The study looked at how rainfall affects erosion and water movement on slopes with red soil. They used simulated rainfall in a lab to mimic real conditions. They found that runoff started faster without interflow, but interflow lagged behind. Runoff intensity was lower without interflow. Sediment yields were lower without interflow, except for peak values. Water infiltration was faster without interflow. Water content decreased near the surface and increased deeper without interflow, while with interflow, it decreased near the surface and increased deeper. Water content was higher below 5 cm without interflow. Water content changes were more consistent without interflow and varied more at 15-30 cm depth.