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Mixtures of organic chemicals are ubiquitous in small U. Geological Survey. In many streams the mixtures could be affecting stream organisms. Looking for data? New Water-Quality Directions.
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Pesticide Use Maps and Data. InCongress established the National Water-Quality Assessment NAWQA Project to address where, when, why, and how the Nation's water quality has changed, or is likely to change in the future, in response to human activities and natural factors. Users here access an online mapping tool to compare water quality at small streams across a region, see scorecards that summarize stream health at each stream site, and download data for hundreds of chemical compounds. Water Quality in Rivers and Streams: Current Conditions teh Long-Term Trends Knowing the current water-quality conditions of our rivers and streams and where those conditions have improved or deteriorated is critical information for resource managers and the public.
The online w ater-quality trends mapping tool allows users to visualize trends in water chemistry nutrients, pesticides, sediment, carbon, and salinity and aquatic ecology fish, invertebrates, and algae. Users can explore relations between human activities, natural processes, and contaminant transport using interactive mappers.
From left: Aquatic sampling during Southeast Stream Quality Assessment; velocity measurement at Truckee River, Nevada; wrestling with cages of fathead minnows in Goodwater Creek, Missouri, during high flow. Concentrations of inorganic constituents, such as arsenic and nitrate, and organic constituents, such as pesticides and volatile organic compounds, are compared to benchmarks established for the protection of human health.
Surface-Water Quality and Ecology
Users can access an online tool to see how concentrations of pesticides, nutrients, metals, and organic contaminants in groundwater are changing during decadal periods across the Nation, and see in real time how chemical properties of groundwater at some sites are fluctuating. Groundwater Quality: Predictions for Unmonitored Areas Groundwater hydrologists are developing statistical models that predict andd a contaminant is likely to occur in groundwater and at what concentration. These models extrapolate groundwater quality in areas and at depths where groundwater has not yet been sampled.
Users can see predicted contaminant concentrations in map view, and—for some aquifers—in 3-D. Integrated Watershed Studies Surface water and groundwater are intimately connected and are constantly interacting. The Integrated Watershed Studies team is go here how water and chemicals move between the landscape, streams and rivers, and groundwater.]
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