Cedar Rapids is the hardest hit area in Aizhou, with a total population of 1.24 million. On June 5438+02, the flood overflowed a local levee, forcing a hospital 176 patients to move urgently. Floods flooded into the city, and more than 3,000 residents of Cedar Rapids left their homes and fled to high places for safety. At least 438 houses were flooded.
Chet Culver, governor of Aizhou, announced on the same day that 83 of the 99 counties in the state had entered a state of disaster; The water levels of nine major rivers exceeded the highest level in history. According to preliminary estimates, the losses caused by this disaster in Aizhou are as high as several billion dollars.
Brett Voorhees, spokesman for the State Department of Homeland Security and Emergency Affairs, said that the flood response in Aizhou has been going on for 10 days. We think this is a flood once in 500 years.
David Cozzi, spokesman of Cedar Rapids Fire Department, predicted that the water level of Cedar River, a tributary of the Mississippi River, would peak at 13, which would be the highest since 157.
There is a drinking water emergency in Cedar Rapids. There are six or seven wells in the city, and now only one can be used.
People piled sandbags near wells to resist floods and used machines to pump clean water from wells. "If we can't even use this well, we will be in trouble." Cozi said.
At the same time, about 5,500 citizens in Cedar Rapids were caught in a power outage crisis. The power company claims that it is trying its best to protect the power facilities from further damage. These citizens may have to live in the dark for about 1 week.
The location of the flood happened to be an important soybean and corn producing area in the United States. Affected by the disaster, the futures prices of these two agricultural products rose, adding to the already tense international grain market.
The Associated Press said that corn futures for July delivery on the Chicago Board of Trade rose to $7.09 per bushel on June 3, while soybean futures for July delivery closed at $65,438+$05.365 per bushel.
What is a waterlogging disaster?
What is a waterlogging disaster? Waterlogging disaster refers to the disaster of agricultural production reduction due to excessive local precipitation, surface runoff can not be eliminated in time, and farmland water accumulation exceeds the flood resistance of crops. The reason of crop yield reduction is that the depth of accumulated water is too large and the time is too long, so that the air in the soil is discharged one after another, which leads to insufficient oxygen in the roots of crops, difficulty in breathing in the roots, and the production of toxic and harmful substances such as ethanol, which affects crop growth and even causes crop death.
Classification of waterlogging disasters:
Flood: Flood disasters can be divided into flood, waterlogging and wet damage.
Flooding: Torrential rain and torrential rain caused flash floods, river flooding, flooded farmland and destroyed agricultural facilities.
Waterlogging: Too much or too concentrated rain or too much backwater causes farmland waterlogging.
Wet damage: after the flood disaster, poor drainage makes the soil water saturated for a long time, and the crop roots are deprived of oxygen, causing disasters.
Flood disaster: mainly occurred in the middle and lower reaches of the Yangtze River, Yellow River, Huaihe River and Haihe River.
Flood disaster: it can happen all year round.
Spring waterlogging: mainly occurs in South China, the middle and lower reaches of the Yangtze River and coastal areas.
Summer waterlogging: The main waterlogging disasters in China mainly occur in the Yangtze River basin, the southeast coast and the Huanghuai Plain.
Autumn waterlogging: mostly caused by typhoon and rain, mainly occurring in the southeast coast and South China.
Flood disaster has dual attributes, both natural and socio-economic attributes. Its formation must meet two conditions: ① natural conditions. Flood is the direct cause of flood disaster. Only when the natural variation intensity of flood reaches a certain standard will disasters occur. The main influencing factors are geographical location, climatic conditions and topography. ② Socio-economic conditions. Floods will only occur where there are human activities, which will cause disasters. The areas most threatened by floods are often the middle and lower reaches of rivers, which are often economically developed areas because of their rich water resources and flat land.
From the mechanism of flood disaster, flood has obvious seasonality, regionality and repeatability. For example, almost all floods in the middle and lower reaches of the Yangtze River in China occur in summer, and the causes are basically the same, but they have different characteristics in the Yellow River basin.
At the same time, flood disasters are very destructive and universal. Flood disaster not only harms society, but also seriously harms adjacent river basins, causing changes in water system. In addition, floods may occur in different areas, including mountainous areas, coastal areas, river estuaries, middle and lower reaches of rivers and areas around glaciers.
Floods are still defensive. It is impossible for mankind to completely eradicate the flood disaster, but through various efforts, the impact of the disaster can be minimized as much as possible.