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United States Department of Agriculture

Agricultural Research Service

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Image Number K8721-4

Caption for December 2005 Agricultural Research magazine article, "Conservation: Are We Getting Our Money's Worth?" All CEAP watersheds use the SWAT computer model to predict effects of farm practices on water quality. Here, technician Jeff Nichols collects a sample from a watershed in Ames, Iowa, as part of earlier work to refine the model.

Caption for October 2002 Agricultural Research magazine article, "Texas SWAT Team Helps Clean the World's Water." Thirty years of data from many U.S. watersheds went into constructing the computer model called SWAT, used to predict the effects of farming practices on water quality. Water samples are still being collected weekly to validate the model. Here, technician Jeff Nichols collects a sample from the Walnut Creek watershed in Ames, Iowa, for analysis.

Photo by Keith Weller.

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Last Modified: 8/13/2016
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