On July 2, 2004 (May 15, 2004 in the lunar calendar), a July 2nd flood occurred in central and southern Taiwan. On July 2, 2004, a July 2 flood occurred in central and southern Taiwan. In recent years, due to global climate changes, abnormal floods have continued to occur, which have been heard from time to time. Although Taiwan is small, it seems that it is difficult to make exceptions. Since Typhoon Herb rained 1960 millimeters for two days in Alishan in 1996, extraordinary concentrated rainfall has continued to occur, causing serious floods. On July 2, 2004, Typhoon Mindooli rotated northward from eastern Taiwan. Although it was invulnerable, it caused severe floods and mudslides in central and southern Taiwan. On September 23, Typhoon Aili entered Fujian from northern Taiwan, and on the second day it dropped heavy rain of more than 1000 millimeters in the Hsinchu area in northern Taiwan. In addition to the loss of life caused by the mudslide disaster, the water turbidity of the Shimen Reservoir, which is the basis for people's livelihood and agricultural and industrial industries in the northern Taoyuan area, surged from 10000 to more than 100000NTU, leaving the Taoyuan area without water for more than half a month, causing severe disaster.