The study looked at how water moves through soil slopes during rainfall. By creating a mathematical model and using theories of water flow in soil, the researchers simulated how water pressure changes over time and space in the soil layers. They found that as rainfall continues, water pressure in the soil layers increases, especially at the bottom of the slope. The water pressure also rises as time goes on, but decreases as you move horizontally along the slope. Overall, the soil layers reach their maximum water storage capacity as rainfall continues.