There was a long silence, Ishmael staring with unseeing eyes into the distance, seeking that place, Aaron thought, that had no free groundwater.

The south part of the park has been semi-opened park landscape, which ranged from the eastern border of the larger shape of the free groundwater nutritional to the pond.

US Geological Survey water resources homepage - a good place to find free data (for both US surface water and groundwater) and free groundwater modeling software like MODFLOW.