GeoSWMM Version 6.0

GeoSWMM 6 introduces updates to 2D modeling, watershed delineation, results visualization, and flood mapping workflows. This release focuses on making common modeling tasks more intuitive and reliable, while also resolving several model configuration and export issues.

This release is designed for GeoSWMM workflows in ArcGIS Pro. Before upgrading, review project dependencies, data sources, and any organization-specific deployment requirements to confirm that existing projects can be opened, validated, and exported as expected.

New Features and Workflow Updates

Guided 2D Modeling Workflow

GeoSWMM 6 introduces a guided 2D modeling workflow that organizes the complete model setup into a clear, step-by-step process.

You are guided through each stage in sequence—from defining the 2D boundary and creating 2D nodes and layers to establishing 1D–2D connections—so dependent setup tasks are completed in the appropriate order. Your progress is saved as each step is completed, and you can return to previously completed steps to review or modify settings before continuing.

The updated workflow brings 2D model setup into a single, organized interface that's easier to follow from start to finish.

Watershed Delineation Workflow Updates

The Watershed Delineation Tool has been revised with a more intuitive input-selection process and a logical workflow that adapts to your project type and available data, whether you are working with an urban catchment, a mixed watershed, or a natural watershed.

You can choose the input approach that best fits your project—using an existing sewer network, adding stream data, or creating streams from terrain. Based on your selection, the workflow presents the appropriate outlet options and required inputs.

Each input option includes a visual example and a description of the expected model configuration, helping you understand the intended setup before proceeding.

Additional improvements include:

• Select a Project Outfall from the Map – You can choose an existing node from either the sewer network or natural stream network and designate it as the project outfall, right from the map.
• Automatic Snapping for Outlet Placement – When drawing a subcatchment outlet or project outfall, GeoSWMM automatically snaps the location to the applicable stream or sewer network, helping you place outlets consistently with the drainage system.

Together, these updates provide a clearer path from input selection through outlet definition and watershed delineation, making the overall setup easier to understand and complete.

Results Visualization Interface Updates

The Results interface has been updated to provide a more consistent experience within ArcGIS Pro, with result views, controls, and visualization options organized more clearly across the workflow. You can move more easily between available result displays, locate commonly used controls, and review simulation outputs with fewer interface changes between tools. The updated layout also provides a more unified way to explore and interpret model results directly within the ArcGIS Pro environment.

Flood Mapping Tool Enhancements

The Flood Mapping tool, including the Generate Flood Raster workflow, now uses a dockable interface that integrates more seamlessly with GeoSWMM and the ArcGIS Pro environment. You can keep the tool available alongside the map while reviewing settings, working with model results, and generating flood visualization outputs.

Resolved Issues