The National Soil Erosion Research Laboratory
1985 - First major workshop on USLE revision and replacement held in West Lafayette, Indiana.
1985 - Creation of initial WEPP Core Team.
1987 - The four Government agencies developed a set of User Requirements which described the basic functions and science of WEPP.
1987~1988 - A large set of field experiments was conducted on both rangeland and cropland soils in order to determine the erodibility characteristics for a wide variety of soils.
1987~1989 - An initial version of the WEPP computer program was developed by ARS scientists at Tucson, Arizona and West Lafayette, Indiana. At the same time, a stochastic climate generation model was developed by ARS scientists in Durant, Oklahoma.
1989 - The first public release of WEPP was issued. Updated versions followed in 1990, 1991, and 1994.
1990~1994 - The WEPP computer code was reprogrammed to a set of coding standards in an attempt to make the code more maintainable, and improve the numeric operation efficiency.
1988~1993 - The Soil Conservation Service created a user interface called the Operational Computer Program (OCP) which allows SCS field users to create and save the topographic, soils, and plant/management information specific to particular tracts or fields of land.
1992~1995 - A large effort was made by the ARS to develop a "user friendly" interface for general WEPP users.1995 - Release of WEPP watershed/hillslope model at SWCS sponsored WEPP/WEPS Symposium, Des Moines, Iowa.
1998 -1999 - Beta versions of Window user interface for WEPP Hillslope model
2001 - Release of Windows user interface for Hillslope and Watershed model. Prototype Internet (WEB browser) and GIS interfaces for WEPP model