In this study, scientists used computer models to understand how water flows and contaminants move in an underground water source called Nahavand plain aquifer. They collected data about the area's geology and water levels, then created a 3D model to simulate the water flow. By comparing their model to real data, they found that the water flows from southeast to northwest. They also used a special code to track where contaminants might come from and how they spread in the water.