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MODSIM-DSS ia an open-source decision support system with a graphical user interface (GUI) that allows users to create any river basin topology. The system can account for surface water rights, storage rights, instream rights, and water availability. Operates on desktop computers operating under MS Windows using the .NET Framework. GEO-MODSIM, is a full implementation of MODSIM operating as a custom extension in ArcGIS (ESRI, Inc.), allows automatic generation of MODSIM networks from geometric networks and processing of spatial database information in a GIS.

Geographic Location

Applicable throughout the western United States or in regions with comparable water allocation systems.


Surface water data and water rights data


Water availability at nodes and potential system optimization

Linkage to Other Models

Input from MODFLOW groundwater models has been linked to MODSIM

Level of Effort

This model requires a strong understanding of water rights and local knowledge of the system. It requires an up-front investment in understanding MODSIM and developing the model.

Basin Scale Opportunity Assesment