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 IWFM: Integrated Water Flow Model Version 4.0.0331

IMPORTANT NOTE: Starting with IWFM v4.0.266, the definition of irrigation trigger minimum soil moisture for non-ponded crops is changed. In the previous revisions, it was defined as a fraction of the field capacity whereas, starting with IWFM v4.0.266, it is defined as a fraction of Total Available Water (TAW = field capacity - wilting point) which is consistent with the definition listed in FAO Paper 56 (Allen et al., 1998). If migrating an existing IWFM v4.0 application from the previous revisions to this revision, it is important to note this change in the definition and update the values of irrigation trigger minimum soil moisture accordingly. However, if wilting point was set to zero in the existing application, there is no need to update the irrigation trigger minimum soil moisture values.


Release Notes
This document lists the modifications and enhancements that are included in this version of IWFM.

Executables
This file includes both the 32 bit and 64 bit executable files for IWFM v4.0 (Preprocessor, Simulation, Budget, and Z-Budget). When unzipped, the files will be restored into predefined directories, namely Preprocessor, Simulation, Budget, and Z-Budget. These executables are created by Intel Visual Fortran Composer XE 2015.0.108 compiler. 64 bit executables have "x64" as part of their filename (e.g. "Simulation4.0_x64.exe"). Executables with "D" extension (e.g. "Simulation4.0_x64_D.exe") are in debug mode. It is recommended that the executables in debug mode are used when building a model from scratch. Once the model is built and debugged, the executables in release mode (e.g. "Simulation4.0_x64.exe") can be used for production.

Templates for Input Files
This file includes the templates for input files that are necessary to run Preprocessor, Simulation, Budget, and Z-Budget parts of IWFM v4.0. When unzipped, these files will be restored into predefined directories, namely Preprocessor, Simulation, Budget, and Z-Budget.

Source Code
This file contains the Fortran source code for IWFM v4.0, and for IWFM_Util and Package_RootZone libraries that are required to create Preprocessor, Simulation, Budget, and Z-Budget executables. The source code has been compiled and tested using Intel Visual Fortran Composer XE 2015.0.108. When unzipped, the files will be restored into predefined directories. Microsoft Visual Studio 2010 configuration files have also been included for users interested in compiling the source code using Intel Visual Fortran and building the IWFM executables from scratch. The main configuration file, "BuildAll.sln" solution file, can be found under the folder "BuildAll". This solution file can be opened with Microsoft Visual Studio 2010 and the IWFM executables can be built from scratch. The executables will be saved under the folder "Bin".

Sample Problem
This file contains the IWFM input and output files for a sample problem. A description of the problem is also included. When unzipped, the files will be restored into predefined directories, namely Preprocessor, Simulation, Budget, and Z-Budget.

Documentation
IWFM documentation is available in PDF format. The complete documentation consists of three .pdf files: Theoretical Documentation, detailing the principles, theories, and assumptions that form the engine for IWFM, a User's Manual which is a guide for individuals using IWFM for various applications, and the documentation for the sub-domain water budgetting post-processor (Z-Budget).

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