approach that seamlessly integrates the traditional 1D and 2D models using the same hydraulic computations employed in EPA SWMM5. While keeping the hydrologic module of EPASWMM5 unchanged, the hydraulic network is modified to a 1D-2D framework. This approach allows users to prepare a detailed 2D terrain representation of the study area using high-resolution elevation data while maintaining computational efficiency. GeoSWMM 2D is grounded in the principles of flow in open channels and pipes, making it highly suitable for flood modeling, stormwater management, river basin modeling, and other scenarios where detailed terrain representation and hydraulic accuracy are required/crucial.

This model assists/excels in representing the topography of the area being studied in a 2D grid, offering the flexibility in defining variations in elevation, land uses and hydrologic differences. It enables users to analyze the behavior, interaction, and response of water flow between natural channels and flood plains. In this quasi-2D modeling framework couples 1D-2D models with hydraulic interfaces like orifices, weirs or direct connections, facilitating comprehensive floodplain and channel flow simulations.

GeoSWMM 2D runs the model for user specified storm or flood event which quantifies the flow within the channels and transferring it to the 2D grid to simulate floodplain flow. This capabilities allows for a detailed understanding of water depth variations within the 2D grid, helping to determine the maximum extent of inundation and the maximum water surface elevation (WSE) across the 2D grid. By offering these insights, GeoSWMM 2D allows for accurate representation of complex hydrological processes, making it an essential tool for urban planners, engineers, and environmental scientists. This guide provides an overview of how to work with a GeoSWMM 2D project, from initial setup to running simulations and analyzing results.