Researchers used a new model to study how water flows underground due to the shape of the land. They found that the amount of rain and how easily water moves through the ground affect how water moves underground. In wet areas with slow water movement, the water table doesn't change much over time. But in drier areas with faster water movement, the water table can go up and down a lot. This information can help us understand how water moves underground and how it interacts with the surface.