causes of flood, effects and precution
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Answer:
River flooding: River flooding occurs when heavy rains or rapid snow-meltcause rivers to rise. Coastal flooding: Coastal flooding may occur due to tidal surges and flash flooding. Flashfloods: Flash floods usually result from intense storms which release large amounts of rain within a brief period.
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Answer:
A flood is a body of water that covers land which is normally dry. Floods are common natural disasters that can affect millions of people around the world. They destroy houses and buildings, and carry soil away from valuable farming land. Floods can also contaminate drinking water and lead to diseases. They are often caused by rivers, but overflowing lakes and seas can also cause flooding.
Flooding has always been a part human history. Many ancient civilizations developed along waterways and rivers because people needed water for their fields.
Floods are not always destructive natural events. Before the Assuan High Dam was built yearly floods in Egypt brought along nutrients and made the land around the Nile very fertile. Every year floods during the monsoon season in Bangladesh deposit fertile soil but also kill thousands of people and leave millions homeless.
Today flood protection has a high priority in countries that are in danger. Dams are built along rivers to regulate the flow of water. They are often connected with hydroelectric power plants. In some areas rivers are dredged and their beds are laid deeper. In alpine regions reservoirs are built to hold back water and control the flow of small rivers.
London is protected from flooding by the Thames Barrier, a construction that moves up and stops water from getting in to London when it reaches a certain height.
In many areas, authorities provide quick and unbureaucratic help for people who have suffered from flooding. Special boats pick up people who are trapped on roofs or on the upper floors of buildings. Shelters are set up for people who are left homeless. Rebuilding after massive floods often takes months and sometimes even years.