Hydrologic Unit Modeling for the United States

[1][2][3][4] Most of the project activity took place from 1992–1996, and work continues to this day through the Conservation Effects Assessment Program (CEAP.

The modeling work used the Soil & Water Assessment Tool (SWAT) developed by Jeff Arnold, Jimmy Williams and others at USDA-Agricultural Research Service (ARS) in Temple, Texas.

Additional development support was provided by the Texas A&M Blackland Research & Extension Service AgriLife Center employees Raghavan Srinivasan, Ranjan Muttiah, Paul Dyke, Allan Jones among others.

Mike Hutchinson from the Australian National University was visiting the A&M center at that time and provided assistance with elevation data modeling.

Significance of the project was the early use of national level Geographic Information Systems (GIS) datasets for environmental assessment.