Volume I. Preface. Organizing Committees. Unsaturated Flow. General Groundwater. Multiphase Flow Modeling and Experiments. Numerical Methods for Multiphase Flow. Fractured Media. Numerical Methods for Subsurface Processes. Density Dependent Flow and Transport. Modeling Reactive Solute Transport. Coupled Flow and Reactive Transport in Groundwater. Analytical Element Method. Water Resources Management. Remediation Methods and Biodegradation. Author Index. Volume II. Preface. Organizing Committees. Mathematical and Numerical Modeling for Subsurface and Surface Problems. Eulerian - Lagrangian Methods (ELLAM). Pore Scaline Modeling. Upscaling. Stochastic Modeling. Data Assimilation. Optimization. Ecohydrology. Surface Water - Groundwater Interactions. Watershed Modeling. Shallow Water Modeling. Rivers, Channels and Overland Flow. Surface Water Transport and Quality. Precipitation. Computational Methods in the Classroom. Late Paper. Author Index.