Current Research Rrojects "Developing a guidance document for application of source water capture zones", funded by the Indiana Department of Environmental Management (IDEM (1999 - 2000). Project Manager: Mary Hoover. Two masters students of the Masters of Science in Environmental Science (MSES) of the School of Public and Environmental Affairs at Indiana University carried out research on the application and validity of simple "time of travel" (TOT) capture zone delineation techniques. Admir Ceric developed a dimensionless time parameter, which value forms a decision criterion for using circular or non-circular capture zones. Stijn Hoorens conducted a series of experiments to determine when groups of wells can be treated as one well or when they are sufficiently far apart to treat them as individual non-interfering wells. He also investigated under which conditions nearby hydrogeological boundaries must be taken into account or when they can be ignored. Their study results have been used in the development of a guidance document for the Indiana Department of Environment Management (IDEM). "Investigation of Hydrologic Modeling Needs for the Multimedia Integrated Modeling System", subcontract with Georgia Institute of Technology, PI. Christa Peters-Lidard, for USEPA, 1999-2001. The US EPA is sponsoring the development of a Multi-Media Intergrated Modeling System (MIMS). As part of this effort the atmospheric model MM3 has been coupled with the surface hydrology model TOPLATS. Currently, Professor Christa Peters-Lidard of the Georgia Institute of Technology and Professor Henk Haitjema of the Environmental Science Research Center of Indiana University are preparing a guidance document to couple TOPLATS to a saturated groundwater flow model (MODFLOW 2000 or GFLOW 2000). “Approximate 2D solution for the pumping rate of radial collector wells” funded by R.E. Blattert Consultants (2001 - 2002). Sergey Kuzin, a student of the Masters of Science in Environmental Science (MSES) program of the School of Public and Environmental Affairs at Indiana University assisted (directed research course) in the development of Dupuit-Forchheimer approximations to groundwater flow into horizontal wells, specifically radial collector wells. A conceptual model of horizontal flow or Dupuit-Forchheimer flow replaces the distinctly three-dimensional groundwater flow problem such that the total resistance to flow is preserved, at least approximately. For a given head distribution in the horizontal well or radial collector well, this leads to a two-dimensional representation that results in the same pumping rate as the three-dimensional solution. The 2D representation is simple to implement and is of value for, for instance, the design of these wells (predicting performance) or for capture zone delineation in the context of wellhead protection. The corresponding resistance to flow in the 2D model is obtained by comparing 2D solutions in a vertical section over a horizontal well to a 2D solution in the horizontal plane with entrance resistance added to the (now fully penetrating) horizontal well. The exact solutions in the vertical plane include a horizontal well in a confined aquifer, underneath an equipotential surface and underneath an equipotential surface separated from the aquifer by a thin resistance layer. The exact 2D solutions in the vertical plane and approximate Dupuit-Forchheimer solutions are compared to MODFLOW solutions and field measurements.