Groundwater recharge in karst areas is important for water resources but hard to study. This research used cave monitoring to understand how water moves through the ground. They found two types of flow: slow and fast. The fast flow happens when water quickly moves through the ground, while the slow flow occurs in less permeable areas. Rainfall intensity affects how fast water moves through the ground. By using computer models, scientists can better understand how water recharges karst aquifers.