P8 Urban Catchment Model
William W. Walker, Jr., Ph.D.

Jeffrey D. Walker, Ph.D.

USEPA, Minnesota PCA,  & Wisconsin DNR

******** Model Update Available ********

Download Latest Version (3.5) March 2015

Compatible with Windows 10 & Excel 2013

Download Version 3.4

Version Notes  Installation Instructions  Documentation  P8 Web Site User Forum

This page appears each time you run P8 if you are connected to the Internet.  Its purpose is to provide current information on model release and related matters.

The P8 User Forum can be used to post questions and share experiences.

P8 Version 3.4 is not compatible with Excel 2013. It seems to work with Excel 2003 and 2013 co-installed in Windows-7, but has not been extensively tested. See User Forum message for details. It has not been tested on Windows 8.x. Please check the Forum for further updates.

Version 3.4 is compatible with MS Windows XP & 7 and MS Office 2003-2010.  In Windows 7, the default program location specified in the setup procedure:  "C:/Program Files/P8 Urban Catchment Model..."   must be moved outside of the "/Program Files" directory, e.g. to "C:/P8/...".    See installation instructions .

Review Version Notes before installing.  Install the latest version using the above link if the version number does not match the one you are currently using.   If you have problems with installation, try manually uninstalling previous Windows versions via the Windows Control Panel before running the setup utility.  The DOS version can remain on your system if desired.    

The latest version supports input files from all previous versions.  If your input files are stored in the default program directory for a previous version, they should be copied into the program directory for the new version.  This can be done after installation.

P8 requires the Microsoft .Net Version 2.0 framework, which will be installed automatically when P8 is installed. 

Version 1 (1990) documentation provides detailed descriptions of algorithms and calibrations.  Updates are described in the documentation for the current windows version.

The Windows version basically translates the DOS version with more bells/whistles and revised input/output formats.  Most of the underlying algorithms and calibrations (now 15-20 years old) have not been changed.   As far as I know, mass is still conserved and suspended particles still settle at about the same rate as they did in the 1980's, so the underlying concepts and calibrations are still valid. 

With the exception of street-sweeping efficiency factors, the default particle calibrations (NURP50, NURP90) based on information available as of 1990 have not been modified, users can create their own particle calibrations based on more recent and/or site-specific data.   If the default calibrations are used, the user (not P8)  assumes that they are valid.

Please send me an email if you download the program so that I can maintain a list of users.   Please report problems or suggestions and post them at the P8 User Forum.


Email: bill@wwwalker.net

Home Page: http://www.wwwalker.net       

http://www.wwwalker.net/p8/splash.htm                                         06/20/2013