GSFLOW
U.S. Geological Survey (USGS)
USGS GSFLOW couples two established models: PRMS, which simulates watershed surface hydrology (runoff, infiltration, evapotranspiration), and MODFLOW, which simulates groundwater flow. In a single run it computes exchanges between streams, lakes and the aquifer, so you can test how pumping, land-use change or climate affect streamflow and the basin water budget. Suited to hydrologists, water-resources engineers and environmental consultants managing catchments. Limitations: it has no graphical interface of its own, so input files are prepared in a text editor or with helpers such as ModelMuse, and you need to understand both underlying models. USGS currently recommends version 2.2.1 because two bugs affecting soil-zone calculations were found in version 2.3.0.
Ratings & Reviews
| Licence type | Completely Free, Open Source |
|---|---|
| Licence terms | US government (USGS) software in the public domain: free of charge, with no licence and no restrictions on use, including commercial work. Source code is included in the download. Ready-to-run packages for Windows and Linux. |
| Platforms | Linux, Windows |
| Engineering field | Civil Engineering, Environmental & Water |
| Tool type | Hydrology & Drainage, Simulation & FEA |
| Vendor site | www.usgs.gov |
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Last verified: 2026-10-06
