Xin lỗi bạn vì bây giờ mình mới trả lời. What causes flooding? Rains: Each time there are more rains than the drainage system can take, there can be floods. In other times, there may be light rain for many days and weeks and can also result in floods. River overflow: This happens when there is more water upstream than usual, and as it flows downstream to the adjacent low-lying areas (also called a floodplain), there is a burst and water gets into the land. Strong winds in coastal areas: Sea water can be carried by massive winds and hurricanes onto dry coastal lands and cause flooding. Sometimes water from the sea resulting from a tsunami can flow inland to cause damage. Ice and snow-melts: In many cold regions, heavy snow over the winter usually stays un-melted for sometime. Sometimes the ice suddenly melts when the temperature rises, resulting in massive movement of water into places that are usually dry. Effects of flooding Economic: During floods (especially flash floods), roads, bridges, farms, houses and automobiles are destroyed. People become homeless. Environment: The environment also suffers when floods happen. Chemicals and other hazardous substances end up in the water and eventually contaminate the water bodies that floods end up in. People and animals: Many people and animals have died in flash floods. Many more are injured and others made homeless. Preventing floods Town planning: It is important that builders acquire permission before buildings are erected. This will ensure that waterways are not blocked. Drainage systems should also be covered to prevent litter from getting into them. Education: Education is very important, to inform and caution people about the dangers of floods, what causes floods, and what can be done to minimise its impact.
Nguồn: eschooltoday.com
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