Natural disasters in China floods and landslides of all times; the top 5 all occurred in China. Estimated deaths in the 1931 China floods range between 2 million and 4 million, listed as the deadliest flood of all times, which is also the deadliest natural disasters of all times. The 1887 Yellow River flood ranked second in death toll in both flood and natural disaster, claiming lives of between 0.9 million to 2 million. The 1938 Yellow River flood was third, with 500,000–700,000 deaths. After a record grain harvest of 466 million metric tons in 1995, another record crop of 475 million metric tons
Flood warning be influenced by a number of factors, which include: A computer system for flood warning will usually contain sub-systems for: The type of flood warning service available varies greatly from country to country, and a location may receive warnings from more than one service. Arrangements for flood warnings vary across the United Kingdom with several agencies leading on warnings for emergency responders and the public. The Environment Agency, Natural Resources Wales and Scottish Environment Protection Agency all undertake location specific flood warning activities for communities at risk depending upon the scale of flood risk, technical challenges and investment needed to