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United States Department of Agriculture

Agricultural Research Service

Water Erosion Prediction Project

The Water Erosion Prediction Project (WEPP) model is a process-based, distributed parameter, continuous simulation, erosion prediction model for use on personal computers running Windows 95/98/NT/2000/XP/Vista/Windows7. The current model version (v2012.8) available for download is applicable to hillslope erosion processes (sheet and rill erosion), as well as simulation of the hydrologic and erosion processes on small watersheds. Included in the download package is the WEPP model (version 2012.8), WEPP Windows interface (August 2012), CLIGEN climate generators (versions 4.3 and 5.3), documentation and example data.

SWCS WEPP Workshop - July 27, 2014
In conjunction with the 2014 SWCS International Conference a WEPP model application professional development workshop is being offered on Sunday, July 27, 2014 from 1:00-
5:00 p.m. in Lombard, Illinois.
WEPP Workshop Information and Agenda
SWCS Conference Website

Documentation
Overview of Soil Erosion
WEPP Model v2012.8 Release Notes

WEPP Model Documentation
WEPP Publications Bibliography List
Agricultural Research magazine article on WEPP
WEPP Windows Frequently Asked Questions 
WEPP Windows Interface Tutorial (PDF 5mb)

Using Tile Drainage with version 2012.8 (PDF)

Historic Background on Soil Conservation Research(PDF 7mb)

WEPP Development History(PDF 9mb)


Downloads

Download WEPP for Windows (August 2012)

Previous versions of the model are also available from the download page.

WEPP Windows 7 and Vista Install Notes


Climate Data

CLIGEN  Information
Using Climate data in WEPP Windows

Breakpoint Climate Generator


Cligen parameter files for about 2600 stations in the US are included in the install package.

12/11/2008 - Cligen PAR file documentation for wind speed and wind speed standard deviation should be stated in units of m/s. In addition to the  input file for Cligen (PAR file), the Cligen output file and WEPP model use units of m/s for wind speed. The corrected Cligen PAR file documentation is available here. The WEPP model, Cligen model and climate data files have not changed.

Soil Data

Soil parameter inputs for WEPP are based on 1992 SOILS-5 data. The install package includes soil archive files for each state. These archives can be used with the WEPP Windows Interface by selecting the Tools menu and then Soil Archive Program.

Management Data

Example managements for agriculture, rangeland and forest are included in the install package.

Related Software

A Web browser interface to WEPP model. Run WEPP simulations without having to download the software, simulations are run on servers at the NSERL.  

Forest Service WEPP interfaces.The US Forest Service has developed specific web based interfaces for western forest and logging activities.

A GIS interface GeoWEPP, is available for WEPP. This is an ESRI ArcGIS extension that uses DEM data to derive topography inputs for WEPP.

DOS Interface file builders for WEPP. (1995) This software is no longer being updated but is available for download.

WEPP Validation Data Sets. For use with WEPP model (without interface), for hillslope and watershed.

CPIDS.(1997) Crop Parameter Knowledge Based System. CPIDS was developed to assist crop database builders and users of RUSLE and WEPP in interpretation of plant characteristics and selection of plant parameters. RUSLE, WEPP and other erosion prediction and natural resource models require detailed input parameters including those describing cropping systems. This software is no longer being updated but is available for download.


Comments or suggestions regarding WEPP: e-mail wepp@ecn.purdue.edu


Last Modified: 4/18/2014