B2 - Efficiency of multi-species riparian buffers in removing nitrate from groundwater: Results from the Bear Creek watershed.

William W. Simpkins, associate professor, Geological and Atmospheric Sciences, Iowa State University; Timothy L. Wineland, Associate Hydrogeologist, MWH Americas, Des Moines, Iowa; Thomas M. Isenhart, Associate Professor, Natural Resources & Ecology Management, Iowa State University; Richard C. Schultz, Professor, Natural Resources & Ecology Management, Iowa State University. The Bear Creek Riparian Management System site has been in existence since 1990 and groundwater quality impacts of multi-species riparian buffers have been monitored since 1996. We present the results of a 2000-01 study of groundwater quality at 6 sites in buffers of differing age. The results suggest large temporal and spatial differences in N removal efficiencies in groundwater in the watershed.

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