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Watershed characteristics for study sites of the Surface Water Trends project, National Water Quality Program This product consists of 29 datasets of tabular data and associated metadata for watershed characteristics of 1,530 study sites of the Surface Water Trends (SWT) project of the U.S. Geological Survey’s (USGS) National Water Quality Program (NWQP). The project is conducting national studies of trends in water quality of streams and rivers for periods ranging from 10 to 40 years, between 1972 and 2012. The data here include both static and time-series characteristics. Static data include primarily physical characteristics which have changed little over this period, such as geology, soils, and topography. Time-series data represent characteristics which may or may not have changed over time, such as land use, agricultural... Categories: Data; Types: Citation; Tags: Atmospheric Deposition, Basin Morphology, Census of Agriculture, Conterminous US, Crop Practices, All tags... Crop Reserve Program, Fertilizer, Forest Canopy, Geographic Information Systems, Geology, Geospatial Analysis, Geospatial Datasets, Housing, Hydrologic Modifications, Hydrology, Imperviousness, Income, Land use, Land use change, Manure, Minerals and Metals, NHDPlus, Net Primary Productivity, Nitrogen application, Normalized Difference Vegetation Index, Oil and Gas, Phenology, Phosphorus application, Point Source, Population change, Precipitation, Protected Areas, Puerto Rico, Regions, Riparian Land Use, Roads, Snow cover, Soils, Temperature, Topography, Trends, USGS Science Data Catalog (SDC), United States, Urbanization, Water Use, Watershed, Watershed boundaries, inlandWaters, Fewer tags Mercury and Methylmercury Concentrations and Litterfall Mass in Autumn Litterfall Samples Collected at Selected National Atmospheric Deposition Program Sites in 2007-2009 and 2012-2015 Mercury (Hg) is a persistent environmental contaminant and can accumulate and concentrate in food webs as methylmercury (MeHg), presenting a health risk to humans and wildlife. Multiyear monitoring and modeling studies have shown that atmospheric Hg in litterfall is an important form of Hg deposition to forests. Annual litterfall consists primarily of leaves with some amounts of needles, twigs, bark, flowers, seeds, fruits, and nuts. Atmospheric Hg accumulates in leaves and reaches an annual maximum concentration at autumn leaf drop. This data set is derived from autumn litterfall collected at 30 selected National Atmospheric Deposition Program (NADP) Mercury Deposition Network (MDN) sites in deciduous and mixed... Categories: Data; Types: Citation; Tags: Environmental Health, Georgia, Indiana, Kentucky, Maryland, All tags... Michigan, Minnesota, Missouri, New York, Ohio, Pennsylvania, South Carolina, Tennessee, USGS Science Data Catalog (SDC), Vermont, Virginia, West Virginia, Wisconsin, atmospheric deposition, mercury, Fewer tags