Hidden dune filters treat coastal stormwater runoff Researchers from North Carolina State University have developed low-cost stormwater filtration systems that are concealed beneath sand dunes and filter out most of the bacteria that can lead to beach closures. The researchers designed and built two such systems in Kure Beach, N.C., that consist of large, open-bottomed chambers that effectively divert the stormwater into dunes, which serve as giant sand filters. The systems are built under dunes that are covered with vegetation. The researchers then launched a three-year study to see how the filters would perform. The dune infiltration systems reduced the concentration of bacteria in stormwater runoff by 96 percent.
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