GMS is a comprehensive groundwater modeling environment with GIS based graphical preprocessing tools to automate and streamline the modeling process. GMS seamlessly interfaces with MODFLOW and several other preeminent groundwater models, and provides advanced graphical features for viewing and calibrating model results. GMS Features The Groundwater Modeling System (GMS) is a comprehensive graphical user environment for performing groundwater simulations. GMS consists of a graphical user interface (the GMS program) and a number of analysis codes (MODFLOW, MT3DMS, etc.). GMS is used as a preprocessor to graphically create numerical models, and as a post processor to import and visualize model results. GMS uses a Conceptual Modeling Approach to create and manage numerical models using GIS based objects. Other powerful GMS features include 3D Model Conceptualization, Site Visualization, Advanced Geostatistics, Automated Calibration, and Stochastic Modeling. GMS also has advanced tools for Data Import, Data Export and Data Visualization and Animation.