Xiao, Q., McPherson, E. G. 2011. Performance of engineered soil and trees in a parking lot bioswale.  Urban Water Journal. Taylor & Francis Group. Volume 8, Number 4. Pages 241-253 BMP, pollutant, Pollution Prevention, Practice, runoff, urban, Stormwater, Soil, Swales, Trees https://www.fs.usda.gov/treesearch/pubs/38807 This study assess the efficacy of a parking lot bioswale with engineered soil media and an adjacent tree (at the University of California, Davis, USA) in runoff and pollutant loading reduction .