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Keywords: Grass lined channel NRCS.jpg swale or bioswale in the United States http //www il nrcs usda gov/technical/engineer/urban/standards/urbst840 html U S Department of Agriculture Natural Resources Conservation Service Natural Resources Conservation Service NRCS 2002-11 PD-USGov-USDA-NRCS From Illinois Urban Manual http //www il nrcs usda gov NRCS-Illinois Office PD-USGov Environmental engineering Landscape design Water pollution |