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Department of Water Resources

1416 9th Street,
Sacramento, Ca 95814

Mailing Address:
P. O. Box 942836,
Sacramento, Ca 94236-0001

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 IWFM: Integrated Water Flow Model - Support Tools

IWFM v3.02 GIS/GUI (Last updated: February 6, 2014)
This is a work-in-progress, beta version GUI that is integrated into ESRI's ArcGIS v10.0 under Windows 7 OS. Currently, it allows the user to bring the finite element grid, stream network, stratigraphy and initial conditions from an existing IWFM model into GIS environment. After downloading the setup executable file, double-click it and follow the instructions to install the GUI. After installation, start ArcMap and click the "IWFM v3.02 GUI" button.


IWFM Mesh Generator (Last updated: March 9, 2017)
This is a mesh generator that is integrated into ESRI's ArcMap software. It utilizes shapefiles to define model boundary, streams, enforcement lines, holes and wells to generate a triangular, quarilateral or mixed triangular-quadrilateral finite element mesh. It uses Triangle, developed by Dr. Jonathan Richard Shewchuk, and Gmsh, developed by Christophe Geuzaine and Jean-Fran├žois Remacle, as the mesh generator engines. The mesh can be converted to a shapefile to perform various data analysis to develop input data (e.g. soil properties, land use distribution, development of stratigraphic layers) for IWFM applications. Groundwater and stream nodes as well as finite elements can be numbered automatically and the IWFM mesh files can be exported to text files. After downloading the setup executable file, double-click on it and follow the instructions. After installation, start ArcMap and click the "IWFM Mesh Generator" button.


IWFM Tools Add-in for Excel 2007-2013 (Last updated: June 15, 2017)
(Download either for 32-bit MS Office or 64-bit MS Office)
This tool is tested under Windows 7 and installs as a new tab named "IWFM Tools" into Excel 2007, 2010 or 2013, and currently includes four utilities (Note: The Budget-To-Excel utility will no longer work for Budget binary files generated by IWFM v3.02 or v4.0):

  1. data column export to a text file
  2. Water Year-Month table generator
  3. Budget-To-Excel data import utility
  4. Z-Budget-To-Excel data import utility
The first utility is useful when IWFM input data is prepared in Excel and when this data needs to be exported into a text file with right-aligned data columns. The second utility is used to convert time series data into a Water Year-Month table and optinally generate charts. The third and fourth utilities are used to quickly import data from IWFM Budget and Z-Budget HDF5 files into Excel. After downloading the setup file, double-click it and follow the instructions for installation.


Soil Data Builder (Last updated: June 1, 2016)
This tool processes the SSURGO soil database from NRCS and creates text files that store root zone data required by IWFM and IDC. These text files can then be opened in ESRI's ArcGIS along with the SSURGO shapefiles, and processed to generate soil parameters to be input to IWFM or IDC models. This tool requires MS Access 2007 or higher to be installed on the user's computer. Once installed, you can find the tool under Start -> All Programs -> IWFM.


Soil Data Builder with GIS (Last updated: February 17, 2017)
This utility is the Soil Data Builder tool (above) that is integrated within ESRI's ArcMap. It processes multiple SSURGO soil database from NRCS for an IWFM or IDC application and generates the soil parameter values for model cells. This utility can also be used to generate soil parameters for any polygon layer, not just for IWFM or IDC model grids. The utility has been tested with ArcMap v10.3 under Windows 10 OS. After downloading the setup executable file, double-click on it and follow the instructions. After installation, start ArcMap and click the "IWFM SDB-GIS" command button.


IWFM PEST Utilities (Last updated: October 28, 2013)
These utilities are developed to aid the user in automatic calibration of an IWFM application by linking it to the Parameter ESTimation tool (PEST). The download includes the documentation, an example, executables for both Windows and Linux Ubuntu OS, and the source code for the utility programs.


Land Use Adjustment Preprocessor (Last updated: September 16, 2016)
(Download either for IWFM v3.x, IWFM v4.0 or IWFM-2015)
The land use adjustment preprocessor allows the user to generate a time series data set of elemental land use areas based on subregional or model-wide time series data and elemental survey data. The download includes the source code, executable program, example input and output files, and program description.

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