Water-quality and streamflow datasets used in Seasonal Kendall trend tests for the Nation’s rivers and streams, 1972-2012 (input)

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50余个主要河流流域的研究，作为全国水质评估计划（National Water-Quality Assessment, NAWQA）的组成部分……