Introduction
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FloPy includes support for MODFLOW 6, MODFLOW-2005, MODFLOW-NWT, MODFLOW-USG, and MODFLOW-2000. Other supported MODFLOW-based models include MODPATH (version 6 and 7), MT3DMS, MT3D-USGS, and SEAWAT.

For general modeling issues, please consult a modeling forum, such as the [MODFLOW Users Group](https://groups.google.com/forum/#!forum/modflow).  Other MODFLOW resources are listed in the [MODFLOW Resources](https://github.com/modflowpy/flopy#modflow-resources) section.


Documentation
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Documentation is available on [Read the Docs](https://flopy.readthedocs.io)
and includes information on FloPy; tutorials for using FloPy with MODFLOW 6
and previous versions of MODFLOW, MT3DMS, MT3D-USGS, MODPATH, and ZONEBUDGET;
and code documentation.


Contributing
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Bug reports, code contributions, or improvements to the documentation are welcome from the community. Prior to contributing, please read up on our guidelines for [contributing](https://github.com/modflowpy/flopy/blob/develop/CONTRIBUTING.md) and then check out one of our issues in the [hotlist: community-help](https://github.com/modflowpy/flopy/labels/hotlist%3A%20community%20help).


How to Cite
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*Citation for FloPy:*

[Bakker, Mark, Post, Vincent, Langevin, C. D., Hughes, J. D., White, J. T., Starn, J. J. and Fienen, M. N., 2016, Scripting MODFLOW Model Development Using Python and FloPy: Groundwater, v. 54, p. 733–739, doi:10.1111/gwat.12413.](https://doi.org/10.1111/gwat.12413)

*Software/Code citation for FloPy:*

[Bakker, Mark, Post, Vincent, Hughes, J. D., Langevin, C. D., White, J. T., Leaf, A. T., Paulinski, S. R., Bellino, J. C., Morway, E. D., Toews, M. W., Larsen, J. D., Fienen, M. N., Starn, J. J., Brakenhoff, D. A., and Bonelli, W. P., 2025, FloPy v3.9.5: U.S. Geological Survey Software Release, 01 October 2025, https://doi.org/10.5066/F7BK19FH](https://doi.org/10.5066/F7BK19FH)
