What is a flood ? Explain the causes of flood and its destruction.
Answers
Explanation:
Lake and Coastal flooding occurs when large storms or tsunamis causes the water body to surge inland. These overflows have destructive power since they can destroy ill-equipped structures to withstand water's strength such as bridges, houses, and cars.
its cause are. ..
- Flooding occurs most commonly from heavy rainfall when natural watercourses do not have the capacity to carry excess water.
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.
At least once a year the plains around large rivers are flooded. This is due to the amount of water that rivers bring with them, because of heavy rainfall or melting snow in the mountainous regions. Thunderstorms can cause flash floods, in which small rivers can swell quickly and carry up to ten times the normal amount of water.
Rivers that flow slowly carry water, sand and silt. They build up their own beds, making them higher than the land around them. The Huang He, or Yellow River, in China and the Mississippi in North America are examples for such rivers. Flooding here builds up slowly but causes more damage because more land is affected.
Coastal regions can also be affected by flooding. After earthquakes on the ocean floor tsunamis can bring up to 15-metre high waves and flood the coast many miles inland. In 2004, a devastating tsunami in the Indian Ocean killed over 250,000 people in Indonesia, Sri Lanka, Thailand and other countries.
Tropical storms, cyclones and hurricanes also lead to flooding. Hurricane Katrina caused a massive flooding of the whole Mississippi Delta in 2004. Most of New Orleans had to be evacuated because of widespread flooding.
Low-lying countries are in permanent danger of being flooded. A large section of The Netherlands, for example, lie below sea level. In the past, ocean water from the North Sea flooded much of the country. Today a series of dikes and dams protect the land behind the coast.
Floods are also caused by humans. Trees and plants normally help absorb too much water. When forests are cut or burned down, water from rainfall flows down barren land and produces mudslides. Too much water pressure on dams can lead to cracks in the concrete or even cause a dam to break completely.