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High radium (Ra) concentrations in potable portions of the Cambrian-Ordovician (C-O) aquifer system were investigated using water-quality data and environmental tracers ( 3H, 3Hetrit, SF6 , 14C and 4Herad) of groundwater age from 80 public-supply wells (PSWs). Groundwater ages were estimated by calibration of tracers to lumped parameter models and ranged from modern (1 Myr) in the most downgradient, confined portions of the potable system. More than 80 and 40 percent of mean groundwater ages were older than 1000 and 50,000 yr, respectively. Anoxic, Fe-reducing conditions and increased mineralization develop with time in the aquifer system and mobilize Ra into solution resulting in the frequent occurrence of combined...
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The U. S. Geological Survey (USGS) makes long-term seismic hazard forecasts that are used in building codes. The hazard models usually consider only natural seismicity; non-tectonic (man-made) earthquakes are excluded because they are transitory or too small. In the past decade, however, thousands of earthquakes related to underground fluid injection have occurred in the central and eastern U.S. (CEUS), and some have caused damage. In response, the USGS is now also making short-term forecasts that account for the hazard from these induced earthquakes. A uniform earthquake catalog is assembled by combining and winnowing pre-existing source catalogs. Seismicity statistics are analyzed to develop recurrence models,...
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This EnviroAtlas web service supports research and online mapping activities related to EnviroAtlas (https://www.epa.gov/enviroatlas). The Clean and Plentiful Water category in this web service includes layers illustrating the ecosystems and natural resources that filter and regulate water, the need or demand for clean and plentiful water, the impacts associated with water quality, and factors that place stress on water quality and supply. EnviroAtlas allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the conterminous United States. Additional descriptive information about each attribute in this web service is located within each web...
Types: Citation; Tags: 12-digit HUCs, Agriculture, Air, Alabama, Alaska, All tags...
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Synopsis: This article outlines how wetlands can significantly reduce flooding in the Upper Mississippi watershed. The authors first provide a historical context by estimating the original and lost wetland storage capacities of the Upper Mississippi and Missouri River Basins. Historically, about 10% of the basin would have been classified as wetland in 1780. By 1980, wetland acreage had been reduced to only 4% of the basin, representing about 26 million acres of wetlands eliminated since 1780. The area of wetland restoration required to reduce the risk of future flooding adequately was estimated based on the total amount of excess floodwater beyond bank-full discharge that passed through the City of St. Louis during...


map background search result map search result map Flood reduction through wetand restoration: the Upper Mississippi River Basin as a case history. EnviroAtlas - Clean and Plentiful Water Metrics for the Conterminous United States USGS Topo Map Vector Data (Vector) 34433 Patzau, Wisconsin 20220429 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 34965 Phillips WI (published 20240103) Shapefile USGS Topo Map Vector Data (Vector) 36437 Priest Lake WI (published 20240103) Shapefile USGS Topo Map Vector Data (Vector) 3271 Belvidere NE, Illinois 20210628 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 31412 Naults MI (published 20231223) Shapefile USGS Topo Map Vector Data (Vector) 20261 Hewitt WI (published 20240103) FileGDB USGS Topo Map Vector Data (Vector) 24197 Lac du Flambeau SW WI (published 20240103) FileGDB USGS Topo Map Vector Data (Vector) 26054 Little Sturgeon WI (published 20240103) Shapefile USGS Topo Map Vector Data (Vector) 35135 Pike Lake SE WI (published 20240103) FileGDB USGS Topo Map Vector Data (Vector) 47051 Vulcan MI (published 20231224) Shapefile USGS Topo Map Vector Data (Vector) 19563 Harvard, Illinois 20210628 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 23232 Kempster WI (published 20240103) Shapefile USGS Topo Map Vector Data (Vector) 42505 Spirit WI (published 20240103) Shapefile USGS Topo Map Vector Data (Vector) 47067 Wabasha North, Minnesota 20220502 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 47874 Weaver, Minnesota 20220507 for 7.5 x 7.5 minute FileGDB 10.1 USGS National Map Index Names (published 20240120) Shapefile Data for Radium Mobility and the Age of Groundwater in Public-drinking-water Supplies from the Cambrian-Ordovician Aquifer System, North-Central USA: Table 3. Detailed information on calculations of environmental tracer data. USGS National Map Index Names (published 20240120) Shapefile Flood reduction through wetand restoration: the Upper Mississippi River Basin as a case history. Data for Radium Mobility and the Age of Groundwater in Public-drinking-water Supplies from the Cambrian-Ordovician Aquifer System, North-Central USA: Table 3. Detailed information on calculations of environmental tracer data. EnviroAtlas - Clean and Plentiful Water Metrics for the Conterminous United States