Historical floods are significant water overflow events that have impacted communities throughout time. These floods can result from heavy rainfall, melting snow, or dam failures, leading to widespread destruction and loss of life. Notable examples include the Johnstown Flood of 1889 in the United States and the 1931 China floods, which are among the deadliest in history. Floods have shaped human civilization, prompting the development of flood management systems and policies. They often lead to changes in land use and urban planning, as communities strive to mitigate future risks. Understanding these events helps improve preparedness and response strategies for potential flooding today.