Multiple-point Geostatistics for Creation of 3d Hydrostratigraphic Models, Outagamie County, Wi

Three-dimensional hydrostratigraphic models created using multiple-point geostatistics promise to help quantify the role of preferential flow paths in a h eterogeneous glacially-deposited aquitard. The preferential flow paths allow for faster transport of fluids and solutes than in the surrounding matrix. Transport in preferential flow paths is governed by the hydraulic properties within the flow path and connectivity among flow paths. Preferential flow paths are difficult to detect and quantify, especially in aquitards. They may be created by fractures or c onnected bodies of sediment with high hydraulic conductivity (K), such as sand within a clay matrix. Even thick aquitards (greater than 150 ft) may have fractures that are cap able of transporting contaminants (Cherry et al., 2006; Gerber et al., 2001). F ew researchers have documented preferential flow paths created by connected sand bodies. Techniques to delineate preferential flow paths in aquitards are key to protecting underlying aquifers.