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.
640 pixels wide: (k8721-4.jpg)
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