Agricultural Pesticide Use Estimates for Selected Watersheds of the Surface Water Trends Project, 1992-2014, National Water Quality Program

The U.S. Geological Survey (USGS) National Water Quality Program (NWQP) provides an understanding of water-quality conditions; whether conditions are getting better or worse over time; and how natural features and human activities affect those conditions. The Surface Water Trends (SWT) project of NWQP evaluates the directions, periods, and statistical significance of trends in water quality in streams and rivers. This data release was generated for SWT and provides annual agricultural pesticide use (1992-2014) for selected watersheds where long-term water quality is measured and where subsequent trend analysis will be conducted. County-level pesticide use estimates for 33 compounds were allocated to agricultural land for 70 SWT watersheds.

美国地质调查局（U.S. Geological Survey, USGS）国家水质计划（National Water Quality Program, NWQP）旨在阐明水质现状、随时间推移的变化趋势，以及自然特征与人类活动对水质状况的影响。该计划下属的地表水趋势（Surface Water Trends, SWT）项目，评估溪流与河流水质变化趋势的方向、周期及统计显著性。本次发布的数据集专为SWT项目打造，涵盖了70个选定SWT流域1992-2014年的年度农业农药使用量；这些流域均布设了长期水质监测点位，并将开展后续趋势分析。研究以33种农药成分的县级使用量估算值为基础，将其分配至各SWT流域的农业用地范围中。