Drainage Map of Surveyed Watersheds (IMAGE)

University of Iowa

Drainage Map of Surveyed Watersheds

Caption

This map shows how poorly drained the land in the study's observed watersheds area. The darker colors indicate that there are more poorly drained fields in a region, meaning that water leaving farm fields passes easily into the local watershed without being filtered, taking more nutrients with it.

Credit

Image courtesy of Iowa Geological Survey.

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Use only with credit.

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