FloPy₃ includes support for MODFLOW-2000, MODFLOW-2005, and MODFLOW-NWT. Other supported MODFLOW-based models include MODPATH (version 6), MT3D and SEAWAT.

FloPy₃ is significantly different from FloPy₂ (hosted on googlecode). The main changes are:

• FloPy₃ is fully zero-based. This means that layers, rows and columns start counting at zero. The reason for this is consistency. Arrays are zero-based by default in Python, so it was confusing to have a mix.
• Input for packages that take layer, row, column, data input (like the wel or ghb package) has changed and is much more flexible now. See the notebook flopy3boundaries
• Support for use of EXTERNAL and OPEN/CLOSE array specifiers has been improved.
• load() methods have been developed for all of the standard MODFLOW packages and a few less used packages (e.g. SWI2).
• MODFLOW parameter support has been added to the load() methods. MULT, PVAL, and ZONE packages are now supported and parameter data are converted to arrays in the load() methods. MODFLOW parameters are not supported in write() methods. MULT package FUNCTION and EXPRESSION functionality are not currently supported.

Dependencies:

FloPy₃ requires NumPy 1.9 (or higher)

For base Python distributions:

To install FloPy₃ type:

pip install flopy

To update FloPy₃ type:

pip install flopy --upgrade

To uninstall FloPy₃ type:

pip uninstall flopy

For Anaconda distributions (osx-64 and win-64):

To install or update FloPy₃ with conda run:

conda install -c https://conda.binstar.org/jdhughes flopy

To uninstall FloPy₃ type:

conda remove flopy   

Development versions of FloPy₃:

To install the bleeding edge version of FloPy₃ from the git repository type:

pip install git+https://github.com/modflowpy/flopy.git

To update your version of FloPy₃ with the bleeding edge code from the git repository type:

pip install git+https://github.com/modflowpy/flopy.git --upgrade

Documentation for FloPy₃ is a work in progress. FloPy₃ code documentation is available at:

• http://modflowpy.github.io/flopydoc/

The following IPython Notebooks contain example FloPy scripts for a variety of models and FloPy features

• An overview of the options to enter layer,row,column,data values for packages such as the wel and ghb packages is given in the flopy3boundaries Notebook
• The lake example, a very simple FloPy₃ example of steady flow in a square model with a fixed head cell in the middle (representing a lake) in a 10-layer model.
• A variant of the water-table example, a very simple example of one-dimensional groundwater flow in an unconfined aquifer with recharge, from the MODFLOW-NWT documentation (http://pubs.usgs.gov/tm/tm6a37/). This IPython Notebook build files for MODFLOW-NWT.
• The Zaidel discontinuous water-table example, which simulates a discontinuous water table over a stairway impervious base, from http://onlinelibrary.wiley.com/doi/10.1111/gwat.12019/abstract. This IPython Notebook build files for MODFLOW-USG. (http://pubs.usgs.gov/tm/06/a45/).
• The Henry Problem, a simple saltwater intrusion model developed with Flopy and run using SEAWAT.

• Example 1 of the SWI2 manual, simulating a rotating interface.

• Example 4 of the SWI2 manual, upconing below a pumping well below a two-aquifer island system.

FloPy₃ scripts for running and post-processing the SWI2 Examples (examples 1 to 5) that are described in Bakker et al. (2013) are available:

• SWI2 Example 1

• SWI2 Example 2

• SWI2 Example 3

• SWI2 Example 4

• SWI2 Example 5

Note that examples 2 and 5 also include FloPy₃ code for running and post-processing SEAWAT models.

A few simple FloPy₃ tutorials are available at:

• http://modflowpy.github.io/flopydoc/tutorials.html

• MODFLOW and Related Programs
• Online guide for MODFLOW-2000
• Online guide for MODFLOW-2005
• Online guide for MODFLOW-NWT