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A single geodatabase is created to facilitate groundwater modeling with both the Analytic Element Method (AEM) and the Finite Difference method (MODFLOW). The geodatabase schema follows the Arc Hydro data model and furthers the development of the groundwater data model by including objects for use with MLAEM (Multi-Layer Analytic Element Model). The groundwater geodatabase relies upon hydrogeology features common to previous Arc Hydro data models, which are related to modeling objects specific to either MLAEM or MODFLOW. By sharing common hydrogeology features and establishing common features such as boundary conditions, both MLAEM and MODFLOW model inputs are streamlined from ArcGIS feature datasets readily available from FGDC clearinghouses. Additionally, the groundwater geodatabase structure affords efficient creation of inputs for MLAEM using Python Scripts. Groundwater model results from MLAEM are returned to the geodatabase for storage and visualization.