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Modeling Preferential Flow and Risk of Biosolid Contamination to Tile Drains Using a Dual Porosity Model

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  042238,  2004 ASAE Annual Meeting . (doi: 10.13031/2013.16431) @2004
Authors:   Nurul A. Akhand, David R. Lapen, Edward Topp, Mark J. Edwards, Robert C. Roy, Bonnie R. Ball Coelho, Lyne Sabourin, Peter W. Duenk, Michael Payne
Keywords:   Preferential flow, macroporosity, biosolids, dual porosity, tile drain

With increasing application of liquid municipal biosolids (LMB) on farm lands, a better understanding of the transport mechanisms by which contaminants reach water sources is required. For this purpose, a onedimensional transport model, MACRO, was used to understand soil water transport mechanisms under macroporous soils. Field measured data were used for calibration purposes. The model predicted that macropore flow dominated tile flow; bacteria transport was also found to be predominately macropore driven. Modeling helped to elucidate: the LMB application rates that reduce the risk of application induced macropore flow of LMB to tiles, the surface soil water contents required to minimize application induced tile contamination from LMB, and tile discharge contributing area. Although cursory at this stage, this modeling exercise was found to be promising with respect to providing information that can be used towards the development of Best Management Practices (BMPs) for land application of LMB.