Chloride and nitrate concentrations are rising and arsenic levels are holding steady or falling. Those are two of the conclusions from a U.S. Geological Survey assessment of changes in the nation’s ...
No audio available for this content. Topobathymetric digital elevation model of the confluence of the Potomac and Shenandoah Rivers at Harper’s Ferry, West Virginia. (Image: USGS) The United States ...
A WaterWatch map from the U.S. Geological Survey (USGS) shows countless rivers have already reached flood stage, with some of those rivers being measured 1,000 percent of their normal level or more.
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