PHABSIM Version 1.5 is a free download from this site, however, we require basic registration to provide information on any future updates to users who have downloaded from our site. You will be prompted to register once you click the download button. 

Miller Ecological Consultants, Inc has recompiled PHABSIM for Windows under contract to USGS. We acknowledge the Instream Flow Council (http://www.instreamflowcouncil.org/) for their assistance with the update of the PHABSIM software. PHABSIM Version 1.5 is provided here free as a supplemental download site in addition to the main USGS download site found here:http://www.fort.usgs.gov/Products/Software/PHABSIM/.

PHABSIM for Windows Version 1.2 was developed by USGS.  PHABSIM Version 1.5 is the same program but compatible with the Microsoft Windows 7 64 bit operating system.  The PHABSIM Labs and PHABSIM user manual can be found on the USGS site listed above. As of March 2012 the software has been tested with Windows 98, XP Pro, XP Pro 64 bit, Vista, and Windows 7 64 bit. 

The recompiled program has several minor changes:

• The data entry errors associated with the 3rd party software are reduced but not entirely eliminated.  The 3rd party software used in data entry is no longer supported and could not be updated at this time.
• Cross section stationing data is now checked for ascending sequential stationing and error codes triggered when non-ascending stationing occurs.
• Habitat suitability criteria can be entered either by single row or by cut and paste from spreadsheet data.
• Habitat suitability criteria are checked for duplicate are non-ascending data points for depth, velocity or channel index. Duplicate data trigger an error message to the user.  The data points are sorted into ascending order before the file is saved.

Users are encouraged to send us reports of any errors found when using the software. We will attempt to fix errors caused by the recompilation of the software. In addition, Miller Ecological Consultants, Inc. provides fee based support for field data collection, data set problems, PHABSIM training, and general consultation on instream flow studies. 

Installation instructions:

Download the file “SetupPHABSIM.exe” to your desktop

Double click on the icon named “SetupPHABSIM” and follow the instructions.

Note: Windows 7 may save the download file to the "Downloads" folder by default.  You can select "Run" when the download is complete to install PHABSIM or exit after download and copy "SetupPHABSIM.exe from the download folder to the desktop and then double click the icon.

Click to read the PHABSIM software disclaimer here: