What aquifer systems did NAWQA sample?
An aquifer is a water-bearing layer of soil, sand, gravel, or rock that will yield usable quantities of water to a well. NAWQA sampled both shallow and deep aquifer systems to characterize different groundwater resources. Shallow parts of aquifer systems (less than 100 feet deep) were sampled by installing monitoring well networks to characterize recently recharged groundwater beneath specific land-use settings (urban, agricultural, undeveloped) in different environmental settings. These land-use studies were used to relate nutrient occurrence to individual types of nonpoint sources. Deep groundwater was sampled primarily from domestic wells and to a lesser extent public-water supply wells that tap into major aquifers (regionally extensive aquifers that are important groundwater resources for water supply) in areas of mixed land uses to evaluate the integrated effects of multiple sources of nutrients on their occurrence and concentrations. NAWQA conducted 180 studies that included agri
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