A five-year study by the U.S. Geological Survey's Wisconsin Water Science Center has confirmed that even simple, residential-style rain gardens can capture nearly 100 percent of stormwater runoff from the roof of an adjacent building, even in thick clay soils. The key in temperate climates is to use native prairie vegetation, the long roots of which can penetrate the silt/clay layer of the subsoil, according to the study.
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