Why did the spring water skyrocket?

There are fertile fields in front of Baishabao Village, named Penglong Upper Cave and Penglong Lower Cave. There are two sweet springs here, which don't dry up all year round and are clear all year round, named Qinglong Spring and Huanglong Spring. The villagers have been irrigated by these two springs for generations, and the population in the village is prosperous and the grain is abundant. Because Baishabao is surrounded by mountains, the origin and development of the spring water is not clear, only that the launching site flows into the underground river through the cave and then into the old county river behind the mountain. According to the old man Nakamura, the water rose once on March 17 (1868) and lasted for 4 days. In the 29th year of the Republic of China (1940), on June 17th, a rising tide lifts all boats. The weather was fine that day, and water suddenly appeared in the cave. In an instant, the water rose to a depth of 1 m, and the villages and fields were covered by Wang Yang. But the water in the river in the old county is still the same as before. There is no sign of rising water. At that time, it was at the beginning of the early rice ripening season, and the elderly and experienced villagers knew that the flood would not subside in a short time, which made the villagers scramble to cut rice. The incident was a sensation, and people from all over the country came to watch the flood in an endless stream.