What are the causes of floods?

Floods cause huge losses to the population

The first image that comes to mind for most people when it comes to flooding is thedestruction, damage and sometimes death. The city of São Paulo, during the rainy season, always in the news because of flooding. However, this fact is not unique to St. Paul, as many Brazilian cities are facing the same problems. The questions that ariseare: what causes this problem? How to prevent it? This is purely an urban problem?

When the natural bed of a river or stream receives an amount of water from the rain,the greater your capacity it supports them, it overflows, causing the flood. This is anatural process and every river needs an area called the "flood area" where the water will drain. Here it is one of the major problems of flooding and flooding in the cities: the area of flooding in many cities, has not been fulfilled and many people raised theirhouses where the river will naturally overflow and flood the houses.

Another important issue concerns the urbanization of the cities. Most of them, this process took place without any planning, such as thinking the slope of the street(where the rain water will flow) and construct storm sewers (medium used to capture and convey the water from the rain). If these two procedures were used, it is certain that floods and floods do not appear in the news and not cause many social and economic problems.

Floods are a serious problem for society, because besides the enormous economic damage, endanger the lives of several people who may contract infectious diseasessuch as leptospirosis.

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Floods In Japan

It is your impression: it's getting worse. The last decade has focused 50 of 180 major floods in 100 years. Despite having less than other brand disasters, unprecedented rains caused havoc in Rio de Janeiro: 700 dead and 14,000 displaced and homeless.
But nothing comparable to China and India, where population density leads to tragedies with million-plus victims of the destruction, flooding spread infected diseases.
The statistics that point to the increase of the problem has always been viewed with reservation by meteorologists.For them, it takes a long historical sequence to demonstrate a change. For this change began to be proven. For the first time, it was proven that greenhouse gases cause increased rain. That is, there is only getting worse as it is our fault. '' Now we can say with confidence: intesidade increased rainfall in the late 20th century can not be explained by existing climate models'', told Nature magazine researcher Gabriele Hegerl, head of research at the University of Edinburgh, UK . It is only a first step, but there in front may still result in compensation by rich countries by floods in poor regions. At least now science accepts that the weather is