A flood happens when water gets flows and submerges a large portion of land. It usually happens when a river or lake by some means, receives water past the amount it can hold, the said water then escapes the river or lake, and flood the lands wich are near them.
The amount of water a river or lake contains usually varies over the years, depending on the intensity of the winter, but a flood is never declared unless the amount of water that escapes from the place in wich it is conatined is significantly large. Floods are very dangerous when they happen in villages or cities. People could eliminate the danger of floods by living far from water sources such as rivers, but civilization habitates near there sources since the beginning of times, for their usefulness, especially in countries were water is not very abundant, and humans still live in areas threatened by flooding today, wich means the values of having a watersource near the city outweighs the cost of having the risk of flood. Floods not only occur naturally however, if for example a dam breaks down, the large ammount of water that is released is sufficient to flood a village. Floods are very threatening, they cause many casualties especially if they occur during the night, when most of the people are sleeping, they cause damage to buildings, contaminates drinking water, and is a source of water-borne deseases and epidemics. Large floods are very dangerous, however small floods or even larger floods that pose no threat to human civilization can be beneficial, they recharge ground water, fertilize the soil, and are especially useful in arid soils. Floods are usually caused by large storms, cyclones, human intervention (such as dam breakage) and studies connect to effects of global warming to an increased risk of floods.
The risks of floods are very dangerous, they cause a lot of casualties and damage, it can take longer than we think to rebuild a city or village affected by a flood.
Pedro Batim
No comments:
Post a Comment