Flood is an overflow of an expanse of water that submerges land. Flood is one of natural disaster generally happened in most of the world. It can be destructive and harm to human life.
Flooding may result from the volume of water within a body of water such as a river, lake, or ocean. Raining in high intensity and continually along day is the major case of flooding cause. Regions that have two seasons (near the equator) tend to have raining longer than regions which have four seasons (about six months). Even, a phenomenon known as La-Niña can make raining longer and torrential than usual. That means probability of flood increases too.
Besides, soil density also influences the incident of flood. Water from the rain can’t be absorbed perfectly by the soil. While this happens, the depth of water above the surface will higher and higher. Then it drowns the surrounding area: office, houses, school, rice field, etc. Flood like this often occur in urban areas.
Flood can damage any type of stucture, including bridges, cars, buildings, and roadway; contaminate water, so that clean drinking water becomes scarce; causes food supplies shortage, it can be caused by loss of entire harvest; in the end, it causes economic hardship, due to: temporary decline in tourism, rebuilding costs, food shortage leading to price increase, etc.
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