Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The 1931 Central China floods or the Central China floods of 1931 were a series of floods that occurred during the Nanjing decade in the Rupublic of China era. It is generally considered the deadliest natural disaster ever recorded, and almost certainly the deadliest of the 20th century and in China. The human casualties are estimated from 145,000, to between 3.7 million to 4 million.