Daily streamflow datasets used to analyze trends in streamflow at sites also analyzed for trends in water quality and ecological condition in the Nation's rivers and streams (output)
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In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA)...
1991年，美国地质调查局（U.S. Geological Survey, USGS）启动了一项针对全美境内50余个主要流域的研究，作为国家水质评估计划（National Water-Quality Assessment, NAWQA）的组成部分……
